ITIS - Taxon Author Search Results: "Britton"

Integrated Taxonomic Information System - Taxon Author Search Results
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Taxon author: Britton

ITIS records citing taxon author "Britton"


Kingdom Animalia
	Hyphalinae Britton, 1971 -- valid
	Hyphalus Britton, 1971 -- valid
	Hyphalus insularis Britton, 1971 -- valid
	Hyphalus kuscheli Britton, 1977 -- valid
	Hyphalus prolixus Britton, 1977 -- valid
	Hyphalus ultimus Britton, 1977 -- valid
	Hyphalus wisei Britton, 1973 -- valid
	Lemodinae Lawrence and Britton, 1991 -- valid
	Mecyclothorax ater Britton, 1948 -- valid
	Mecyclothorax exilis Britton, 1948 -- valid
	Mecyclothorax flavomarginatus Britton, 1948 -- valid
	Mecyclothorax incompositus Britton, 1948 -- valid
	Mecyclothorax irregularis Britton, 1948 -- valid
	Mecyclothorax lahainae Britton, 1948 -- valid
	Mecyclothorax minor Britton, 1948 -- valid
	Mecyclothorax paravus Britton, 1948 -- invalid
	Mecyclothorax parvus Britton, 1948 -- valid
	Mecyclothorax proximus Britton, 1948 -- valid
	Mecyclothorax quadratus Britton, 1948 -- valid
	Mecyclothorax sharpi Britton, 1948 -- valid
	Mecyclothorax tantalus Britton, 1948 -- valid
	Mecyclothorax variipes Britton, 1948 -- valid
	Mecyclothorax varipes Britton, 1948 -- invalid
	Myraboliidae Lawrence and Britton, 1991 -- valid
	Tasmosalpingidae Lawrence and Britton, 1991 -- valid

Kingdom Plantae
	Acacia anegadensis Britton -- not accepted -- blackbrush wattle
	Acacia angustissima var. shrevei (Britton & Rose) Isely -- accepted -- Shreve prairie acacia, Shreve's prairie acacia
	Acaciella hirta (Nutt.) Britton & Rose -- not accepted
	Acaciella shrevei Britton & Rose -- not accepted
	Acaciopsis Britton & Rose -- not accepted
	Acaciopsis rigidula (Benth.) Britton & Rose -- not accepted
	Acanthocereus (Engelm. ex A. Berger) Britton & Rose -- accepted -- triangle cactus
	Acanthocereus albicaulis Britton & Rose -- not accepted
	Acanthocereus colombianus Britton & Rose -- not accepted
	Acanthocereus floridanus Small ex Britton & Rose -- not accepted
	Acanthocereus horridus Britton & Rose -- not accepted
	Acanthocereus occidentalis Britton & Rose -- not accepted
	Acanthocereus pentagonus (L.) Britton & Rose -- not accepted
	Acanthocereus subinermis Britton & Rose -- not accepted
	Acanthorhipsalis (K. Schum.) Britton & Rose -- not accepted
	Acer interius Britton -- not accepted
	Acer negundo ssp. interius (Britton) �. L�ve & D. L�ve -- not accepted
	Acer negundo var. interius (Britton) Sarg. -- accepted -- ash-leaf maple, boxelder, boxelder maple
	Acer saccharum var. nigrum (F. Michx.) Britton -- not accepted
	Acer stenocarpum Britton -- not accepted
	Acerates viridiflora var. ivesii Britton -- not accepted
	Achimenes gracilis Britton ex Rusby -- not accepted
	Achimenes rusbyi Britton ex Rusby -- not accepted
	Achimenes tubiflora (Hook.) Britton -- not accepted
	Achyranthes peploides (Humb. & Bonpl. ex Schult.) Britton & P. Wilson -- not accepted
	Acisanthera acisanthera (L.) Britton -- not accepted
	Acmispon americanus var. helleri (Britton) Brouillet -- accepted -- Heller's bird's-foot trefoil
	Acmispon helleri (Britton) A. Heller -- not accepted
	Acmispon mearnsii (Britton) Brouillet -- accepted -- Mearns' bird's-foot trefoil
	Acmispon mearnsii var. mearnsii (Britton) Brouillet -- accepted -- Mearns' bird's-foot trefoil
	Adenorachis atropurpurea (Britton) Nieuwl. -- not accepted
	Adenoropium hastatum (Jacq.) Britton & P. Wilson -- not accepted
	Adipera bicapsularis (L.) Britton & Rose ex Britton & P. Wilson -- not accepted
	Adipera corymbosa (Lam.) Britton & Rose -- not accepted
	Adipera laevigata (Willd.) Britton & Rose ex Britton & P. Wilson -- not accepted
	Adipera stahlii (Urb.) Britton & Rose ex Britton & P. Wilson -- not accepted
	Adlumia fungosa (Aiton) Greene ex Britton, Sterns & Poggenb. -- accepted -- Allegheny vine, climbing fumitory, mountain-fringe
	Aeschynomene virginica (L.) Britton, Sterns & Poggenb. -- accepted -- northern jointvetch, sensitive joint-vetch, Virginia jointvetch
	Agalinis aspera (Douglas ex Benth.) Britton -- accepted -- rough foxglove, tall false foxglove
	Agalinis besseyana (Britton) Britton -- not accepted
	Agalinis linifolia (Nutt.) Britton -- accepted -- flaxleaf false foxglove
	Agalinis parvifolia (Chapm.) Small ex Britton -- not accepted
	Agalinis paupercula (A. Gray) Britton -- not accepted -- smallflower false foxglove
	Agalinis paupercula var. paupercula (A. Gray) Britton -- not accepted -- smallflower false foxglove
	Agalinis skinneriana (Alph. Wood) Britton -- accepted -- Skinner's false foxglove
	Agastache anethiodora (Nutt.) Britton -- not accepted
	Agrimonia mollis (Torr. & A. Gray) Britton -- not accepted
	Agrostis hiemalis (Walter) Britton, Sterns & Poggenb. -- not accepted
	Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. -- accepted -- winter bentgrass
	Agrostis hyemalis var. hyemalis (Walter) Britton, Sterns & Poggenb. -- not accepted
	Aklema petiolaris (Sims) Millsp. ex Britton -- not accepted
	Albizia adinocephala (Donn. Sm.) Britton & Rose ex Record -- accepted -- cream albizia
	Albizia carbonaria Britton -- accepted -- naked albizia
	Alliaria alliaria (L.) Britton -- not accepted
	Alloplectus bolivianus (Britton ex Rusby) Wiehler -- not accepted
	Alloplectus grandifolius Britton ex Rusby -- not accepted
	Alnus alnus (L.) Britton -- not accepted
	Alnus noveboracensis Britton -- not accepted
	Aloysia triphylla (L'H�r.) Britton -- not accepted -- lemon beebrush
	Alsinanthe stricta ssp. dawsonensis (Britton) �. L�ve & D. L�ve -- not accepted
	Alsine antillana (Urb.) Britton & P. Wilson -- not accepted
	Alsine aquatica (L.) Britton -- not accepted
	Alsine borealis (Bigelow) Britton -- not accepted
	Alsine crassifolia (Ehrh.) Britton -- not accepted
	Alsine fontinalis (Short & Peter) Britton -- not accepted
	Alsine glauca (With.) Britton -- not accepted
	Alsine graminea (L.) Britton -- not accepted
	Alsine holostea (L.) Britton -- not accepted
	Alsine humifusa (Rottb.) Britton -- not accepted
	Alsine longifolia (Muhl. ex Willd.) Britton -- not accepted
	Alsine pubera (Michx.) Britton -- not accepted
	Alsine uliginosa (Murray) Britton -- not accepted
	Amelanchier alabamensis Britton -- not accepted
	Amelanchier arborea var. alabamensis (Britton) G.N. Jones -- not accepted -- Alabama serviceberry
	Amelanchier canadensis var. obovalis (Michx.) Britton, Sterns & Poggenb. -- accepted -- coastal serviceberry
	Amerosedum leibergii (Britton) �. L�ve & D. L�ve -- not accepted
	Ammannia koehnei Britton -- not accepted
	Amomis grisea (Kiaersk.) Britton -- not accepted
	Ampelamus albidus (Nutt.) Britton -- not accepted -- honeyvine milkweed
	Amphiglottis anceps (Jacq.) Britton -- not accepted
	Amphiglottis corymbosa auct. non (Lindl.) Britton -- not accepted
	Amphiglottis difformis auct. non (Jacq.) Britton -- not accepted
	Amphiglottis lacera (Lindl.) Britton -- not accepted
	Amphiglottis nocturna (Jacq.) Britton -- not accepted
	Amphiglottis pallidiflora (Hook.) Britton -- not accepted
	Amsonia amsonia (L.) Britton -- not accepted
	Anamomis dicrana (O. Berg) Britton -- not accepted
	Anamomis umbellulifera (Kunth) Britton -- not accepted
	Ancistrocactus (K. Schum.) Britton & Rose -- not accepted
	Ancistrocactus brevihamatus (Engelm.) Britton & Rose -- not accepted
	Ancistrocactus megarrhizus (Rose) Britton & Rose -- not accepted
	Ancistrocactus scheeri (Salm-Dyck) Britton & Rose -- not accepted
	Andrachne cuneifolia Britton -- not accepted
	Andropogon glomeratus (Walter) Britton, Sterns & Poggenb. -- accepted -- bushy bluestem
	Andropogon glomeratus var. glomeratus (Walter) Britton, Sterns & Poggenb. -- accepted -- bushy bluestem
	Anemone decapetala var. heterophylla (Torr. & A. Gray) Britton & Rusby -- not accepted
	Anemone lyallii Britton -- accepted -- Little Mountain thimbleweed
	Anemone multifida var. tetonensis (Porter ex Britton) C.L. Hitchc. -- accepted -- Pacific anemone
	Anemone nemorosa var. lyalli (Britton) Ulbr. -- not accepted
	Anemone nemorosa var. lyallii (Britton) Ulbr. -- not accepted
	Anemone piperi Britton ex Rydb. -- accepted -- Piper's anemone
	Anemone quinquefolia var. lyallii (Britton) B.L. Rob. -- not accepted
	Anemone quinquifolia var. lyallii (Britton) B.L. Rob. -- not accepted
	Anemone tetonensis Porter ex Britton -- not accepted -- Teton anemone
	Angelica villosa (Walter) Britton, Sterns & Poggenb. -- not accepted
	Anguria cookiana Britton -- not accepted
	Anneslea haematostoma (Bertero ex DC.) Britton -- not accepted
	Anneslea portoricensis (Jacq.) Britton -- not accepted
	Anneslea purpurea (L.) Britton -- not accepted
	Anneslia haematomma (Bertero ex DC.) Britton -- not accepted
	Anneslia portoricensis (Jacq.) Britton -- not accepted
	Anneslia purpurea (L.) Britton -- not accepted
	Anogra albicaulis (Pursh) Britton -- not accepted
	Anogra coronopifolia (Torr. & A. Gray) Britton -- not accepted
	Antigonon macrocarpum Britton & Small -- not accepted
	Antirhea portoricensis (Britton & P. Wilson) Standl. -- not accepted -- Puerto Rico quina, quina
	Anychia canadensis (L.) Britton, Sterns & Poggenb. -- not accepted
	Apargia nudicaulis (L.) Britton -- not accepted
	Apocynum milleri Britton -- not accepted
	Aporocactus conzattii Britton & Rose -- not accepted
	Aporocactus leptophis (DC.) Britton & Rose -- not accepted
	Aporocactus martianus Britton & Rose -- not accepted
	Arabidopsis novae-angliae (Rydb.) Britton -- not accepted
	Arabis brachycarpa (Torr. & A. Gray) Britton -- not accepted
	Arbuscula leibergii (E. Britton) H.A. Crum, Steere & L.E. Anderson -- not accepted
	Ardisia luquillensis (Britton) Alain -- accepted -- mountain marlberry
	Arenaria dawsonensis Britton -- not accepted
	Arenaria stricta ssp. dawsonensis (Britton) Maguire -- not accepted
	Arenaria stricta var. dawsonensis (Britton) Scoggan -- not accepted
	Arenaria texana (B.L. Rob.) Britton -- not accepted
	Arequipa Britton & Rose -- not accepted
	Arisaema atrorubens var. stewardsonii (Britton) G.T. Stevens -- not accepted
	Arisaema stewardsonii Britton -- not accepted
	Arisaema triphyllum ssp. stewardsonii (Britton) Huttl. -- not accepted -- Jack in the pulpit
	Arisaema triphyllum var. stewardsonii (Britton) G. T. Stevens ex Wieg. & Eames -- not accepted
	Armatocereus cartwrightianus (Britton & Rose) Backeb. -- accepted
	Armatocereus godingianus (Britton & Rose) Backeb. -- accepted
	Armatocereus godingianus ssp. godingianus (Britton & Rose) Backeb. -- accepted
	Armatocereus humilis (Britton & Rose) Backeb. -- not accepted
	Armatocereus laetus (Britton & Rose) Backeb. -- accepted
	Armoracia armoracia (L.) Britton -- not accepted
	Arnica acaulis (Walter) Britton, Sterns & Poggenb. -- accepted -- common leopardbane
	Aronia arbutifolia var. atropurpurea (Britton) Seymour -- not accepted
	Aronia atropurpurea Britton -- not accepted
	Arrojadoa Britton & Rose -- accepted
	Arrojadoa penicillata (G�rke) Britton & Rose -- accepted
	Arrojadoa rhodantha (G�rke) Britton & Rose -- accepted
	Artemisia kansana Britton -- not accepted
	Asclepias rolfsii Britton ex Vail -- not accepted
	Asclepias tuberosa ssp. rolfsii (Britton ex Vail) Woodson -- accepted -- Rolfs' milkweed
	Asplenium platyneuron (L.) Britton, Sterns & Poggenb. -- accepted -- doradille �b�ne, ebony spleenwort
	Asplenium platyneuron var. platyneuron (L.) Britton, Sterns & Poggenb. -- not accepted -- ebony spleenwort
	Aster bracei Britton ex Small -- not accepted -- Brace's aster
	Aster cordifolius var. incisus Britton -- not accepted
	Aster kentuckiensis Britton -- not accepted
	Aster lateriflorus (L.) Britton -- not accepted -- calico aster
	Aster lowrieanus var. incisus (Britton) Porter -- not accepted
	Aster missouriensis Britton non Kuntze -- not accepted
	Aster nebraskensis Britton -- not accepted
	Aster pilosus var. priceae (Britton) Cronquist -- not accepted -- white oldfield aster
	Aster praealtus var. nebraskensis (Britton) Wiegand -- not accepted -- Nebraska aster
	Aster priceae Britton -- not accepted
	Aster pringlei (A. Gray) Britton -- not accepted
	Asterandra grandifolia (L.) Britton -- not accepted
	Astilbe biternata (Vent.) Britton ex Kearney -- accepted -- Appalachian false goat's beard
	Astilbe crenatiloba (Britton) Small -- not accepted -- Roan Mountain false goat's beard
	Astragalus jesupii (Eggl. & E. Sheld.) Britton -- not accepted
	Astrophytum capricorne (A. Dietr.) Britton & Rose -- accepted
	Astrophytum ornatum (DC.) Britton & Rose -- accepted
	Atamosco tubispatha Britton & P. Wilson, non (L'H�r.) M. G�mez -- not accepted
	Audibertia mearnsii Britton -- not accepted
	Austrocactus Britton & Rose -- accepted
	Austrocactus bertinii (Cels ex H�rincq) Britton & Rose -- accepted
	Austrocylindropuntia shaferi (Britton & Rose) Backeb. -- accepted
	Baccharis neglecta Britton -- accepted -- Roosevelt-weed, Rooseveltweed
	Badiera portoricensis Britton -- not accepted
	Bahia dissecta (A. Gray) Britton -- not accepted -- ragleaf bahia
	Bartonia virginica (L.) Britton, Sterns & Poggenb. -- accepted -- bartonie de Virginie, yellow screwstem
	Batocydia unguis (L.) Mart. ex Britton -- not accepted
	Batocydia unguis-cati (L.) Mart. ex Britton -- not accepted
	Batrachium porteri (Britton) Britton -- not accepted
	Bauhinia congesta (Britton & Rose) Lundell -- not accepted
	Bauhinia jermyana (Britton) Lundell -- not accepted
	Bergerocactus Britton & Rose -- accepted -- snakecactus
	Bergerocactus emoryi (Engelm.) Britton & Rose -- accepted -- golden snakecactus, �rgano aterciopelado
	Bergerocereus emoryi (Engelm.) Britton & Rose -- not accepted
	Besleria longipedunculata Britton ex Rusby -- accepted
	Besleria montana Britton ex Rusby -- accepted
	Besleria sprucei Britton ex Rusby -- accepted
	Betula alleghaniensis Britton -- accepted -- yellow birch
	Betula alleghaniensis var. alleghaniensis Britton -- not accepted -- yellow birch
	Betula ersinifera Britton -- not accepted
	Betula piperi Britton -- not accepted
	Betula resinifera Britton -- not accepted
	Betula X sandbergii Britton -- accepted -- Sandberg's birch
	Betula X utahensis Britton (pro sp.) -- accepted -- northwestern paper birch
	Bidens acuta (Wiegand) Britton -- not accepted
	Bidens aristosa (Michx.) Britton -- accepted -- bearded beggarticks, long-bracted beggar-ticks, tickseed sunflower
	Bidens bidentoides (Nutt.) Britton -- accepted -- Delmarva beggarticks
	Bidens coronata (L.) Britton -- not accepted -- crowned beggarticks
	Bidens discoidea (Torr. & A. Gray) Britton -- accepted -- discoid beggarticks, small beggarticks, swamp beggar-ticks
	Bidens involucrata (Nutt.) Britton -- not accepted
	Bidens laevis (L.) Britton, Sterns & Poggenb. -- accepted -- bur marigold, smooth beggarticks
	Bidens trichosperma (Michx.) Britton -- accepted -- crowned beggarticks
	Boebera papposa (Vent.) Rydb. ex Britton -- not accepted
	Bolboschoenus novae-angliae (Britton) S.G. Sm. -- accepted -- New England bulrush
	Borrichia X cubana Britton & S.F. Blake (pro sp.) -- accepted -- Cuban borrichia
	Borzicactus acanthurus (Vaupel) Britton & Rose -- not accepted
	Borzicactus aurivillus (K. Schum.) Britton & Rose -- not accepted
	Borzicactus decumbens (Vaupel) Britton & Rose -- not accepted
	Borzicactus fieldianus Britton & Rose -- not accepted
	Borzicactus icosagonus (Kunth) Britton & Rose -- not accepted
	Borzicactus morleyanus Britton & Rose -- not accepted
	Borzicactus plagiostoma (Vaupel) Britton & Rose -- not accepted
	Borzicactus sepium (Kunth) Britton & Rose -- not accepted
	Bouchetia anomala (Miers) Britton & Rusby -- accepted
	Brachelyma robustum (Cardot) E. Britton -- not accepted
	Brachyactis angusta (Lindl.) Britton -- not accepted
	Brachycereus Britton & Rose -- accepted
	Brachychaeta sphacelata (Raf.) Britton -- not accepted
	Brachydontium olympicum (E. Britton) T.T. McIntosh & J.R. Spence -- accepted -- Olympic brachydontium moss
	Bradburya floridana Britton -- not accepted
	Bramia rotundifolia (Michx.) Britton -- not accepted
	Brasiliopuntia bahiensis (Britton & Rose) A. Berger -- not accepted
	Brauneria pallida (Nutt.) Britton -- not accepted
	Brauneria purpurea (L.) Britton -- not accepted
	Browningia Britton & Rose -- accepted
	Browningia candelaris (Meyen) Britton & Rose -- accepted
	Browningia candelaris ssp. candelaris (Meyen) Britton & Rose -- accepted
	Bruchia drummnondii Hampe ex E. Britton -- not accepted
	Bruchia drummondii Hampe ex E. Britton -- accepted -- Drummond's bruchia moss
	Bruchia fusca E. Britton -- accepted
	Brysonima horneana Britton & Small -- not accepted
	Brysonima X ophiticola Small ex Britton -- not accepted
	Bulbostylis antillana (Britton) Fernald -- not accepted
	Bulbostylis capillaris ssp. antillana (Britton) T. Koyama -- not accepted -- densetuft hairsedge
	Bulbostylis curassavica (Britton) K�k. ex Ekman -- accepted -- West Indian hairsedge
	Bursa bursa-pastoris (L.) Britton -- not accepted
	Byrsonima horneana Britton & Small -- not accepted
	Byrsonima X ophiticola Small ex Britton -- accepted
	Cabomba piauhyensis sensu Britton & P. Wilson and sensu Alain, non Gardner -- not accepted
	Caconapea stricta (Schrad.) Britton -- not accepted
	Cactus broadwayi Britton & Rose -- not accepted
	Caesalpinia clementis (Britton) Leon -- not accepted
	Caesalpinia culebrae (Britton & P. Wilson) Alain -- not accepted -- amarillo mato, smooth yellow nicker
	Caesalpinia monensis Britton -- accepted -- black nicker, negro mato
	Caesalpinia myabensis Britton -- not accepted
	Caesalpinia peninsularis (Britton) Eifert -- not accepted -- peninsular holdback
	Caesalpinia portoricensis (Britton & P. Wilson) Alain -- not accepted -- brown mato, brown nicker
	Caesalpinia pumila (Britton & Rose) F.J. Herm. -- accepted
	Caesalpinia wootonii (Britton) Eifert ex Isely -- not accepted -- Wooton's holdback
	Calophyllum antillanum Britton -- not accepted -- Alexandrian laurel, Antilles calophyllum, mast wood, Santa Maria
	Calophyllum brasiliense var. antillanum (Britton) Standl. -- not accepted
	Calopogon tuberosus (L.) Britton, Sterns & Poggenb. -- accepted -- tuberous grasspink
	Calopogon tuberosus var. tuberosus (L.) Britton, Sterns & Poggenb. -- accepted -- tuberous grasspink
	Calyptracordia alba auct. non (Jacq.) Britton -- not accepted
	Calyptracordia alba (Jacq.) Britton -- not accepted
	Calyptranthes portoricensis Britton -- not accepted -- Puerto Rico lidflower
	Cananga blainii (Griseb.) Britton -- not accepted
	Cananga caribaea (Urb.) Britton -- not accepted
	Capnoides campestre Britton -- not accepted
	Capnoides micranthum (Engelm. ex A. Gray) Britton -- not accepted
	Capnoides montanum (Engelm.) Britton -- not accepted
	Carara didyma (L.) Britton -- not accepted
	Cardamine arenicola Britton -- not accepted
	Cardamine bulbosa (Schreb. ex Muhl.) Britton, Sterns & Poggenb. -- accepted -- bulb bittercress, bulbous bitter-cress, bulbous bittercress, cardamine bulbeuse
	Cardamine douglassii Britton -- accepted -- limestone bittercress
	Cardamine parviflora var. arenicola (Britton) O.E. Schulz -- not accepted -- sand bittercress
	Carduus smallii (Britton) H.E. Ahles -- not accepted
	Carex atratiformis Britton -- accepted -- black sedge, scrabrous black sedge
	Carex baileyi Britton -- accepted -- Bailey's sedge
	Carex bicknellii Britton -- accepted -- Bicknell's sedge, carex de Bicknell
	Carex bicknellii var. bicknellii Britton -- not accepted -- Bicknell's sedge
	Carex bonanzensis Britton -- accepted -- Yukon sedge
	Carex capillaris var. williamsii (Britton) B. Boivin -- not accepted
	Carex cristatella Britton -- accepted -- crested sedge
	Carex magellanica var. irrigua (Wahlenb.) Britton, Sterns & Poggenb. -- not accepted
	Carex mainensis Porter ex Britton -- not accepted
	Carex shriveri Britton -- not accepted
	Carex suberecta (Olney) Britton -- accepted -- prairie straw sedge
	Carex tribuloides var. moniliformis (Tuck.) Britton -- not accepted
	Carex williamsii Britton -- accepted -- Williams' sedge
	Carex X mainensis Porter ex Britton (pro sp.) -- not accepted -- Maine sedge
	Carnegia Britton & Rose -- not accepted
	Carnegia gigantea (Engelm.) Britton & Rose -- not accepted
	Carnegiea Britton & Rose -- accepted -- saguaro
	Carnegiea gigantea (Engelm.) Britton & Rose -- accepted -- Saguaro, saguaro
	Carya microcarpa (Nutt.) Britton -- not accepted
	Casparea congesta Britton & Rose -- not accepted
	Casparea jermyana Britton -- not accepted
	Caspareopsis monandra (Kurz) Britton & Rose -- not accepted
	Casparia congesta Britton & Rose -- not accepted
	Casparia jermyana Britton -- not accepted
	Cassia antillana (Britton & Rose) Alain -- not accepted
	Cassia fasciculata var. ferrisiae (Britton ex Britton & Rose) B.L. Turner -- not accepted
	Cassia orcuttii (Britton & Rose) B.L. Turner -- not accepted
	Castalia amazonum (Mart. & Zucc.) Britton & P. Wilson -- not accepted
	Castalia jamesoniana (Planch.) Britton & P. Wilson -- not accepted
	Castalia pulchella (DC.) Britton -- not accepted
	Castalia rudgeana (G. Mey.) Britton & P. Wilson -- not accepted
	Castilleja integra var. gloriosa (Britton) Cockerell -- accepted -- squawfeather, wholeleaf Indian paintbrush
	Celeri graveolens (L.) Britton -- not accepted
	Centaurea X moncktonii C.E. Britton -- accepted -- meadow knapweed, protean knapweed
	Centrosema floridanum (Britton) Lakela -- not accepted
	Cephalocereus alensis (F.A.C. Weber ex Rol.-Goss.) Britton & Rose -- not accepted
	Cephalocereus arrabidae (Lem.) Britton & Rose -- not accepted
	Cephalocereus bahamensis Britton -- not accepted
	Cephalocereus barbadensis Britton & Rose -- not accepted
	Cephalocereus brasiliensis Britton & Rose -- not accepted
	Cephalocereus brooksianus Britton & Rose -- not accepted
	Cephalocereus catingicola (G�rke) Britton & Rose -- not accepted
	Cephalocereus chrysacanthus (F.A.C. Weber) Britton & Rose -- not accepted
	Cephalocereus collinsii Britton & Rose -- not accepted
	Cephalocereus dybowskii (Rol.-Goss.) Britton & Rose -- not accepted
	Cephalocereus fluminensis (Miq.) Britton & Rose -- not accepted
	Cephalocereus gaumeri Britton & Rose -- not accepted
	Cephalocereus gounellei (F.A.C. Weber ex K. Schum.) Britton & Rose -- not accepted
	Cephalocereus keyensis Britton & Rose -- not accepted
	Cephalocereus lanuginosus (L.) Britton & Rose -- not accepted
	Cephalocereus leucocephalus (Poselg.) Britton & Rose -- not accepted
	Cephalocereus leucostele (G�rke) Britton & Rose -- not accepted
	Cephalocereus millspaughii Britton -- not accepted
	Cephalocereus monoclonos (DC.) Britton & Rose -- not accepted
	Cephalocereus moritzianus (Otto) Britton & Rose -- not accepted
	Cephalocereus nobilis (Haw.) Britton & Rose -- not accepted
	Cephalocereus pentaedrophorus (Labour.) Britton & Rose -- not accepted
	Cephalocereus phaeacanthus (G�rke) Britton & Rose -- not accepted
	Cephalocereus piauhyensis (G�rke) Britton & Rose -- not accepted
	Cephalocereus polygonus (Lam.) Britton & Rose -- not accepted
	Cephalocereus polylophus (DC.) Britton & Rose -- not accepted
	Cephalocereus purpusii Britton & Rose -- not accepted
	Cephalocereus robinii (Lem.) Britton & Rose -- not accepted
	Cephalocereus robustus Britton & Rose -- not accepted
	Cephalocereus royenii (L.) Britton & Rose -- not accepted
	Cephalocereus scoparius (Polseg.) Britton & Rose -- not accepted
	Cephalocereus smithianus Britton & Rose -- not accepted
	Cephalocereus swartzii (Griseb.) Britton & Rose -- not accepted
	Cephalocereus tweedyanus Britton & Rose -- not accepted
	Cephalocereus zehnteri Britton & Rose -- not accepted
	Cerastium arvense ssp. maximum (Hollick & Britton) Ugbor. -- not accepted -- field chickweed
	Cerastium arvense ssp. velutinum var. velutinum (Raf.) Britton -- not accepted -- field chickweed
	Cerastium arvense ssp. velutinum var. villosum (Muhl. ex Darl.) Hollick & Britton -- not accepted -- field chickweed
	Cerastium arvense var. maximum Hollick & Britton -- not accepted
	Cerastium arvense var. oblongifolium (Torr.) Hollick & Britton -- not accepted
	Cerastium arvense var. velutinum (Raf.) Britton -- not accepted -- field chickweed
	Cerastium arvense var. villosum (Muhl. ex Darl.) Hollick & Britton -- not accepted -- field chickweed
	Cerastium cerastioides (L.) Britton -- not accepted -- mountain chickweed, starwort chickweed
	Cerastium cerastoides (L.) Britton -- accepted -- mountain chickweed
	Cerastium longepedunculatum Muhl. ex Britton -- not accepted
	Cerastium texanum Britton -- accepted -- Texas chickweed, Texas mouse-ear chickweed
	Cereus albicaulis (Britton & Rose) Leutzelb. -- accepted
	Cereus argentinensis Britton & Rose -- accepted
	Cereus diffusus (Britton & Rose) Werderm. -- not accepted
	Cereus eriophorus var. fragrans (Small ex Britton & Rose) L.D. Benson -- not accepted -- fragrant prickly-apple
	Cereus gracilis var. simpsonii (Small ex Britton & Rose) L.D. Benson -- not accepted -- Simpson's prickly-apple
	Cereus grantianus (Britton) H.P. Kelsey & Dayton -- not accepted
	Cereus grenadensis Britton & Rose -- not accepted
	Cereus portoricensis (Britton) Urb. -- not accepted
	Cereus robinii var. keyensis (Britton & Rose) L.D. Benson -- not accepted
	Cereus smithianus (Britton & Rose) Werderm. -- not accepted
	Chamaecereus Britton & Rose -- not accepted
	Chamaecereus silvestrii (Speg.) Britton & Rose -- not accepted
	Chamaecrista chamaecristoides var. cruziana (Britton & Rose) H.S. Irwin & Barneby -- accepted -- beach sensitive pea
	Chamaecrista cruziana Britton & Rose -- not accepted
	Chamaecrista exunguis (Urb.) Britton -- not accepted
	Chamaecrista granulata (Urb.) Britton -- not accepted
	Chamaecrista mohrii (Pollard) Small ex Britton & Rose -- not accepted
	Chamaecrista swartzii (Wikstr.) Britton -- not accepted
	Chamaecyparis thyoides (L.) Britton, Sterns & Poggenb. -- accepted -- Atlantic white cedar, Atlantic white-cedar, southern white cedar, southern white-cedar
	Chamaefistula antillana Britton & Rose -- not accepted
	Chamaeraphis caudata (Lam.) Britton -- not accepted
	Chamaeraphis caudata var. caudata (Lam.) Britton -- not accepted
	Chamaesaracha coniodes (Moric. ex Dunal) Britton -- accepted -- gray false nightshade, gray five eyes
	Chamaesyce articulata (Burm.) Britton -- not accepted -- jointed sandmat
	Chamaesyce cowellii Millsp. ex Britton -- not accepted -- Cowell's sandmat
	Chamaesyce jenningsii Millsp. ex Britton -- not accepted
	Cheirinia aspera (Nutt.) Britton -- not accepted
	Chiapasia Britton & Rose -- not accepted
	Chiapasia nelsonii (Britton & Rose) Britton & Rose -- not accepted
	Chiococca pinetorum Britton ex Millsp. -- not accepted
	Chloris morales-coelloi Le�n ex Britton -- not accepted
	Chondrophora nudata (Michx.) Britton -- not accepted
	Chromolaena borinquensis (Britton) R.M. King & H. Rob. -- accepted -- limestone thoroughwort
	Chrysobalanus savannarum Britton -- not accepted
	Chrysopsis nuttallii Britton -- not accepted
	Chrysopsis pilosa (Walter) Britton non Nutt. -- not accepted -- soft goldenaster
	Chrysothamnus nauseosus (Pall. ex Pursh) Britton -- not accepted -- gray rabbitbrush
	Chrysothamnus nauseosus ssp. nauseosus (Pall. ex Pursh) Britton -- not accepted -- rubber rabbitbrush
	Chrysothamnus nauseosus var. nauseosus (Pall. ex Pursh) Britton -- not accepted
	Ciclospermum leptophyllum (Pers.) Sprague ex Britton & P. Wilson -- not accepted -- marsh parsley
	Cirsium muticum var. subpinnatifidum (Britton) Fernald -- not accepted
	Cirsium nebraskense (Britton) Lunell -- not accepted
	Cirsium smallii Britton -- not accepted
	Cleistocactus anguinus (G�rke) Britton & Rose -- not accepted
	Cleistocactus fieldianus (Britton & Rose) D.R. Hunt -- accepted
	Cleistocactus fieldianus ssp. fieldianus (Britton & Rose) D.R. Hunt -- accepted
	Cleistocactus smaragdiflorus (F.A.C. Weber) Britton & Rose -- accepted
	Clematis addisonii Britton -- accepted -- Addison's leather flower, Addison's virgin's bower
	Clematis viornioides Britton -- not accepted
	Cliftonia monophylla (Lam.) Britton ex Sarg. -- accepted -- black titi, buckwheat tree
	Clistanthocereus fieldianus (Britton & Rose) Backeb. -- not accepted
	Coccoloba borinquensis Britton -- not accepted
	Cochemiea halei (Brandegee) Britton & Rose -- not accepted
	Cochemiea poselgeri (Hildm.) Britton & Rose -- not accepted
	Cockerellia cockerellii (Britton) �. L�ve & D. L�ve -- not accepted
	Codonanthe triplinervia Britton -- not accepted
	Cojoba Britton & Rose -- accepted
	Cojoba arborea (L.) Britton & Rose -- accepted -- wild tamarind
	Cojoba graciliflora (S.F. Blake) Britton & Rose -- accepted -- Guadeloupe blackbead
	Columnea aripoensis Britton -- not accepted
	Columnea boliviana Britton ex Rusby -- not accepted
	Columnea cubensis (Urb.) Britton -- not accepted
	Columnea harrisii (Urb.) Britton ex C.V. Morton -- accepted
	Columnea scandens var. aripoensis (Britton) C.V. Morton -- not accepted
	Columnea tocoensis Britton -- not accepted
	Comocladia cuneata Britton -- accepted -- wedgeleaf maidenplum
	Conami portoricensis (Kuntze) Britton -- not accepted
	Conioselinum chinense (L.) Britton, Sterns & Poggenb. -- accepted -- Chinese hemlockparsley
	Copernicia alba Morong ex Morong & Britton -- accepted -- copernicia
	Copiapoa Britton & Rose -- accepted
	Copiapoa cinerascens (Salm-Dyck) Britton & Rose -- accepted
	Copiapoa cinerea (Phil.) Britton & Rose -- accepted
	Copiapoa cinerea ssp. cinerea (Phil.) Britton & Rose -- accepted
	Copiapoa coquimbana (Karw. ex R�mpler) Britton & Rose -- accepted
	Copiapoa echinoides (Lem.) Britton & Rose -- accepted
	Copiapoa marginata (Salm-Dyck) Britton & Rose -- accepted
	Copiapoa megarhiza Britton & Rose -- accepted
	Copiapoa megarhiza var. megarhiza Britton & Rose -- accepted
	Cordyline guineensis (L.) Britton -- not accepted
	Coreopsis major var. oemleri (Elliot) Britton ex Small & Vail -- not accepted
	Coriflora addisonii (Britton) W.A. Weber -- not accepted
	Corryocactus Britton & Rose -- accepted
	Corryocactus brachypetalus (Vaupel) Britton & Rose -- accepted
	Corryocactus brevistylus (K. Schum. ex Vaupel) Britton & Rose -- accepted
	Corryocactus brevistylus ssp. brevistylus (K. Schum. ex Vaupel) Britton & Rose -- not accepted
	Corryocactus melanotrichus (K. Schum.) Britton & Rose -- accepted
	Corydalis campestris (Britton) J. Buchholz & E.J. Palmer -- not accepted
	Coryphantha aggregata (Engelm.) Britton & Rose -- not accepted
	Coryphantha arizonica (Engelm. ex Brew & Wats) Britton & Rose -- not accepted
	Coryphantha bumamma (Ehrenb.) Britton & Rose -- not accepted
	Coryphantha chaffeyi (Britton & Rose) Fosberg -- not accepted -- Chaffey's cory cactus
	Coryphantha chlorantha (Engelm.) Britton & Rose -- not accepted
	Coryphantha compacta (Engelm.) Britton & Rose -- accepted
	Coryphantha connivens Britton & Rose -- not accepted
	Coryphantha cubensis Britton & Rose -- not accepted
	Coryphantha deserti (Engelm.) Britton & Rose -- not accepted
	Coryphantha durangensis (Runge ex K. Schum.) Britton & Rose -- accepted
	Coryphantha durangensis ssp. durangensis (Runge ex K. Schum.) Britton & Rose -- accepted
	Coryphantha echinoidea (Quehl) Britton & Rose -- accepted
	Coryphantha echinus (Engelm.) Britton & Rose -- not accepted -- Biznaga-partida erizo, rhinoceros cactus
	Coryphantha guerkeana (Boed.) Britton & Rose -- not accepted
	Coryphantha macromeris ssp. runyonii (Britton & Rose) N.P. Taylor -- accepted
	Coryphantha macromeris var. runyonii (Britton & Rose) L.D. Benson -- not accepted -- Runyon's beehive cactus
	Coryphantha missouriensis (Sweet) Britton & Rose -- not accepted
	Coryphantha muehlenpfordtii (Poselg.) Britton & Rose -- not accepted
	Coryphantha neomexicana (Engelm.) Britton & Rose -- not accepted
	Coryphantha nickelsiae (K. Brandegee) Britton & Rose -- accepted -- Biznaga-partida de Laredo, Nickels' cactus
	Coryphantha octacantha (DC.) Britton & Rose -- accepted
	Coryphantha pallida Britton & Rose -- accepted
	Coryphantha pallida ssp. pallida Britton & Rose -- accepted
	Coryphantha palmeri Britton & Rose -- not accepted
	Coryphantha pectinata (Engelm.) Britton & Rose -- not accepted
	Coryphantha poselgeriana (A. Dietr.) Britton & Rose -- accepted
	Coryphantha radians (DC.) Britton & Rose -- not accepted
	Coryphantha recurvata (Engelm.) Britton & Rose -- accepted -- Biznaga-partida de espinas curvas, Santa Cruz beehive cactus
	Coryphantha retusa (Pfeiff.) Britton & Rose -- accepted
	Coryphantha robustispina (A. Schott ex Engelm.) Britton & Rose -- accepted -- Biznaga-partida de espinas gruesas
	Coryphantha robustispina ssp. robustispina (A. Schott ex Engelm.) Britton & Rose -- accepted
	Coryphantha runyonii Britton & Rose -- not accepted
	Coryphantha salm-dyckiana (Scheer) Britton & Rose -- not accepted
	Coryphantha similis (Engelm.) Britton & Rose -- not accepted
	Coryphantha sneedii (Britton & Rose) A. Berger -- not accepted
	Coryphantha sneedii (Britton & Rose) A. Berger -- not accepted -- Sneed pincushion cactus
	Coryphantha sneedii var. sneedii (Britton & Rose) A. Berger -- not accepted -- Sneed pincushion cactus
	Coryphantha sulcata (Engelm.) Britton & Rose -- accepted -- finger cactus, pineapple cactus
	Coryphantha sulcata var. sulcata (Engelm.) Britton & Rose -- not accepted -- pineapple cactus
	Coryphantha vivipara (Nutt.) Britton & Rose -- not accepted
	Corytoplectus grandifolius (Britton ex Rusby) Rodr.-Flores & L.E. Skog -- accepted
	Cracca cathartica (Sess� & Moc.) Britton & Millsp. -- not accepted
	Crantzia ambigua (Urb.) Britton -- not accepted
	Crataegus chrysocarpa var. piperi (Britton) Kruschke -- accepted -- Piper's hawthorn
	Crataegus columbiana var. occidentalis (Britton) Dorn -- not accepted
	Crataegus columbiana var. piperi (Britton) Eggl. -- not accepted
	Crataegus macracantha var. occidentalis (Britton) Eggl. -- not accepted
	Crataegus margarettae var. brownii (Britton) Sarg. -- accepted
	Crataegus margarettiae var. brownii (Britton) Sarg. -- not accepted
	Crataegus nitida (Engelm. ex Britton & A. Br.) Sarg. -- accepted -- glossy hawthorn
	Crataegus occidentalis Britton -- not accepted
	Crataegus piperi Britton -- not accepted -- Piper's hawthorn
	Crataegus porteri Britton -- not accepted
	Crataegus pruinosa var. porteri (Britton) Eggl. -- not accepted
	Crataegus punctata var. canescens Britton -- not accepted
	Crataegus succulenta var. occidentalis Britton -- not accepted
	Crataegus vailiae Britton -- accepted -- Miss Vail's hawthorn
	Crataegus viridis var. nitida Engelm. ex Britton & A. Br. -- not accepted
	Crescentia portoricensis Britton -- accepted -- calabash tree, higuero de sierra
	Critonia portoricensis (Urb.) Britton & P. Wilson -- accepted -- Puerto Rico thoroughwort
	Crocanthemum canadense (L.) Britton -- accepted -- Canada frostweed, Canada rockrose, crocanth�me du Canada
	Crocanthemum corymbosum (Michx.) Britton -- accepted -- pine barren frostweed
	Crocanthemum majus Britton -- not accepted
	Crocanthemum nashii (Britton) Barnhart -- accepted -- Florida scrub frostweed, Florida scrub sunrose
	Croton cueroensis Britton & P. Wilson -- not accepted
	Croton fishlockii Britton -- accepted -- Fishlock's croton
	Croton rigidus Britton -- not accepted -- yellow balsam
	Croton rusbyi Britton ex Rusby -- accepted
	Ctenidium molluscum var. condensatum (Schimp.) E. Britton -- not accepted
	Cumulopuntia ignota (Britton & Rose) F. Ritter -- not accepted
	Cunila origanoides (L.) Britton -- accepted -- common dittany
	Curcas curcas (L.) Britton & Millsp. -- not accepted
	Curcas hernandiifolia (Vent.) Britton -- not accepted
	Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P. Wilson -- accepted -- marsh parsley
	Cylindropuntia alamosensis (Britton & Rose) Backeb. -- not accepted
	Cylindropuntia alcahes var. burrageana (Britton & Rose) Rebman -- accepted
	Cylindropuntia burrageana (Britton & Rose) Backeb. -- not accepted
	Cylindropuntia caribaea (Britton & Rose) F.M. Knuth -- accepted
	Cylindropuntia X viridiflora (Britton & Rose) F.M. Knuth -- accepted
	Cymanchum anedadense (Britton) Alain -- not accepted
	Cymanchum monense (Britton) Alain -- not accepted
	Cynanchum anegadense (Britton) Alain -- not accepted -- Caribbean swallow-wort
	Cynanchum monense (Britton) Alain -- not accepted -- Mona Island swallow-wort
	Cynoctonum mitreola (L.) Britton -- not accepted
	Cyperus blodgettii Britton -- not accepted -- Blodgett's flatsedge
	Cyperus buckleyi Britton -- not accepted
	Cyperus bushii Britton -- not accepted
	Cyperus calcicola Britton -- not accepted -- Caribbean flatsedge
	Cyperus careyi Britton -- not accepted
	Cyperus cayennensis (Lam.) Britton, non Willd. ex Link -- not accepted
	Cyperus cylindricus (Elliott) Britton -- not accepted
	Cyperus deeringianus Britton & Small -- not accepted
	Cyperus diandrus var. capitatus Britton -- not accepted
	Cyperus esculentus var. angustispicatus Britton -- not accepted
	Cyperus esculentus var. hermannii (Buckley) Britton -- accepted -- chufa flatsedge, yellow nutgrass, yellow nutsedge
	Cyperus fendlerianus var. debilis (Britton) K�k. -- not accepted
	Cyperus floridanus Britton -- not accepted -- Florida flatsedge
	Cyperus granularis (Desf.) Britton -- not accepted
	Cyperus halei Torr. ex Britton -- not accepted
	Cyperus hallii Britton -- not accepted
	Cyperus hansenii Britton -- not accepted
	Cyperus litoreus (C.B. Clarke) Britton -- not accepted
	Cyperus martindalei auct. non Britton -- not accepted
	Cyperus multiflorus (Britton) Small -- not accepted
	Cyperus nashii Britton -- not accepted
	Cyperus niger var. capitatus (Britton) O'Neill -- not accepted
	Cyperus odoratus var. squarrosus (Britton) S.D. Jones, Wipff & R. Carter -- not accepted
	Cyperus parishii Britton -- accepted -- Parish flatsedge, Parish's flatsedge, Parish's nutgrass
	Cyperus pollardii Britton -- not accepted
	Cyperus pringlei Britton -- not accepted
	Cyperus regiomontanus Britton -- accepted -- Monterey flatsedge
	Cyperus retrorsus var. deeringianus (Britton & Small) Fernald & Griscom -- not accepted
	Cyperus retrorsus var. nashii (Britton) Fernald & Griscom -- not accepted
	Cyperus rusbyi Britton -- not accepted
	Cyperus speciosus var. squarrosus Britton -- not accepted
	Cyperus torreyi Britton -- not accepted
	Cyperus winkleri Britton & Small -- not accepted
	Cyperus wrightii Britton -- not accepted
	Cyrtospadix bicolor (Aiton) Britton & P. Wilson -- not accepted
	Danthonia domingensis ssp. shrevei (Britton) Conert -- accepted
	Danthonia shrevei Britton -- not accepted
	Dasistoma virginica (L.) Britton -- not accepted
	Dasystephana grayi (Kusnez.) Britton -- not accepted
	Dasystephana linearis (Froel.) Britton -- not accepted
	Deamia Britton & Rose -- not accepted
	Deamia testudo (Karw. ex Zucc.) Britton & Rose -- not accepted
	Dendroalsia E. Britton ex Broth. -- accepted
	Dendroalsia abietina (Hook.) E. Britton ex Broth. -- accepted
	Dendrocereus Britton & Rose -- accepted
	Dendrocereus nudiflorus (Engelm. ex Sauvalle) Britton & Rose -- accepted
	Dendrocereus undulosus (DC.) Britton & Rose -- accepted
	Dendropogonella (Schimp.) E. Britton -- accepted
	Denmoza Britton & Rose -- accepted
	Denmoza rhodacantha (Salm-Dyck) Britton & Rose -- accepted
	Dentaria incisifolia Eames ex Britton -- not accepted
	Descurainia incisa (Engelm. ex A. Gray) Britton -- accepted -- mountain tansymustard
	Descurainia incisa ssp. incisa (Engelm. ex A. Gray) Britton -- accepted -- mountain tansymustard
	Descurainia incisa var. incisa (Engelm. ex A. Gray) Britton -- not accepted
	Descurainia pinnata (Walter) Britton -- accepted -- green tansymustard, pinnate tansy mustard, pinnate tansymustard, tansymustard, western tansymustard
	Descurainia pinnata ssp. pinnata (Walter) Britton -- accepted -- western tansymustard
	Descurainia pinnata ssp. pinnata var. pinnata (Walter) Britton -- not accepted -- western tansymustard
	Desmanthus covillei (Britton & Rose) Wiggins ex B.L. Turner -- accepted -- Coville's bundleflower
	Desmodium tweedyi Britton -- accepted -- Tweedy's ticktrefoil
	Diamorpha cymosa (Nutt.) Britton ex Small -- not accepted
	Diamorpha smallii Britton ex Small -- accepted -- elf orpine
	Diapedium krugii (Urb.) Britton -- not accepted
	Dichromena floridensis Britton -- not accepted
	Dichromena nivea (Boeckeler) Boeckeler ex Britton -- not accepted
	Dichylium Britton -- not accepted
	Dichylium oerstedianum (Klotzsch & Garcke) Britton -- not accepted
	Dicranella pusilla (Hedw.) E. Britton -- not accepted
	Dicranodontium denudatum (Brid.) E. Britton -- accepted -- denuded dicranodontium moss
	Dicranodontium millsphaughii E. Britton -- not accepted
	Dicranodontium virginicum E. Britton -- not accepted
	Didymopanax gleasonii Britton & P. Wilson -- not accepted
	Discocactus bahiensis Britton & Rose -- accepted
	Discocactus hartmannii (K. Schum.) Britton & Rose -- accepted
	Discocactus heptacanthus (Barb. Rodr.) Britton & Rose -- accepted
	Discocactus heptacanthus ssp. heptacanthus (Barb. Rodr.) Britton & Rose -- not accepted
	Discocactus zehntneri Britton & Rose -- accepted
	Discocactus zehntneri ssp. zehntneri Britton & Rose -- accepted
	Disocactus eichlamii (Weing.) Britton & Rose -- accepted
	Disocactus nelsonii (Britton & Rose) Linding. -- accepted
	Disocactus nelsonii ssp. nelsonii (Britton & Rose) Linding. -- accepted
	Disporum hookeri var. parvifolium (S. Watson) Britton -- not accepted -- drops of gold
	Disporum maculatum (Buckley) Britton -- not accepted -- yellow mandarin
	Disporum parvifolium (S. Watson) Britton -- not accepted
	Disporum trachyandrum (Torr.) Britton -- not accepted
	Ditremexa hirsuta (L.) Britton & Rose ex Britton & P. Wilson -- not accepted
	Ditremexa marilandica (L.) Britton & Rose -- not accepted
	Ditremexa medsgeri (Shafer) Britton & Rose -- not accepted
	Ditremexa occidentalis (L.) Britton & Rose ex Britton & P. Wilson -- not accepted
	Ditrichum heteromallum (Hedw.) E. Britton -- accepted
	Doellingeria humilis (Willd.) Britton -- not accepted
	Doellingeria umbellata var. pubens (A. Gray) Britton -- accepted -- parasol whitetop
	Dolicholus pyramidalis auct. non (Lam.) Britton & P. Wilson -- not accepted
	Dolichothele (K. Schum.) Britton & Rose -- not accepted
	Dolichothele longimamma (DC.) Britton & Rose -- not accepted
	Dolichothele nelsonii (Britton & Rose) Backeb. -- not accepted
	Dolichothele sphaerica (A. Dietr.) Britton & Rose -- not accepted
	Dolichothele uberiformis (Zucc. ex Pfeiff.) Britton & Rose -- not accepted
	Dondia depressa auct. non (Pursh) Britton -- not accepted
	Dracocephalum nuttallii Britton -- not accepted
	Drummondia prorepens (Hedw.) E. Britton -- accepted
	Dryopteris dryopteris (L.) Britton -- not accepted
	Dryopteris X algonquinensis D.M. Britton -- accepted -- Algonquin woodfern
	Duchartrea sintenisii (Urb.) Britton -- not accepted
	Dudleya Britton & Rose -- accepted
	Dudleya caespitosa (Haw.) Britton & Rose -- not accepted -- sealettuce
	Dudleya cespitosa (Haw.) Britton & Rose -- accepted -- sealettuce
	Dudleya cotyledon (Jacq.) Britton & Rose -- not accepted
	Dudleya cymosa (Lem.) Britton & Rose -- accepted -- canyon liveforever
	Dudleya cymosa ssp. cymosa (Lem.) Britton & Rose -- accepted -- canyon liveforever
	Dudleya cymosa ssp. ovatifolia (Britton) Moran -- accepted -- Santa Monica Mountains dudleya
	Dudleya farinosa (Lindley) Britton & Rose -- accepted -- powdery liveforever
	Dudleya lanceolata (Nutt.) Britton & Rose -- accepted -- lanceleaf liveforever
	Dudleya laxa (Lindley) Britton & Rose -- not accepted
	Dudleya nevadensis (S. Watson) Britton & Rose -- not accepted
	Dudleya palmeri (S. Watson) Britton & Rose -- accepted -- Palmer's liveforever
	Dudleya pulverulenta (Nutt.) Britton & Rose -- accepted -- chalk dudleya, chalk liveforever
	Dudleya pulverulenta ssp. pulverulenta (Nutt.) Britton & Rose -- not accepted -- chalk dudleya
	Dudleya rusbyi (Greene) Britton & Rose -- not accepted
	Dudleya saxosa (M.E. Jones) Britton & Rose -- accepted -- Panamint liveforever
	Dudleya saxosa ssp. saxosa (M.E. Jones) Britton & Rose -- accepted -- Panamint dudleya, Panamint liveforever
	Dudleya setchellii (Jeps.) Britton & Rose -- not accepted -- Santa Clara Valley dudleya, Santa Clara Valley liveforever
	Duggena hirsuta (Jacq.) Britton ex Britton & P. Wilson -- not accepted
	Dulichium arundinaceum (L.) Britton -- accepted -- threeway sedge
	Dulichium arundinaceum var. arundinaceum (L.) Britton -- accepted -- three-way sedge
	Duranta arida Britton & P. Wilson -- accepted
	Ebenopsis Britton & Rose -- accepted -- Texas ebony
	Ebenopsis confinis (Standl.) Britton & Rose -- accepted
	Ecastaphyllum ecastaphyllum (L.) Britton -- not accepted
	Eccremocactus Britton & Rose -- not accepted
	Eccremocactus bradei Britton & Rose -- not accepted
	Echinacea paradoxa (J.B.S. Norton) Britton -- accepted -- Bush's purple coneflower
	Echinacea paradoxa var. paradoxa (J.B.S. Norton) Britton -- accepted -- Bush's purple coneflower
	Echinocereus barthelowanus Britton & Rose -- accepted
	Echinocereus caespitosus var. perbellus (Britton & Rose) D. Weniger -- not accepted
	Echinocereus chlorophthalmus (Hook.) Britton & Rose -- not accepted
	Echinocereus fitchii Britton & Rose -- not accepted
	Echinocereus grandis Britton & Rose -- accepted
	Echinocereus luteus Britton & Rose -- not accepted
	Echinocereus mamillatus (Engelm. ex J.M. Coult.) Britton & Rose -- not accepted
	Echinocereus octacanthus (Muehlenpf.) Britton & Rose -- not accepted
	Echinocereus pacificus (Engelm. ex Orcutt) Britton & Rose -- accepted
	Echinocereus palmeri Britton & Rose -- accepted
	Echinocereus palmeri ssp. palmeri Britton & Rose -- accepted
	Echinocereus perbellus Britton & Rose -- not accepted
	Echinocereus reichenbachii ssp. fitchii (Britton & Rose) N.P. Taylor -- not accepted
	Echinocereus reichenbachii ssp. perbellus (Britton & Rose) N.P. Taylor -- not accepted
	Echinocereus reichenbachii ssp. reichenbachii (Terscheck ex Walp.) Britton & Rose -- not accepted
	Echinocereus reichenbachii var. fitchii (Britton & Rose) L.D. Benson -- not accepted -- Fitch's hedgehog cactus
	Echinocereus reichenbachii var. perbellus (Britton & Rose) L.D. Benson -- accepted -- lace hedgehog cactus
	Echinocereus roetteri var. lloydii (Britton & Rose) Backeb. -- not accepted
	Echinocereus sarissophorus Britton & Rose -- not accepted
	Echinocereus scopulorum Britton & Rose -- accepted
	Echinocereus viridiflorus var. standleyi (Britton & Rose) Orcutt ex D. Weniger -- not accepted
	Echinocereus X lloydii Britton & Rose -- not accepted -- Lloyd's hedgehog cactus
	Echinofossulocactus albatus (A. Dietr.) Britton & Rose -- not accepted
	Echinofossulocactus arrigens (Link) Britton & Rose -- not accepted
	Echinofossulocactus confusus Britton & Rose -- not accepted
	Echinofossulocactus dichroacanthus (Mart.) Britton & Rose -- not accepted
	Echinofossulocactus heteracanthus (Muehlenpf.) Britton & Rose -- not accepted
	Echinofossulocactus lamellosus (A. Dietr.) Britton & Rose -- not accepted
	Echinofossulocactus lancifer (A. Dietr.) Britton & Rose -- not accepted
	Echinofossulocactus lloydii Britton & Rose -- not accepted
	Echinofossulocactus pentacanthus (Lem.) Britton & Rose -- not accepted
	Echinofossulocactus tricuspidatus (Scheidw.) Britton & Rose -- not accepted
	Echinofossulocactus violaciflorus (Quehl) Britton & Rose -- not accepted
	Echinofossulocactus zacatecasensis Britton & Rose -- not accepted
	Echinomastus Britton & Rose -- not accepted
	Echinomastus durangensis (Runge) Britton & Rose -- not accepted
	Echinomastus erectocentrus (J.M. Coult.) Britton & Rose -- not accepted
	Echinomastus erectocentrus var. erectocentrus (J.M. Coult.) Britton & Rose -- not accepted
	Echinomastus intertextus (Engelm.) Britton & Rose -- not accepted
	Echinomastus intertextus var. intertextus (Engelm.) Britton & Rose -- not accepted
	Echinomastus unguispinus (Engelm.) Britton & Rose -- not accepted
	Echinopsis aurea Britton & Rose -- accepted
	Echinopsis aurea ssp. aurea Britton & Rose -- accepted
	Echinopsis aurea ssp. shaferi (Britton & Rose) M. Lowry -- accepted
	Echinopsis bruchii (Britton & Rose) Friedrich & Glaetzle -- not accepted
	Echinopsis cuzcoensis (Britton & Rose) H. Friedrich & G.D. Rowley -- accepted
	Echinopsis ferox (Britton & Rose) Backeb. -- accepted
	Echinopsis formosa ssp. bruchii (Britton & Rose) M. Lowry -- accepted
	Echinopsis longispina (Britton & Rose) Werderm. -- not accepted
	Echinopsis pachanoi (Britton & Rose) H. Friedrich & G.D. Rowley -- accepted
	Echinopsis pampana (Britton & Rose) D.R. Hunt -- accepted
	Echinopsis peruviana (Britton & Rose) H. Friedrich & G.D. Rowley -- accepted
	Echinopsis peruviana ssp. peruviana (Britton & Rose) H. Friedrich & G.D. Rowley -- not accepted
	Echinopsis shaferi Britton & Rose -- not accepted
	Echinopsis spegazziniana Britton & Rose -- not accepted
	Echites echites (L.) Britton -- not accepted
	Ectropothecium caloosiense (Austin) E. Britton -- not accepted
	Eleocharis acicularis var. radicans (A. Dietr.) Britton -- not accepted
	Eleocharis coloradoensis (Britton) Gilly -- accepted -- dwarf spikerush
	Eleocharis leptos var. coloradoensis (Britton) Svenson -- not accepted
	Eleocharis macrostachya Britton -- accepted -- pale spikerush
	Eleocharis montevidensis var. parishii (Britton) V.E. Grant -- not accepted
	Eleocharis ovata var. engelmannii (Steud.) Britton -- not accepted
	Eleocharis parishii Britton -- accepted -- Parish spikerush, Parish's spikerush
	Eleocharis parvula var. coloradoensis (Britton) Beetle -- not accepted
	Eleocharis praticola Britton -- not accepted
	Eleocharis ravenelii Britton -- accepted -- Rio Grande spikerush
	Eleocharis shaferi Britton -- not accepted
	Eleocharis smallii Britton -- not accepted -- Small's spikerush
	Eleocharis wolfii (A. Gray) A. Gray ex Britton -- accepted -- wolf's spike-rush, Wolf's spikerush
	Eleocharis yunquensis Britton -- not accepted
	Emelista tora auct. non (L.) Britton & Rose ex Britton & P. Wilson -- not accepted
	Encyclia bifida (Aubl.) Britton & P. Wilson -- not accepted -- thicket butterfly orchid
	Encyclia fucata (Lindl.) Britton & Millsp. -- accepted -- West Indian butterfly orchid
	Encyclia krugii (Bello) Britton & P. Wilson -- not accepted
	Encyclia rufa (Lindl.) Britton & Millsp. -- accepted -- rufous butterfly orchid
	Encyclia sintenisii (Rchb. f.) Britton -- not accepted -- Sintenis' butterfly orchid
	Entadopsis polyphylla (Benth.) Britton -- not accepted
	Entosthodon leibergii E. Britton -- not accepted
	Epibaterium carolinum (L.) Britton -- not accepted
	Epiphyllanthus candidus (Loefgr.) Britton & Rose -- not accepted
	Epiphyllanthus microsphaericus (K. Schum.) Britton & Rose -- not accepted
	Epiphyllanthus obovatus (Engelm. ex K. Schum.) Britton & Rose -- not accepted
	Epiphyllum cartagense (F.A.C. Weber) Britton & Rose -- accepted
	Epiphyllum caudatum Britton & Rose -- not accepted
	Epiphyllum costaricense (F.A.C. Weber) Britton & Rose -- not accepted
	Epiphyllum darrahii (K. Schum.) Britton & Rose -- not accepted
	Epiphyllum grandilobum (F.A.C. Weber) Britton & Rose -- accepted
	Epiphyllum guatemalense Britton & Rose -- not accepted
	Epiphyllum hookeri ssp. guatemalense (Britton & Rose) Ralf Bauer -- accepted
	Epiphyllum lepidocarpum (F.A.C. Weber) Britton & Rose -- accepted
	Epiphyllum nelsonii Britton & Rose -- not accepted
	Epiphyllum pittieri (F.A.C. Weber) Britton & Rose -- not accepted
	Epiphyllum pumilum Britton & Rose -- accepted
	Epiphyllum stenopetalum (C.F. F�rst.) Britton & Rose -- not accepted
	Epiphyllum strictum (Lem.) Britton & Rose -- not accepted
	Epiphyllum thomasianum (K. Schum.) Britton & Rose -- accepted
	Epiphyllum thomasianum ssp. thomasianum (K. Schum.) Britton & Rose -- accepted
	Epithelantha A. Weber ex Britton & Rose -- accepted -- pingpong ball cactus
	Epithelantha micromeris (Engelm.) A. Weber ex Britton & Rose -- accepted -- Biznaga-blanca chilona, pingpong ball cactus
	Epithelantha micromeris ssp. micromeris (Engelm.) A. Weber ex Britton & Rose -- not accepted
	Epithelantha micromeris var. micromeris (Engelm.) A. Weber ex Britton & Rose -- not accepted -- pingpong ball cactus
	Eragrostis hypnoides (Lam.) Britton, Sterns & Poggenb. -- accepted -- creeping lovegrass, teal love grass, teal lovegrass
	Erdisia Britton & Rose -- not accepted
	Erdisia meyenii Britton & Rose -- not accepted
	Erdisia philippii (Regel & Schmidt) Britton & Rose -- not accepted
	Erdisia spiniflora (Phil.) Britton & Rose -- not accepted
	Erdisia squarrosa (Vaupel) Britton & Rose -- not accepted
	Erigeron ramosus (Walter) Britton, Sterns & Poggenb. -- not accepted
	Erigeron subtrinervis Rydb. ex Porter & Britton -- accepted -- three-nerve fleabane, threenerve fleabane, threeveined fleabane
	Erigeron subtrinervis var. subtrinervis Rydb. ex Porter & Britton -- not accepted -- threenerve fleabane
	Eriosyce ceratistes (Otto) Britton & Rose -- not accepted
	Ernodea cokeri Britton ex Coker -- accepted -- one-nerved ernodea
	Eroteum albopunctatum (Griseb.) Britton -- not accepted
	Eschenbachia lyrata (Kunth) Britton & Millsp. -- not accepted
	Escobaria Britton & Rose -- accepted -- foxtail cactus, pincushion cactus
	Escobaria bella Britton & Rose -- not accepted
	Escobaria chaffeyi Britton & Rose -- not accepted -- Biznaga-Escobar de Cedros
	Escobaria chihuahuensis Britton & Rose -- accepted
	Escobaria chihuahuensis ssp. chihuahuensis Britton & Rose -- accepted
	Escobaria cubensis (Britton & Rose) D.R. Hunt -- accepted
	Escobaria dasyacantha (Engelm.) Britton & Rose -- accepted -- Big Bend foxtail cactus, Biznaga-Escobar de espinas gruesas
	Escobaria dasyacantha ssp. chaffeyi (Britton & Rose) N.P. Taylor -- accepted
	Escobaria dasyacantha ssp. dasyacantha (Engelm.) Britton & Rose -- accepted
	Escobaria dasyacantha var. chaffeyi (Britton & Rose) N.P. Taylor -- not accepted -- Chaffey's foxtail cactus
	Escobaria dasyacantha var. dasyacantha (Engelm.) Britton & Rose -- not accepted -- Big Bend foxtail cactus
	Escobaria lloydii Britton & Rose -- accepted
	Escobaria runyonii Britton & Rose -- not accepted
	Escobaria sneedii Britton & Rose -- accepted -- carpet foxtail cactus
	Escobaria sneedii ssp. sneedii Britton & Rose -- accepted
	Escobaria sneedii var. sneedii Britton & Rose -- not accepted -- carpet foxtail cactus, Sneed's foxtail cactus
	Escobaria tuberculosa (Engelm.) Britton & Rose -- accepted -- Biznaga-Escobar r�mbica, white column foxtail cactus
	Espostoa Britton & Rose -- accepted
	Espostoa lanata (Kunth) Britton & Rose -- accepted
	Espostoa lanata ssp. lanata (Kunth) Britton & Rose -- accepted
	Eubotrys recurva (Buckley) Britton -- accepted -- mountain fetterbush, redtwig doghobble
	Eugenia boqueronensis Britton -- accepted -- Sierra de Cayey stopper
	Eugenia borinquensis Britton -- accepted -- guayabota de sierra
	Eugenia cordzalensis Britton -- not accepted
	Eugenia corozalensis Britton -- accepted -- sperry guava
	Eugenia stewardsonii Britton -- accepted -- Stewardson's stopper
	Eugenia underwoodii Britton -- accepted -- Underwood's stopper
	Eugenia xerophytica Britton -- not accepted -- aridland stopper
	Eulychnia iquiquensis (K. Schum.) Britton & Rose -- accepted
	Eulychnia iquiquensis ssp. iquiquensis (K. Schum.) Britton & Rose -- accepted
	Eupatorium borinquense (Britton) B.L. Rob. -- not accepted -- limestone thoroughwort
	Eupatorium dolicholepis (Urb.) Britton -- not accepted -- oreganillo
	Eupatorium petaloideum Britton ex Small -- accepted -- snowy white thoroughwort
	Eupatorium rotundifolium var. saundersii (Porter ex Britton) Cronquist -- not accepted
	Euphorbia cowellii (Millsp. ex Britton) Oudejans -- accepted -- Cowell's sandmat
	Euphorbia tithymaloides ssp. jamaicensis (Millsp. & Britton) V.W. Steinm. -- accepted
	Euthamia caroliniana (L.) Greene ex Porter & Britton -- not accepted
	Euthamia leptocephala (Torr. & A. Gray) Greene ex Porter & Britton -- accepted -- bushy goldentop
	Evolvulus squamosus Britton -- accepted -- rockyplains dwarf morning-glory
	Exogonium solanifolium (L.) Britton -- not accepted
	Exostema sanctae-luciae (Kentish) Britton -- accepted -- Jamaicanbark
	Facheiroa Britton & Rose -- accepted
	Facheiroa pubiflora Britton & Rose -- not accepted
	Ferocactus Britton & Rose -- accepted -- barrel cactus
	Ferocactus acanthodes (Lem.) Britton & Rose -- not accepted
	Ferocactus acanthodes var. acanthodes (Lem.) Britton & Rose -- not accepted -- viznaga
	Ferocactus alamosanus (Britton & Rose) Britton & Rose -- accepted
	Ferocactus alamosanus ssp. alamosanus (Britton & Rose) Britton & Rose -- accepted
	Ferocactus chrysacanthus (Orcutt) Britton & Rose -- accepted
	Ferocactus chrysacanthus ssp. chrysacanthus (Orcutt) Britton & Rose -- accepted
	Ferocactus covillei Britton & Rose -- not accepted
	Ferocactus crassihamatus (F.A.C. Weber) Britton & Rose -- not accepted
	Ferocactus diguetii (F.A.C. Weber) Britton & Rose -- accepted
	Ferocactus echidne (DC.) Britton & Rose -- accepted
	Ferocactus emoryi ssp. covillei (Britton & Rose) D.R. Hunt & Dimmitt -- accepted
	Ferocactus flavovirens (Scheidw.) Britton & Rose -- accepted
	Ferocactus fordii (Orcutt) Britton & Rose -- accepted
	Ferocactus fordii ssp. fordii (Orcutt) Britton & Rose -- accepted
	Ferocactus glaucescens (DC.) Britton & Rose -- accepted
	Ferocactus haematacanthus (Muehlenpf.) Britton & Rose -- accepted
	Ferocactus hamatacanthus (Muehlenpf.) Britton & Rose -- accepted -- Biznaga-barril costillona, Turk's head
	Ferocactus hamatacanthus ssp. hamatacanthus (Muehlenpf.) Britton & Rose -- accepted
	Ferocactus hamatacanthus var. hamatacanthus (Muehlenpf.) Britton & Rose -- not accepted -- Turk's head
	Ferocactus johnsonii (Parry ex Engelm.) Britton & Rose -- not accepted
	Ferocactus johnstonianus Britton & Rose -- accepted
	Ferocactus latispinus (Haw.) Britton & Rose -- accepted
	Ferocactus latispinus ssp. latispinus (Haw.) Britton & Rose -- accepted
	Ferocactus lecontei (Engelm.) Britton & Rose -- not accepted -- Biznaga-barril de Gila
	Ferocactus macrodiscus (Mart.) Britton & Rose -- accepted
	Ferocactus macrodiscus ssp. macrodiscus (Mart.) Britton & Rose -- accepted
	Ferocactus peninsulae (F.A.C. Weber) Britton & Rose -- accepted
	Ferocactus peninsulae ssp. santa-maria (Britton & Rose) Pilbeam & Bowdery -- not accepted
	Ferocactus robustus (Link & Otto) Britton & Rose -- accepted
	Ferocactus santa-maria Britton & Rose -- accepted
	Ferocactus townsendianus Britton & Rose -- accepted
	Ferocactus townsendianus var. santa-maria (Britton & Rose) G.E. Linds. -- not accepted
	Ferocactus townsendianus var. santamaria (Britton & Rose) G.E. Linds. -- not accepted
	Ferocactus uncinatus (Galeotti ex Pfeiff.) Britton & Rose -- not accepted
	Ferocactus viridescens (Torr. & A. Gray) Britton & Rose -- accepted -- Biznaga-barril verdosa, coast barrel cactus, San Diego barrel cactus
	Ferocactus wislizeni (Engelm.) Britton & Rose -- accepted -- Biznaga-barril de Nuevo M�xico, candy barrel cactus, fishhook barrel cactus
	Ferocactus wislizenii (Engelm.) Britton & Rose -- not accepted
	Filago prolifera (Nutt. ex DC.) Britton non Pomel -- not accepted
	Fimbristylis castanea var. puberula (Michx.) Britton -- not accepted
	Fimbristylis curassavica (Britton) Alain -- not accepted
	Fimbristylis harperi Britton ex Small -- not accepted
	Fimbristylis harrisii (Britton) C.D. Adams -- not accepted -- Harris' fimbry
	Fimbristylis inaguensis Britton -- accepted -- Bahama fimbry
	Fimbristylis interior Britton -- not accepted
	Fimbristylis perpusilla R.M. Harper ex Small & Britton -- accepted -- Harper's fimbry
	Fimbristylis portoricensis (Britton) Alain -- not accepted
	Fimbristylis puberula var. interior (Britton) Kral -- accepted -- hairy fimbry
	Fragaria americana (Porter) Britton -- not accepted
	Frailea Britton & Rose -- accepted
	Frailea caespitosa (Speg.) Britton & Rose -- not accepted
	Frailea cataphracta (Dams) Britton & Rose -- accepted
	Frailea cataphracta ssp. cataphracta (Dams) Britton & Rose -- not accepted
	Frailea gracillima (Lem.) Britton & Rose -- accepted
	Frailea gracillima ssp. gracillima (Lem.) Britton & Rose -- accepted
	Frailea grahliana (F. Haage) Britton & Rose -- not accepted
	Frailea grahliana ssp. grahliana (F. Haage) Britton & Rose -- not accepted
	Frailea knippeliana (Quehl) Britton & Rose -- not accepted
	Frailea pumila (Lem.) Britton & Rose -- accepted
	Frailea pumila ssp. pumila (Lem.) Britton & Rose -- not accepted
	Frailea pygmaea (Speg.) Britton & Rose -- accepted
	Frailea pygmaea ssp. pygmaea (Speg.) Britton & Rose -- accepted
	Frailea schilinzkyana (F. Haage ex K. Schum.) Britton & Rose -- accepted
	Frailea schilinzkyana ssp. schilinzkyana (F. Haage ex K. Schum.) Britton & Rose -- accepted
	Fraxinus campestris Britton -- not accepted
	Fraxinus darlingtonii Britton -- not accepted
	Fraxinus michauxii Britton -- not accepted
	Fraxinus smallii Britton -- not accepted
	Fraxinus velutina var. toumeyi (Britton) Rehder -- not accepted
	Gaertneria acanthicarpa (Hook.) Britton -- not accepted
	Gaillardia suavis (A. Gray & Engelm.) Britton & Rusby -- accepted -- perfumeballs, sweet gaillardia
	Galactia regularis (L.) Britton, Sterns & Poggenb. -- accepted -- eastern milkpea
	Galactia volubilis (L.) Britton -- accepted -- downy milkpea
	Galatea bulbosa (Mill.) Britton -- not accepted
	Galium circaezans var. glabellum Britton -- not accepted
	Galium circaezans var. glabrum Britton -- not accepted
	Galium kamtschaticum var. oreganum (Britton) Piper -- not accepted
	Galium latifolium var. hispidifolium Small ex Britton -- not accepted
	Galium oreganum Britton -- accepted -- Oregon bedstraw
	Galium peregrina Britton, Sterns & Poggenb. -- not accepted
	Galium peregrinum Britton, Sterns & Poggenb. -- not accepted
	Galpinsia hartwegii (Benth.) Britton -- not accepted
	Garcia mayana Britton -- not accepted
	Garcinia hessii (Britton) Alain -- accepted -- lemon saptree
	Gaumerocassia ekmaniana (Urb.) Britton ex Britton & Rose -- not accepted
	Geranium bicknellii Britton -- accepted -- Bicknell's cranesbill, northern crane's-bill
	Geranium bicknellii var. bicknellii Britton -- not accepted -- Bicknell's cranesbill
	Geranium nemorale var. bicknellii (Britton) Fernald -- not accepted
	Gerardia besseyana Britton -- not accepted
	Gerardia paupercula (A. Gray) Britton -- not accepted
	Gerardia portoricensis Britton & P. Wilson -- not accepted
	Gerardia virginica (L.) Britton, Sterns & Poggenb. -- not accepted
	Gesneria clarensis Britton & P. Wilson -- accepted
	Gesneria earlei Urb. & Britton -- accepted
	Gesneria jamaicensis Britton -- accepted
	Gesneria leiocarpa Urb. & Britton -- not accepted
	Gesneria nipensis Britton & P. Wilson -- not accepted
	Gesneria purpurascens var. yamuriensis (Britton & P. Wilson) Borhidi -- not accepted
	Gesneria yamuriensis Britton & P. Wilson -- not accepted
	Ghinia spinosa (Sw.) Britton & P. Wilson -- not accepted
	Gilia acerosa (A. Gray) Britton -- not accepted
	Glabraria geniculata (Walter) Britton -- not accepted
	Glossoloma bolivianum (Britton ex Rusby) J.L. Clark -- accepted
	Glycine priceana (B.L. Rob.) Britton -- not accepted
	Gnaphalium helleri Britton -- not accepted
	Gnaphalium helleri var. helleri Britton -- not accepted -- Heller's cudweed
	Gnaphalium obtusifolium var. helleri (Britton) S.F. Blake -- not accepted
	Gormania debilis (S. Watson) Britton -- not accepted
	Gormania eastwoodiae Britton -- not accepted
	Gormania laxa Britton -- not accepted
	Gormania obtusata (A. Gray) Britton -- not accepted
	Gormania oregana (Nutt.) Britton -- not accepted
	Gormania watsonii Britton -- not accepted
	Grimmia evansii E. Britton -- not accepted
	Grimmia olympica E. Britton -- not accepted
	Grimmia philibertiana E. Britton -- not accepted
	Grossularia amara (McClatchie) Coville & Britton -- not accepted
	Grossularia binominata (A. Heller) Coville & Britton -- not accepted
	Grossularia californica (Hook. & Arn.) Coville & Britton -- not accepted
	Grossularia cognata (Greene) Coville & Britton -- not accepted
	Grossularia cruenta (Greene) Coville & Britton -- not accepted
	Grossularia curvata (Small) Coville & Britton -- not accepted
	Grossularia divaricata (Douglas) Coville & Britton -- not accepted
	Grossularia greeneana (A. Heller) Coville & Britton -- not accepted
	Grossularia greeneiana (A. Heller) Coville & Britton -- not accepted
	Grossularia hesperia (McClatchie) Coville & Britton -- not accepted
	Grossularia hystrix (Eastw.) Coville & Britton -- not accepted
	Grossularia inermis (Rydb.) Coville & Britton -- not accepted
	Grossularia irrigua (Douglas) Coville & Britton -- not accepted
	Grossularia lasiantha (Greene) Coville & Britton -- not accepted
	Grossularia lobbii (A. Gray) Coville & Britton -- not accepted
	Grossularia marshallii (Greene) Coville & Britton -- not accepted
	Grossularia menziesii (Pursh) Coville & Britton -- not accepted
	Grossularia missouriensis (Nutt.) Coville & Britton -- not accepted
	Grossularia parishii (A. Heller) Coville & Britton -- not accepted
	Grossularia quercetora (Greene) Coville & Britton -- not accepted
	Grossularia quercetorum (Greene) Coville & Britton -- not accepted
	Grossularia roezlii (Regel) Coville & Britton -- not accepted
	Grossularia rotundifolia (Michx.) Coville & Britton -- not accepted
	Grossularia sericea (Eastw.) Coville & Britton -- not accepted
	Grossularia setosa (Lindl.) Coville & Britton -- not accepted
	Grossularia speciosa (Pursh) Coville & Britton -- not accepted
	Grossularia velutina (Greene) Coville & Britton -- not accepted
	Grossularia victoris (Greene) Coville & Britton -- not accepted
	Grossularia watsoniana (Koehne) Coville & Britton -- not accepted
	Grusonia Rchb. f. ex Britton & Rose -- accepted
	Grusonia bradtiana (J.M. Coult.) Britton & Rose -- accepted
	Guapira bracei (Britton) Little -- not accepted
	Guapira floridana (Britton) Lundell -- not accepted
	Guilandina culebrae Britton & P. Wilson -- accepted
	Guilandina divergens (Urb.) Britton -- not accepted
	Guilandina ovalifolia (Urb.) Britton -- not accepted
	Guilandina portoricensis Britton & P. Wilson -- accepted
	Gundlachia corymbosa (Urb.) Britton ex Boldingh -- accepted -- yambush
	Gutierrezia sarothrae (Pursh) Britton & Rusby -- accepted -- broom snakeweed, broomweed, perennial snakeweed, stinkweed, turpentine weed, yellow top
	Gymnocalycium anisitsii (K. Schum.) Britton & Rose -- accepted
	Gymnocalycium anisitsii ssp. anisitsii (K. Schum.) Britton & Rose -- accepted
	Gymnocalycium brachyanthum (G�rke) Britton & Rose -- not accepted
	Gymnocalycium damsii (K. Schum.) Britton & Rose -- not accepted
	Gymnocalycium guerkeanum (Heese) Britton & Rose -- not accepted
	Gymnocalycium hyptiacanthum (Lem.) Britton & Rose -- not accepted
	Gymnocalycium joossensianum (Boed.) Britton & Rose -- not accepted
	Gymnocalycium kurtzianum (G�rke) Britton & Rose -- not accepted
	Gymnocalycium leeanum (Hook.) Britton & Rose -- not accepted
	Gymnocalycium megalothelon (Sencke) Britton & Rose -- not accepted
	Gymnocalycium melanocarpum (Arechav.) Britton & Rose -- not accepted
	Gymnocalycium mihanovichii (Fric & G�rke) Britton & Rose -- accepted
	Gymnocalycium monvillei (Lem.) Pfeiff. ex Britton & Rose -- accepted
	Gymnocalycium monvillei ssp. monvillei (Lem.) Pfeiff. ex Britton & Rose -- accepted
	Gymnocalycium mostii (G�rke) Britton & Rose -- accepted
	Gymnocalycium multiflorum (Hook.) Britton & Rose -- not accepted
	Gymnocalycium netrelianum (Monv.) Britton & Rose -- not accepted
	Gymnocalycium platense (Speg.) Britton & Rose -- not accepted
	Gymnocalycium saglione (F. Cels) Britton & Rose -- not accepted
	Gymnocalycium saglionis (F. Cels) Britton & Rose -- accepted
	Gymnocalycium saglionis ssp. saglionis (F. Cels) Britton & Rose -- not accepted
	Gymnocalycium schickendantzii (F.A.C. Weber) Britton & Rose -- accepted
	Gymnocalycium schickendantzii ssp. schickendantzii (F.A.C. Weber) Britton & Rose -- accepted
	Gymnocalycium spegazzinii Britton & Rose -- accepted
	Gymnocalycium spegazzinii ssp. spegazzinii Britton & Rose -- accepted
	Gymnocalycium stuckertii (Speg.) Britton & Rose -- not accepted
	Gymnocalycium uruguayense (Arechav.) Britton & Rose -- accepted
	Gymnopogon ambiguus (Michx.) Britton, Sterns & Poggenb. -- accepted -- bearded skeletongrass
	Hamatocactus Britton & Rose -- not accepted
	Harrisia Britton -- accepted -- applecactus
	Harrisia aboriginum Small ex Britton & Rose -- accepted -- aboriginal pricklyapple, prickly applecactus
	Harrisia adscendens (G�rke) Britton & Rose -- accepted
	Harrisia bonplandii (J. Parm. & Pfeiff.) Britton & Rose -- not accepted
	Harrisia brookii Britton -- accepted
	Harrisia earlei Britton & Rose -- accepted
	Harrisia eriophora (Pfeiff.) Britton -- accepted
	Harrisia fernowii Britton -- accepted
	Harrisia fragrans Small ex Britton & Rose -- accepted -- Caribbean applecactus
	Harrisia gracilis (Mill.) Britton -- accepted
	Harrisia martinii (Labour.) Britton -- accepted -- mooncactus
	Harrisia nashii Britton -- accepted
	Harrisia pomanensis (F.A.C. Weber ex K. Schum.) Britton & Rose -- accepted -- applecactus
	Harrisia pomanensis ssp. pomanensis (F.A.C. Weber ex K. Schum.) Britton & Rose -- not accepted
	Harrisia portoricensis Britton -- accepted -- higo chumbo, Puerto Rico applecactus
	Harrisia simpsonii Small ex Britton & Rose -- accepted -- Simpson's applecactus
	Harrisia taylorii Britton -- accepted
	Harrisia tortuosa (J. Forbes ex Otto & A. Dietr.) Britton & Rose -- accepted
	Hatiora Britton & Rose -- accepted
	Hatiora bambusoides (F.A.C. Weber) Britton & Rose -- not accepted
	Hatiora cylindrica Britton & Rose -- accepted
	Hatiora salicornioides (Haw.) Britton & Rose -- accepted
	Havardia mexicana (Rose) Britton & Rose -- accepted
	Havardia pallens (Benth.) Britton & Rose -- accepted -- haujillo
	Havardia sonorae (S. Watson) Britton & Rose -- accepted
	Hedyotis croftiae (Britton & Rusby) Shinners -- not accepted
	Hedysarum americanum (Michx. ex Pursh) Britton -- not accepted
	Helenium setigerum (DC.) Britton & Rusby -- not accepted
	Helianthemum nashii Britton -- not accepted -- Florida scrub frostweed
	Helianthium tenellum (Mart.) Britton -- not accepted
	Helianthocereus grandiflorus (Britton & Rose) Backeb. -- not accepted
	Helianthus canus (Britton) Woot. & Standl. -- not accepted
	Helianthus dalyi Britton -- not accepted
	Helianthus giganteus var. subtuberosus Britton -- not accepted
	Helianthus nuttallii ssp. rydbergii (Britton) R.W. Long -- accepted -- Rydberg's sunflower
	Helianthus nuttallii var. rydbergii (Britton) B. Boivin -- not accepted
	Helianthus nuttallii var. subtuberosus (Britton) B. Boivin -- not accepted
	Helianthus rydbergii Britton -- not accepted
	Helianthus scrophulariifolius Britton -- not accepted
	Helianthus subtuberosus (Britton) Britton -- not accepted
	Helianthus X ambiguus (A. Gray) Britton (pro sp.) -- accepted -- ambiguous sunflower
	Helianthus X kellermanii Britton (pro sp.) -- accepted -- Kellerman's sunflower
	Heliocereus (A. Berger) Britton & Rose -- not accepted
	Heliocereus cinnabarinus (Weing.) Britton & Rose -- not accepted
	Heliocereus elegantissimus Britton & Rose -- not accepted
	Heliocereus schrankii (Zucc. ex Seitz) Britton & Rose -- not accepted
	Heliocereus speciosus (Cav.) Britton & Rose -- not accepted
	Hepatica acuta (Pursh) Britton -- not accepted
	Heterosavia bahamensis (Britton) Petra Hoffm. -- accepted -- Bahama maidenbush
	Heterotheca subaxillaris (Lam.) Britton & Rusby -- accepted -- camphorweed, golden aster
	Heterotheca subaxillaris ssp. subaxillaris (Lam.) Britton & Rusby -- accepted
	Hibiscus oculiroseus Britton -- not accepted
	Hicoria alba Britton -- not accepted
	Hicoria aquatica (F. Michx.) Britton -- not accepted
	Hicoria cordiformis (Wangenh.) Britton -- not accepted
	Hicoria glabra (Mill.) Britton -- not accepted
	Hicoria myristiciformis (F. Michx.) Britton -- not accepted
	Hicoria ovata (Mill.) Britton -- not accepted
	Hicoria pecan (Marsh.) Britton -- not accepted
	Hieracium greenii Porter & Britton -- not accepted -- Maryland hawkweed
	Hieracium X alleghaniense Britton (pro sp.) -- accepted -- Allegheny hawkweed
	Hipposelinum levisticum (L.) Britton & Rose -- not accepted
	Hoffmannseggia peninsularis (Britton) Wiggins -- accepted
	Hohenbergia attenuata Britton -- accepted -- longtip lacebark
	Homalobus tenellus (Pursh) Britton -- not accepted
	Homalocenchrus virginicus (Willd.) Britton -- not accepted
	Homalocephala Britton & Rose -- not accepted
	Homalocephala texensis (Hopffer) Britton & Rose -- not accepted
	Houstonia croftiae Britton & Rusby -- accepted -- Croft's bluet
	Houstonia lanceolata (Poir.) Britton -- not accepted
	Houstonia purpurea var. pubescens Britton -- not accepted
	Hyalocereus (A. Berger) Britton & Rose -- not accepted
	Hyalocereus lemairei (Hook.) Britton & Rose -- not accepted
	Hyalocereus undatus (Haw.) Britton & Rose -- not accepted
	Hylocereus (A. Berger) Britton & Rose -- accepted -- nightblooming cactus
	Hylocereus antiguensis Britton & Rose -- not accepted
	Hylocereus calcaratus (F.A.C. Weber) Britton & Rose -- accepted
	Hylocereus costaricensis (F.A.C. Weber) Britton & Rose -- accepted -- Costa Rica nightblooming cactus
	Hylocereus cubensis Britton & Rose -- not accepted
	Hylocereus extensus (Salm-Dyck ex DC.) Britton & Rose ex Rose -- accepted
	Hylocereus guatemalensis (Eichlam) Britton & Rose -- accepted
	Hylocereus lemairei (Hook.) Britton & Rose -- not accepted
	Hylocereus minutiflorus Britton & Rose -- accepted
	Hylocereus monacanthus (Lem.) Britton & Rose -- accepted -- nightblooming cereus
	Hylocereus napoleonis (Graham) Britton & Rose -- not accepted
	Hylocereus ocamponis (Salm-Dyck) Britton & Rose -- accepted
	Hylocereus polyrhizus (F.A.C. Weber) Britton & Rose -- not accepted
	Hylocereus purpusii (Weing.) Britton & Rose -- not accepted
	Hylocereus stenopterus (F.A.C. Weber) Britton & Rose -- accepted
	Hylocereus triangularis (L.) Britton & Rose -- accepted
	Hylocereus undatus (Haw.) Britton & Rose -- accepted -- nightblooming cactus, Pitahaya orejona
	Hylocereus venezuelensis Britton & Rose -- not accepted
	Hymenorebutia aurea (Britton & Rose) F. Ritter -- not accepted
	Hypericum boreale (Britton) E.P. Bicknell -- not accepted -- northern St. Johnswort
	Hypericum denticulatum var. ovalifolium (Britton) S.F. Blake -- not accepted
	Hypericum gentianoides (L.) Britton, Sterns & Poggenb. -- accepted -- orangegrass, pinweed St. Johnswort
	Hypericum majus (A. Gray) Britton -- accepted -- greater Canadian St. John's-wort, large St. Johnswort
	Hypericum mutilum ssp. boreale (Britton) J.M. Gillett -- accepted -- northern St. Johnswort
	Hypochaeris chillensis (Kunth) Britton -- accepted -- Brazilian cat's ear, Tweedy's cat's ear
	Icacorea glauciflora (Urb.) Britton -- not accepted
	Icacorea guadalupensis (Duchass. ex Griseb.) Britton ex P. Wilson -- not accepted
	Icacorea luquillensis Britton -- not accepted
	Ilex arimensis (Loes.) Britton ex R.O. Williams -- accepted
	Ilex bronxensis Britton -- not accepted
	Ilex cookii Britton & P. Wilson -- accepted -- Cook's holly
	Ilex montana var. mollis (A. Gray) Britton -- not accepted
	Ilex sintenisii (Urb.) Britton -- not accepted -- Sintenis' holly
	Inga inga (L.) Britton -- not accepted
	Ionidium portoricense (Urb.) Krug & Urb. ex Britton & P. Wilson -- not accepted
	Iris georgiana Britton -- not accepted
	Isandrina emarginata (L.) Britton & Rose -- not accepted
	Isanthus brachiatus (L.) Britton, Sterns & Poggenb. -- not accepted -- false pennyroyal, fluxweed
	Isoetes appalachiana D.F. Brunt. & D.M. Britton -- not accepted -- Appalachian quillwort
	Isoetes junciformis D.F. Brunt. & D.M. Britton -- accepted -- rush quillwort
	Isoetes melanopoda ssp. silvatica D.F. Brunt. & D.M. Britton -- accepted -- blackfoot quillwort
	Isoetes prototypus D.M. Britton -- accepted -- spike quillwort
	Isoetes X echtuckeri D.F. Brunt. & D.M. Britton -- accepted
	Isoetes X jeffreyi D.M. Britton & D.F. Brunt. -- accepted -- Jeffrey's quillwort
	Isoetes X novae-angliae D.F. Brunt. & D.M. Britton -- accepted
	Isoetes X pseudotruncata D.M. Britton & D.F. Brunt. -- accepted
	Isoloma sprucei Britton ex Rusby -- not accepted
	Jacquemontia cayensis Britton -- accepted -- sandyplain clustervine
	Jacquemontia subsalina Britton -- not accepted
	Jacquiniella teretifolia (Sw.) Britton & P. Wilson -- accepted -- Jacquiniella carnosa, moss tufted orchid
	Jaegerinopsis squarrosa E. Britton -- not accepted
	Jasminocereus Britton & Rose -- accepted
	Jasminocereus galapagensis (F.A.C. Weber) Britton & Rose -- not accepted
	Juniperus lucayana auct. non Britton -- not accepted
	Justicia borinquensis Britton -- not accepted -- Monte Cerrote water-willow
	Kneiffia allenii (Britton) Small -- not accepted
	Koellia hyssopifolia (Benth.) Britton -- not accepted
	Koellia pilosa (Nutt.) Britton -- not accepted
	Kohleria sprucei (Britton ex Rusby) Fritsch -- not accepted
	Krainzia longiflora (Britton & Rose) Backeb. -- not accepted
	Krameria imparata (J.F. Macbr.) Britton -- not accepted
	Lacinaria smallii Britton -- not accepted
	Lactuca spicata var. integrifolia (Torr. & A. Gray) Britton -- not accepted
	Lactuca steelei Britton -- not accepted
	Lagenocarpus portoricensis Britton -- not accepted
	Lantana arida Britton -- not accepted
	Lantana bahamensis auct. non Britton -- not accepted
	Lantana ovatifolia auct. non Britton. -- not accepted
	Lappula texana (Scheele) Britton -- not accepted
	Larrea wootonii Britton -- not accepted -- Wooton's holdback
	Lathyrus arizonicus Britton -- not accepted
	Lathyrus lanszwertii var. arizonicus (Britton) S.L. Welsh -- not accepted
	Lauro-cerasus myrtifolia (L.) Britton -- not accepted
	Laurocerasus myrtifolia (L.) Britton -- not accepted
	Lavauxia brachycarpa (A. Gray) Britton -- not accepted
	Lavauxia watsonii (Britton) Small -- not accepted
	Leavenworthia uniflora (Michx.) Britton -- accepted -- Michaux's gladecress
	Lebretonia paniculata (Cav.) Britton -- not accepted
	Lechea divaricata Shuttlw. ex Britton -- accepted -- dry-sand pinweed, drysand pinweed, spreading pinweed
	Lechea intermedia Legg. ex Britton -- accepted -- large-pod pinweed, largepod pinweed
	Lechea intermedia var. intermedia Legg. ex Britton -- accepted -- largepod pinweed, L�ch�a interm�diaire
	Lechea leggettii Britton & Hollick -- not accepted
	Lechea major var. divaricata (Shuttlw. ex Britton) A. Gray -- not accepted
	Lechea maritima Legg. ex Britton, Sterns & Poggenb. -- accepted -- beach pinweed, hoary pinweed, seaside pinweed
	Lechea maritima var. maritima Legg. ex Britton, Sterns & Poggenb. -- accepted -- beach pinweed
	Lechea minor var. maritima (Legg. ex Britton, Sterns & Poggenb.) A. Gray -- not accepted
	Lechea tripetala (Moc. & Sess� ex Dunal) Britton -- accepted -- threepetal pinweed
	Legousia perfoliata (L.) Britton -- not accepted
	Leiphaimos portoricensis Britton -- not accepted
	Lemaireocereus Britton & Rose -- not accepted
	Lemaireocereus aragonii (F.A.C. Weber) Britton & Rose -- not accepted
	Lemaireocereus beneckei (Ehrenb.) Britton & Rose -- not accepted
	Lemaireocereus cartwrightianus Britton & Rose -- not accepted
	Lemaireocereus chende (Rol.-Goss.) Britton & Rose -- not accepted
	Lemaireocereus chichipe (Rol.-Goss.) Britton & Rose -- not accepted
	Lemaireocereus deficiens (Otto & A. Dietr.) Britton & Rose -- not accepted
	Lemaireocereus eichlamii Britton & Rose -- not accepted
	Lemaireocereus godingianus Britton & Rose -- not accepted
	Lemaireocereus griseus (Haw.) Britton & Rose -- not accepted
	Lemaireocereus hollianus (F.A.C. Weber) Britton & Rose -- not accepted
	Lemaireocereus hystrix (Haw.) Britton & Rose -- not accepted
	Lemaireocereus laetus (Kunth) Britton & Rose -- not accepted
	Lemaireocereus longispinus Britton & Rose -- not accepted
	Lemaireocereus mixtecensis (J.A. Purpus) Britton & Rose -- not accepted
	Lemaireocereus montanus Britton & Rose -- not accepted
	Lemaireocereus pruinosus (Otto ex Pfeiff.) Britton & Rose -- not accepted
	Lemaireocereus stellatus (Pfeiff.) Britton & Rose -- not accepted
	Lemaireocereus thurberi (Engelm.) Britton & Rose -- not accepted
	Lemaireocereus weberi (J.M. Coult.) Britton & Rose -- not accepted
	Lendneria verticillata (Mill.) Britton -- not accepted
	Leocereus Britton & Rose -- accepted
	Leocereus bahiensis Britton & Rose -- accepted
	Leocereus glaziovii (K. Schum.) Britton & Rose -- not accepted
	Leocereus melanurus (K. Schum.) Britton & Rose -- not accepted
	Leontodon erythrospermum (Andrz. ex Besser) Britton -- not accepted
	Leontodon latiloba (DC.) Britton -- not accepted
	Lepidocoryphantha macromeris ssp. runyonii (Britton & Rose) Doweld -- not accepted
	Lepidocoryphantha runyonii (Britton & Rose) Backeb. -- not accepted
	Lepismium bolivianum (Britton) Barthlott -- not accepted
	Lepismium crenatum (Britton) Barthlott -- not accepted
	Lepismium pittieri (Britton & Rose) Backeb. -- not accepted
	Leptilon canadense (L.) Britton -- not accepted
	Leptilon chinense (Jacq.) Britton -- not accepted
	Leptilon pusillum (Nutt.) Britton -- not accepted
	Leptocereus (A. Berger) Britton & Rose -- accepted
	Leptocereus arboreus Britton & Rose -- accepted
	Leptocereus assurgens (C. Wright ex Griseb.) Britton & Rose -- accepted
	Leptocereus grantianus Britton -- accepted -- sebucan
	Leptocereus leonii Britton & Rose -- accepted
	Leptocereus maxonii Britton & Rose -- not accepted
	Leptocereus prostratus Britton & Rose -- not accepted
	Leptocereus quadricostatus (Bello) Britton & Rose -- accepted -- pitahaya
	Leptocereus sylvestris Britton & Rose -- accepted
	Leptocereus weingartianus (E. Hartmann in Dams) Britton & Rose -- accepted
	Leptodontium excelsum (Sull.) E. Britton -- not accepted
	Leptoglottis angustisiliqua Britton & Rose -- not accepted
	Leptoglottis chapmanii Small ex Britton & Rose -- not accepted
	Leptoglottis floridana (Chapm.) Small ex Britton & Rose -- not accepted
	Leptoglottis hystricina Small ex Britton & Rose -- not accepted
	Leptoglottis microphylla (Dryand.) Britton & Rose -- not accepted
	Leptoglottis nelsonii Britton & Rose -- not accepted
	Leptoglottis nuttallii DC. ex Britton & Rose -- not accepted
	Leptoglottis occidentalis (Wooton & Standl.) Britton & Rose -- not accepted
	Lespedeza angustifolia var. brevifolia Britton -- not accepted
	Lespedeza intermedia (S. Watson) Britton -- not accepted
	Lespedeza prairea (Mack. & Bush) Britton -- not accepted
	Lespedeza stuevei var. angustifolia Britton -- not accepted
	Lespedeza texana Britton -- accepted -- Texas lespedeza
	Lespedeza virginica (L.) Britton -- accepted -- slender lespedeza
	Lespedeza X oblongifolia (Britton) W. Stone -- accepted -- oblong lespedeza
	Lesquerella engelmannii ssp. ovalifolia (Rydb. ex Britton) C. Clark -- not accepted
	Leucodontopsis floridana (Austin) E. Britton -- not accepted
	Levenworthia uniflora (Michx.) Britton -- not accepted
	Liatris graminifolia var. smallii (Britton) Fernald & Grisc. -- not accepted
	Liatris kansana Britton -- not accepted
	Ligusticum canadense (L.) Britton -- accepted -- Canadian licorice-root
	Limonium carolinianum (Walter) Britton -- accepted -- American thrift, canker root, Carolina sea lavender, Carolina sealavender, lavender thrift, seaside thrift
	Lindernia verticillata (Mill.) Britton -- not accepted
	Linum medium (Planch.) Britton -- accepted -- stiff yellow flax
	Linum medium var. medium (Planch.) Britton -- accepted -- stiff yellow flax
	Lippia alba (Mill.) N.E. Br. ex Britton & P. Wilson -- accepted -- bushy lippia, white lippia
	Lippia helleri Britton -- not accepted
	Lippia ligustrina (Lag.) Britton -- not accepted
	Lippia micromera var. helleri (Britton) Moldenke -- accepted -- Spanish thyme
	Lobivia Britton & Rose -- not accepted
	Lobivia andalgalensis (F.A.C. Weber ex K. Schum.) Britton & Rose -- not accepted
	Lobivia aurea (Britton & Rose) Backeb. -- not accepted
	Lobivia boliviensis Britton & Rose -- not accepted
	Lobivia bruchii Britton & Rose -- not accepted
	Lobivia cachensis (Speg.) Britton & Rose -- not accepted
	Lobivia caespitosa (J.A. Purpus) Britton & Rose -- not accepted
	Lobivia chionanthus (Speg.) Britton & Rose -- not accepted
	Lobivia cinnabarina (Hook.) Britton & Rose -- not accepted
	Lobivia corbula (Herrera) Britton & Rose -- not accepted
	Lobivia cumingii (Hopffer) Britton & Rose -- not accepted
	Lobivia famatimensis (Speg.) Britton & Rose -- not accepted
	Lobivia ferox Britton & Rose -- not accepted
	Lobivia formosa ssp. bruchii (Britton & Rose) Rausch -- not accepted
	Lobivia formosa ssp. grandis (Britton & Rose) Rausch -- not accepted
	Lobivia formosa var. bruchii (Britton & Rose) Rausch -- not accepted
	Lobivia formosa var. grandis (Britton & Rose) Rausch -- not accepted
	Lobivia grandiflora Britton & Rose -- not accepted
	Lobivia grandis Britton & Rose -- not accepted
	Lobivia haematantha (Speg.) Britton & Rose -- not accepted
	Lobivia lateritia (G�rke) Britton & Rose -- not accepted
	Lobivia longispina Britton & Rose -- not accepted
	Lobivia pampana Britton & Rose -- not accepted
	Lobivia pentlandii (Hook.) Britton & Rose -- not accepted
	Lobivia saltensis (Speg.) Britton & Rose -- not accepted
	Lobivia shaferi Britton & Rose -- not accepted
	Lobivia thionantha (Speg.) Britton & Rose -- not accepted
	Lophocereus (Engelm.) Britton & Rose -- not accepted
	Lophocereus sargentianus (Orcutt) Britton & Rose -- not accepted
	Lophocereus schottii (Engelm.) Britton & Rose -- not accepted -- Senita
	Lotus helleri Britton -- not accepted
	Lotus mearnsii (Britton) Greene -- not accepted -- Mearns' bird's-foot trefoil
	Lotus mearnsii var. mearnsii (Britton) Greene -- not accepted -- Mearns' bird's-foot trefoil
	Lotus purshianus var. helleri (Britton) Isely -- not accepted
	Lotus unifoliolatus var. helleri (Britton) Kartesz & Gandhi -- not accepted -- Heller's bird's-foot trefoil
	Ludwigia alternifolia var. linearifolia Britton -- not accepted
	Ludwigiantha brevipes Long ex Britton, A. Braun & Small -- not accepted
	Luetkea caespitosa (Nutt.) Britton -- not accepted
	Luetkea caespitosa var. elatior (S. Watson) Britton -- not accepted
	Lycopus amplectens var. pubens (Britton) Fernald -- not accepted
	Lycopus pubens Britton -- not accepted
	Lysiloma microphylla var. thornberi (Britton & Rose) Isely -- not accepted
	Lysiloma microphyllum var. thornberi (Britton & Rose) Isely -- not accepted
	Lysiloma thornberi Britton & Rose -- not accepted
	Lysimachia terrestris (L.) Britton, Sterns & Poggenb. -- accepted -- bog loosestrife, earth loosestrife, swamp candles
	Machaerocereus Britton & Rose -- not accepted
	Machaerocereus eruca (Brandegee) Britton & Rose -- not accepted
	Machaerocereus gummosus (Engelm.) Britton & Rose -- not accepted
	Maihuenia patagonica (Phil) Britton & Rose -- accepted
	Mallotonia gnaphalodes (L.) Britton -- not accepted
	Malpighia shaferi Britton & P. Wilson ex Britton -- not accepted
	Malpighia thompsonii Britton & P. Wilson -- not accepted
	Malus ioensis (Alph. Wood) Britton -- accepted -- Iowa crabapple, prairie crab apple, prairie crabapple, western crabapple
	Malus ioensis var. ioensis (Alph. Wood) Britton -- not accepted -- prairie crab apple, prairie crabapple
	Malus malus (L.) Britton -- not accepted
	Malus X soulardii (L.H. Bailey) Britton (pro sp.) -- accepted -- Soulard crab
	Malvastrum cochorifolium (Desr.) Britton ex Small -- not accepted
	Malvastrum corchorifolium (Desr.) Britton ex Small -- accepted -- Caribbean false mallow, false mallow
	Mamillopsis (E. Morren) F.A.C. Weber ex Britton & Rose -- not accepted
	Mamillopsis diguetii (F.A.C. Weber) Britton & Rose -- not accepted
	Mamillopsis senilis (Lodd. ex Salm-Dyck) F.A.C. Weber ex Britton & Rose -- not accepted
	Mammillaria albicans (Britton & Rose) A. Berger -- accepted
	Mammillaria albicans ssp. albicans (Britton & Rose) A. Berger -- accepted
	Mammillaria albicans ssp. fraileana (Britton & Rose) D.R. Hunt -- accepted
	Mammillaria armillata ssp. cerralboa (Britton & Rose) D.R. Hunt -- not accepted
	Mammillaria cerralboa (Britton & Rose) Orcutt -- accepted
	Mammillaria collinsii (Britton & Rose) Orcutt -- not accepted
	Mammillaria columbiana ssp. yucatanensis (Britton & Rose) D.R. Hunt -- accepted
	Mammillaria confusa (Britton & Rose) Orcutt -- not accepted
	Mammillaria evermanniana (Britton & Rose) Orcutt -- accepted
	Mammillaria fraileana (Britton & Rose) Backeb. -- not accepted
	Mammillaria grahamii ssp. sheldonii (Britton & Rose) D.R. Hunt -- accepted
	Mammillaria jaliscana (Britton & Rose) Boed. -- accepted
	Mammillaria jaliscana ssp. jaliscana (Britton & Rose) Boed. -- accepted
	Mammillaria lanata (Britton & Rose) Orcutt -- not accepted
	Mammillaria lloydii (Britton & Rose) Orcutt -- not accepted
	Mammillaria longicoma (Britton & Rose) A. Berger -- not accepted
	Mammillaria longiflora (Britton & Rose) A. Berger -- accepted
	Mammillaria longiflora ssp. longiflora (Britton & Rose) A. Berger -- accepted
	Mammillaria mercadensis (Britton & Rose) Patoni -- accepted
	Mammillaria microcarpa var. milleri (Britton & Rose) W.T. Marshall -- not accepted
	Mammillaria milleri (Britton & Rose) Boed. -- not accepted -- Biznaga de Miller
	Mammillaria milleri var. sheldonii (Britton & Rose) Neutel. -- not accepted
	Mammillaria multiformis (Britton & Rose) Backeb. -- not accepted
	Mammillaria nunezii (Britton & Rose) Orcutt -- accepted
	Mammillaria nunezii ssp. nunezii (Britton & Rose) Orcutt -- accepted
	Mammillaria occidentalis (Britton & Rose) Boed. -- not accepted
	Mammillaria peninsularis (Britton & Rose) Orcutt -- accepted
	Mammillaria pygmaea (Britton & Rose) A. Berger -- not accepted
	Mammillaria rekoi (Britton & Rose) Vaupel -- accepted
	Mammillaria rekoi ssp. rekoi (Britton & Rose) Vaupel -- accepted
	Mammillaria runyonii (Britton & Rose) Cory -- not accepted
	Mammillaria scrippsiana (Britton & Rose) Orcutt -- accepted
	Mammillaria sheldonii (Britton & Rose) Boed. -- not accepted
	Mammillaria slevinii (Britton & Rose) Boed. -- not accepted
	Mammillaria sneedi (Britton & Rose) Cory -- not accepted
	Mammillaria sneedii (Britton & Rose) Cory -- not accepted
	Mammillaria solisii (Britton & Rose) Boed. -- not accepted
	Mammillaria standleyi (Britton & Rose) Orcutt -- accepted
	Mammillaria swinglei (Britton & Rose) Boed. -- not accepted
	Mammillaria tenampensis (Britton & Rose) A. Berger -- not accepted
	Mammillaria viridiflora (Britton & Rose) Cory -- accepted -- Biznaga de flor verde, greenflower nipple cactus
	Mammillaria xanthina (Britton & Rose) Boed. -- not accepted
	Mammillaria yucatanensis (Britton & Rose) Orcutt -- not accepted
	Mariscus jamaicensis (Crantz) Britton -- not accepted
	Martiusia laurifolia (Poir.) Britton -- not accepted
	Martiusia rubiginosa (Juss. ex Pers.) Britton -- not accepted
	Matayba oppositifolia (A. Rich.) Britton -- accepted
	Matricaria grandiflora (Hook.) Britton -- not accepted
	Matucana Britton & Rose -- accepted
	Matucana haynei (Otto) Britton & Rose -- accepted
	Matucana haynei ssp. haynei (Otto) Britton & Rose -- accepted
	Maytenus elongata (Urb.) Britton -- accepted -- Puerto Rico mayten
	Maytenus ponceana Britton -- accepted -- ponce mayten
	Mediocactus Britton & Rose -- not accepted
	Mediocactus megalanthus (K. Schum. ex Vaupel) Britton & Rose -- not accepted
	Meehania Britton -- accepted
	Meehania cordata (Nutt.) Britton -- accepted -- Meehan's mint
	Megapterium fremontii (S. Watson) Britton -- not accepted
	Mehania Britton -- not accepted
	Mehania cordata (Nutt.) Britton -- not accepted
	Meibomia chapmanii (Britton) Small -- not accepted
	Meibomia procumbens (Mill.) Britton -- not accepted
	Meibomia sintenisii (Urb.) Britton -- not accepted
	Meibomia supina Britton -- not accepted
	Meibomia tweedyi (Britton) Vail -- not accepted
	Meibomia umbrosa Britton -- not accepted
	Meibomia wydleriana (Urb.) Britton -- not accepted
	Melampyrum latifolium (W.P.C. Barton) Muhl. ex Britton & A. Br. -- not accepted
	Melanthera calcicola Britton -- not accepted
	Melanthera confusa Britton -- not accepted
	Melocactus bahiensis (Britton & Rose) Luetzelb. -- accepted
	Melocactus bahiensis ssp. bahiensis (Britton & Rose) Luetzelb. -- accepted
	Melocactus broadwayi (Britton & Rose) A. Berger -- accepted -- Turk's cap
	Melocactus harlowii (Britton & Rose) Vaupel -- accepted
	Melocactus oaxacensis (Britton & Rose) Backeb. -- not accepted
	Melocactus ruestii ssp. oaxacensis (Britton & Rose) Elizondo -- not accepted
	Melocactus zehntneri (Britton & Rose) Leutzelb. -- accepted
	Menendezia biflora (Cogn.) Britton -- not accepted
	Menendezia stahlii (Cogn.) Britton -- not accepted
	Menendezia urbanii (Cogn.) Britton -- not accepted
	Mertensia alaskana Britton -- not accepted
	Mertensia paniculata var. alaskana (Britton) L.O. Williams -- accepted -- Alaska tall bluebells
	Mesadenia tuberosa (Nutt.) Britton -- not accepted
	Mesadenus lucayanus (Britton) Schltr. -- accepted -- Florida Keys ladies'-tresses, Spiranthes lucayana
	Metastelma anegadense Britton -- accepted
	Metastelma monense Britton -- accepted
	Miconia subcorymbosa Britton -- not accepted -- forest johnny berry, forest johnnyberry
	Microstylis unifolia (Michx.) Britton, Sterns & Poggenb. -- not accepted
	Mikania stevensiana Britton -- accepted -- Maricao River hempvine
	Mila Britton & Rose -- accepted
	Mila caespitosa Britton & Rose -- accepted
	Mila caespitosa ssp. caespitosa Britton & Rose -- accepted
	Mimosa hystricina (Small ex Britton & Rose) B.L. Turner -- accepted -- porcupine mimosa
	Mimosa nuttallii (DC. ex Britton & Rose) B.L. Turner -- accepted -- catclaw sensitivebriar, Nuttall's sensitive-briar
	Mimosa quadrivalvis var. hystricina (Small ex Britton & Rose) Barneby -- not accepted
	Mimosa quadrivalvis var. hystricina (Small ex Britton & Rose) Barneby -- not accepted
	Mimosa quadrivalvis var. nelsonii (Britton & Rose) Barneby -- accepted -- Nelson's mimosa
	Mimosa quadrivalvis var. nuttallii (DC. ex Britton & Rose) L.S. Beard ex Barneby -- not accepted
	Mimosa wherryana (Britton) Standl. -- not accepted
	Mimosopsis biuncifera (Benth.) Britton & Rose -- not accepted
	Mimosopsis wherryana Britton -- not accepted
	Mimusops emarginata (L.) Britton -- not accepted
	Minuartia dawsonensis (Britton) House -- accepted -- rock stitchwort
	Mirabella albicaulis (Britton & Rose) F. Ritter -- not accepted
	Mirabilis longiflora var. wrightiana (A. Gray ex Britton & Kearney) Kearney & Peebles -- not accepted -- sweet four o'clock
	Mirabilis wrightiana A. Gray ex Britton & Kearney -- not accepted
	Mitracarpus maxwelliae Britton & P. Wilson -- accepted -- Maxwell's girdlepod
	Mittenothammium diminutivum (Hampe) E. Britton -- not accepted
	Mittenothamnium diminutivum (Hampe) E. Britton -- not accepted
	Moldavica moldavica (L.) Britton -- not accepted
	Moldavica parviflora (Nutt.) Britton -- not accepted
	Moluchia pyramidata (L.) Britton -- not accepted
	Moluchia tomentosa (L.) Britton -- not accepted
	Monvillea Britton & Rose -- not accepted
	Monvillea albicaulis (Britton & Rose) R. Kiesling -- not accepted
	Monvillea amazonica (K. Schum. ex Vaupel) Britton & Rose -- not accepted
	Monvillea diffusa Britton & Rose -- not accepted
	Monvillea insularis (Hemsl.) Britton & Rose -- not accepted
	Monvillea maritima Britton & Rose -- not accepted
	Monvillea phatnosperma (K. Schum.) Britton & Rose -- not accepted
	Monvillea smithiana (Britton & Rose) Backeb. -- not accepted
	Monvillea spegazzinii (F.A.C. Weber) Britton & Rose -- not accepted
	Morongia angustata (Torr. & A. Gray) Britton -- not accepted
	Morongia microphylla (Dryand.) Britton -- not accepted
	Morongia portoricensis (Urb.) Britton -- not accepted
	Morongia uncinata (Willd.) Britton -- not accepted
	Mosiera xerophytica (Britton) Salywon -- accepted -- aridland stopper
	Mouriri helleri Britton -- accepted -- mameyuelo
	Muhlenbergia racemosa (Michx.) Britton, Sterns & Poggenb. -- accepted -- green muhly, marsh muhly
	Muhlenbergia tenuiflora (Willd.) Britton, Sterns & Poggenb. -- accepted -- slender muhly
	Muhlenbergia tenuiflora ssp. tenuiflora (Willd.) Britton, Sterns & Poggenb. -- not accepted
	Muhlenbergia tenuiflora var. tenuiflora (Willd.) Britton, Sterns & Poggenb. -- not accepted -- muhlenbergie t�nue vari�t� t�nue, slender muhly
	Myosotis virginica auct. non (L.) Britton, Sterns & Poggenb. -- not accepted
	Myrcia portoricensis (Britton) Cede�o-Mald. & Breckon ex F.S. Axelrod -- accepted -- Puerto Rico lidflower
	Myriophyllum pinnatum (Walter) Britton, Sterns & Poggenb. -- accepted -- cut-leaf water-milfoil, cutleaf watermilfoil, green parrotfeather
	Myrtillocactus cochal (Orcutt) Britton & Rose -- accepted
	Myrtillocactus eichlamii Britton & Rose -- accepted
	Myrtillocactus schenckii (J.A. Purpus) Britton & Rose -- accepted
	Nama ovata (Nutt. ex Choisy) Britton -- not accepted
	Nanomitrium megalosporum (Austin) E. Britton -- not accepted
	Negundo aceroides ssp. interius (Britton) �. L�ve & D. L�ve -- not accepted
	Negundo interius (Britton) Rydb. -- not accepted
	Neltuma velutina (Wooton) Britton & Rose -- not accepted
	Neoabbottia Britton & Rose -- not accepted
	Neoabbottia grantiana (Britton) Buxb. -- not accepted
	Neoabbottia paniculata (Lam.) Britton & Rose -- not accepted
	Neobesseya Britton & Rose -- not accepted
	Neobesseya missouriensis (Sweet) Britton & Rose -- not accepted
	Neobesseya notesteinii (Britton) Britton & Rose -- not accepted
	Neobesseya similis (Engelm. & A. Gray) Britton & Rose -- not accepted
	Neobesseya wissmannii (Hildm. ex K. Schum.) Britton & Rose -- not accepted
	Neolloydia Britton & Rose -- accepted
	Neolloydia beguinii (F.A.C. Weber ex K. Schum.) Britton & Rose -- not accepted
	Neolloydia clavata (Scheidw.) Britton & Rose -- not accepted
	Neolloydia conoidea (DC.) Britton & Rose -- accepted -- Biznaga-c�nica, Chihuahuan beehive
	Neomammillaria Britton & Rose -- not accepted
	Neomammillaria multiformis Britton & Rose -- not accepted
	Neomammillaria nivosa (Link ex Pfeiff.) Britton & Rose -- not accepted
	Neomammillaria rekoi Britton & Rose -- not accepted
	Neomammillaria similis (Engelm.) Britton & Rose ex Rydb. -- not accepted
	Neopieris mariana (L.) Britton -- not accepted
	Neopieris nitida (W. Bartram ex Marshall) Britton -- not accepted
	Neoporteria Britton & Rose -- not accepted
	Neoporteria chilensis (Hildm. ex K. Schum.) Britton & Rose -- not accepted
	Neoporteria fusca (Muehlenpf.) Britton & Rose -- not accepted
	Neoporteria jussieui (Monv. ex Salm-Dyck) Britton & Rose -- not accepted
	Neoporteria nidus (S�hrens) Britton & Rose -- not accepted
	Neoporteria nigricans (Linke) Britton & Rose -- not accepted
	Neoporteria subgibbosa (Haw.) Britton & Rose -- not accepted
	Neoraimondia Britton & Rose -- accepted
	Neoraimondia macrostibas Britton & Rose -- not accepted
	Neorudolphia Britton -- accepted
	Neorudolphia volubilis (Willd.) Britton -- accepted -- bejuco de alambre
	Neovriesia macrostachya (Bello) Britton -- not accepted
	Neptunia palmeri Britton & Rose -- not accepted
	Nidema Britton & Millsp. -- accepted
	Nidema ottonis (Rchb. f.) Britton & Millsp. -- accepted -- fairy orchid
	Niopa peregrina (L.) Britton & Rose -- not accepted
	Nopalea gaumeri Britton & Rose -- not accepted
	Nopalxochia Britton & Rose -- not accepted
	Nopalxochia phyllanthoides (DC.) Britton & Rose -- not accepted
	Norta altissima (L.) Britton -- not accepted
	Norta irio (L.) Britton -- not accepted
	Nothoscordum bivalve (L.) Britton -- accepted -- crowpoison
	Nyctelea nyctelea (L.) Britton -- not accepted
	Nyctocereus (A. Berger) Britton & Rose -- not accepted
	Nyctocereus guatemalensis Britton & Rose -- not accepted
	Nyctocereus hirschtianus (K. Schum.) Britton & Rose -- not accepted
	Nyctocereus neumannii (K. Schum.) Britton & Rose -- not accepted
	Nyctocereus oaxacensis Britton & Rose -- not accepted
	Nyctocereus serpentinus (Lag. & Rodr.) Britton & Rose -- not accepted
	Nymphoides nymphaeoides (L.) Britton -- not accepted
	Ocotea coriacea (Sw.) Britton -- not accepted -- lancewood
	Oenothera grandis (Britton) Smyth -- accepted -- largeflower eveningprimrose, showy evening primrose, showy evening-primrose, showy eveningprimrose
	Oncidium bahamense Nash ex Britton & Millsp. -- not accepted
	Oncophorus strumulosus (M�ll. Hal. & Kindb.) E. Britton -- not accepted
	Ophioglossum vulgatum var. alaskanum (E.G. Britton) C. Chr. -- not accepted
	Opuntia abjecta Small ex Britton & Rose -- not accepted
	Opuntia alexanderi Britton & Rose -- not accepted
	Opuntia antillana Britton & Rose -- not accepted
	Opuntia bahiensis Britton & Rose -- not accepted
	Opuntia bella Britton & Rose -- not accepted
	Opuntia boldinghii Britton & Rose -- accepted
	Opuntia boringuensis Britton & Rose -- not accepted
	Opuntia borinquensis Britton & Rose -- accepted -- olaga
	Opuntia brasiliensis ssp. bahiensis (Britton & Rose) P.J. Braun & Esteves -- not accepted
	Opuntia burrageana Britton & Rose -- not accepted
	Opuntia caribaea Britton & Rose -- not accepted
	Opuntia chaffeyi Britton & Rose -- accepted
	Opuntia covillei Britton & Rose -- not accepted
	Opuntia depauperata Britton & Rose -- not accepted
	Opuntia discolor Britton & Rose -- not accepted
	Opuntia durangensis Britton & Rose -- not accepted
	Opuntia feroacantha Britton & Rose -- not accepted
	Opuntia guatemalensis Britton & Rose -- not accepted
	Opuntia haitiensis Britton -- not accepted
	Opuntia imbricata var. viridiflora (Britton & Rose) D. Weniger -- not accepted
	Opuntia jamaicensis Britton & Harris -- not accepted
	Opuntia juniperina Britton & Rose -- not accepted
	Opuntia millspaughii Britton -- not accepted
	Opuntia nashii Britton -- not accepted
	Opuntia occidentalis var. covillei (Britton & Rose) Munz -- not accepted
	Opuntia palmadora Britton & Rose -- not accepted
	Opuntia pennellii Britton & Rose -- not accepted
	Opuntia pisciformis Small ex Britton & Rose -- not accepted
	Opuntia pittieri Britton & Rose -- accepted
	Opuntia pollardii Britton & Rose -- not accepted
	Opuntia polyacantha var. juniperina (Britton & Rose) L.D. Benson -- accepted -- Juniper pricklypear
	Opuntia salvadorensis Britton & Rose -- not accepted
	Opuntia shaferi Britton & Rose -- not accepted
	Opuntia soederstromiana Britton & Rose -- accepted
	Opuntia soehrensii Britton & Rose -- not accepted
	Opuntia taylorii Britton & Rose -- accepted
	Opuntia tracyi Britton -- not accepted
	Opuntia trichophora (Engelm. & J.M. Bigelow) Britton & Rose -- not accepted -- Nopal peludito
	Opuntia vaseyi (J.M. Coult.) Britton & Rose -- not accepted
	Opuntia wetmorei Britton & Rose -- not accepted
	Opuntia whipplei var. viridiflora (Britton & Rose) L.D. Benson -- not accepted
	Opuntia wilcoxii Britton & Rose -- accepted
	Opuntia X aequatorialis Britton & Rose (pro sp.) -- accepted
	Opuntia X cubensis Britton & Rose (pro sp.) -- accepted -- bullsuckers
	Opuntia X lucayana Britton (pro sp.) -- accepted
	Opuntia X vaseyi (J.M. Coult.) Britton & Rose (pro sp.) -- accepted
	Opuntia X viridiflora Britton & Rose (pro sp.) -- not accepted -- rattail cholla, Santa Fe cholla
	Orophaca caespitosa (Nutt.) Britton -- not accepted
	Orophaca sericea (Nutt.) Britton -- not accepted
	Oroya Britton & Rose -- accepted
	Oroya peruviana (K. Schum.) Britton & Rose -- accepted
	Oryzopsis juncea Britton, Sterns & Poggenb. -- not accepted
	Osmia borinquensis Britton -- not accepted
	Osmia corymbosa (Aubl.) Britton & P. Wilson -- not accepted
	Osmia geraniifolia (Urb.) Britton & P. Wilson -- not accepted
	Osmia sinuata (Lam.) Britton & P. Wilson -- not accepted
	Osmorhiza divaricata (Britton) Suksd. -- not accepted
	Oxypolis filiformis (Walter) Britton -- accepted -- water cowbane
	Oxypolis rigidior var. longifolia (Pursh) Britton -- not accepted
	Oxytropis arctica var. bellii (Britton ex Macoun) B. Boivin -- accepted -- Bell's arctic locoweed, Bell's locoweed
	Oxytropis bellii (Britton ex Macoun) Palib. -- not accepted
	Pachycereus (A. Berger) Britton & Rose -- accepted
	Pachycereus calvus (Engelm. ex J.M. Coult.) Britton & Rose -- not accepted
	Pachycereus chrysomallus (Lem.) Britton & Rose -- not accepted
	Pachycereus columna-trajani (Karw.) Britton & Rose -- not accepted
	Pachycereus gaumeri Britton & Rose -- accepted
	Pachycereus lepidanthus (Eichlam) Britton & Rose -- accepted
	Pachycereus marginatus (DC.) Britton & Rose -- accepted
	Pachycereus pecten-aboriginum (Engelm. ex S. Watson) Britton & Rose -- accepted
	Pachycereus pringlei (S. Watson) Britton & Rose -- accepted
	Pachycereus ruficeps (F.A.C. Weber ex Rol.-Goss.) Britton & Rose -- not accepted
	Packera antennariifolia (Britton) W.A. Weber & �. L�ve -- accepted -- shale barren ragwort, shalebarren ragwort
	Packera crawfordii (Britton) A.M. Mahoney & R.R. Kowal -- accepted
	Palamocladium leskeoides (Hook.) E. Britton -- accepted
	Palicourea brevithyrsa Britton & Standl. -- not accepted
	Panicum nitidum var. pauciflorum Britton -- not accepted
	Panicum nitidum var. viride (Vasey) Britton -- not accepted
	Panicum pubescens var. barbulatum (Michx.) Britton -- not accepted
	Parakohleria sprucei (Britton ex Rusby) Wiehler -- not accepted
	Paralabatia portoricensis Britton & P. Wilson -- not accepted
	Pariti grande Britton -- not accepted
	Pariti tiliaceum (L.) A. Juss. ex Britton & Millsp. -- not accepted
	Parosela aurea (Nutt. ex Fraser) Britton -- not accepted
	Parosela dalea (L.) Britton -- not accepted
	Parosela enneandra (Nutt. ex Fraser) Britton -- not accepted
	Parosela lanata (Spreng.) Britton -- not accepted
	Parsonsia parsonsia (L.) Britton -- not accepted
	Parthenium auriculatum Britton -- not accepted
	Parthenium hispidum var. auriculatum (Britton) Rollins -- not accepted
	Parthenium integrifolium var. auriculatum (Britton) Cornelius ex Cronquist -- not accepted -- wild quinine
	Parthenocissus heptaphylla (Buckley) Britton ex Small -- accepted -- sevenleaf creeper
	Paspalum intermedium Munro ex Morong & Britton -- accepted -- intermediate paspalum
	Paurotis wrightii (Griseb. & H. Wendl.) Britton -- not accepted
	Pearcea sprucei (Britton ex Rusby) L.P. Kvist & L.E. Skog -- accepted
	Pearcea sprucei var. sprucei (Britton ex Rusby) L.P. Kvist & L.E. Skog -- accepted
	Pedilanthus grisebachii Millsp. & Britton -- not accepted
	Pedilanthus ierensis Britton -- not accepted
	Pedilanthus jamaicensis Millsp. & Britton -- not accepted
	Pedilanthus latifolius Millsp. & Britton -- not accepted
	Pedilanthus tithymaloides ssp. jamaicensis (Millsp. & Britton) Dressler -- not accepted
	Pediocactus Britton & Rose -- accepted -- hedgehog cactus
	Pediocactus simpsonii (Engelm.) Britton & Rose -- accepted -- Simpson's hedgehog cactus, snowball pediocactus
	Pediocactus simpsonii ssp. simpsonii (Engelm.) Britton & Rose -- not accepted
	Pediocactus simpsonii var. simpsonii (Engelm.) Britton & Rose -- not accepted -- Simpson hedgehog cactus, Simpson's hedgehog cactus
	Peiranisia bahamensis (Mill.) Britton & Rose -- not accepted
	Peiranisia polyphylla (Jacq.) Britton & Rose -- not accepted
	Peniocereus (A. Berger) Britton & Rose -- accepted
	Peniocereus greggii (Engelm.) Britton & Rose -- accepted -- nightblooming cereus
	Peniocereus greggii var. greggii (Engelm.) Britton & Rose -- accepted -- Gregg's nightblooming cereus
	Peniocereus guatemalensis (Britton & Rose) D.R. Hunt -- accepted
	Peniocereus johnstonii Britton & Rose -- accepted
	Peniocereus oaxacensis (Britton & Rose) D.R. Hunt -- accepted
	Peniocereus papillosus (Britton & Rose) U. Guzm�n -- not accepted
	Penstemon canescens (Britton) Britton -- accepted -- eastern gray beardtongue
	Penstemon penstemon (L.) Britton -- not accepted
	Peperomia wheeleri Britton -- accepted -- Wheeler's peperomia
	Pepo ficifolia (Bouch�) Britton -- not accepted
	Pepo foetidissima (Kunth) Britton -- not accepted
	Pepo moschata (Duchesne) Britton -- not accepted
	Pepo pepo (L.) Britton ex Small -- not accepted
	Pereskia colombiana Britton & Rose -- not accepted
	Pereskia conzattii Britton & Rose -- not accepted
	Pereskia cubensis Britton & Rose -- not accepted
	Pereskia humboldtii Britton & Rose -- not accepted
	Pereskia moorei Britton & Rose -- not accepted
	Pereskia zehntneri Britton & Rose -- not accepted
	Pereskiopsis Britton & Rose -- accepted
	Pereskiopsis aquosa (F.A.C. Weber) Britton & Rose -- accepted
	Pereskiopsis chapistle (F.A.C. Weber) Britton & Rose -- not accepted
	Pereskiopsis diguetii (F.A.C. Weber) Britton & Rose -- accepted
	Pereskiopsis opuntiiflora (DC.) Britton & Rose -- not accepted
	Pereskiopsis pititache (Karw. ex Pfeiff.) Britton & Rose -- not accepted
	Pereskiopsis porteri (Brandegee ex F.A.C. Weber) Britton & Rose -- accepted
	Pereskiopsis rotundifolia (DC.) Britton & Rose -- accepted
	Pereskiopsis scandens Britton & Rose -- not accepted
	Pereskiopsis spathulata (Otto ex Pfeiff.) Britton & Rose -- not accepted
	Perilla frutescens (L.) Britton -- accepted -- beefsteak mint, beefsteak plant, purple mint
	Perilla frutescens var. frutescens (L.) Britton -- accepted -- beefsteakplant
	Persea portoricensis Britton & P. Wilson -- not accepted
	Petasites gracilis Britton -- not accepted
	Petesioides pendula (Urb.) Britton -- not accepted
	Petesioides yunquensis (Urb.) Britton -- not accepted
	Petunia axillaris (Lam.) Britton, Sterns & Poggenb. -- accepted -- large white petunia
	Pfeiffera boliviana (Britton) D.R. Hunt -- accepted
	Pfeiffera crenata (Britton) P.V. Heath -- accepted
	Phaca americana (Hook.) Rydb. ex Britton & A. Br. -- not accepted
	Phaethusa helianthoides (Michx.) Britton -- not accepted
	Phaethusa occidentalis (L.) Britton -- not accepted
	Phaethusa virginica (L.) Britton -- not accepted
	Phaseolus polystachios (L.) Britton, Sterns & Poggenb. -- accepted -- slimleaf bean, thicket bean
	Phaseolus polystachios var. polystachios (L.) Britton, Sterns & Poggenb. -- accepted -- thicket bean
	Phaseolus polystachyus (L.) Britton, Sterns & Poggenb. -- not accepted
	Phellosperma Britton & Rose -- not accepted
	Phellosperma tetrancistra (Engelm.) Britton & Rose -- not accepted
	Philodendron nechodomi Britton -- not accepted
	Philodendron nechodomii Britton -- not accepted
	Philonotis longiseta (Michx.) E. Britton -- accepted
	Philotria angustifolia (Muhl.) Britton ex Rydb. -- not accepted
	Philotria canadensis (Michx.) Britton -- not accepted
	Phlebotaenia cowellii Britton -- accepted
	Phlox amplifolia Britton -- accepted -- largeleaf phlox
	Phlox kelseyi Britton -- accepted -- Kelsey's phlox
	Phlox kelseyi ssp. kelseyi Britton -- accepted -- Kelsey's phlox
	Phoradendron randiae (Bello) Britton -- not accepted
	Phragmites vulgaris Britton, Sterns & Poggenb. -- not accepted
	Phyllanthus cuneifolius (Britton) Croizat -- accepted -- wedge leaf-flower
	Phymosia cuspidata (A. Gray) Britton -- not accepted
	Phymosia remota (Greene) Britton -- not accepted
	Physalis ambigua (A. Gray) Britton -- not accepted
	Physalodes physalodes (L.) Britton -- not accepted
	Physcomitrium australe E. Britton -- not accepted
	Physcomitrium californicum E. Britton -- not accepted
	Physcomitrium coloradense E. Britton -- not accepted
	Physcomitrium drummondii E. Britton -- not accepted
	Physcomitrium kellermanii E. Britton -- not accepted
	Physcomitrium kellermanii var. drummondii (E. Britton) Grout -- not accepted
	Physcomitrium megalocarpum var. californicum (E. Britton) Grout -- not accepted
	Physcomitrium turbinatum (Michx.) E. Britton -- not accepted
	Physcomitrium turbinatum f. australe (E. Britton) Grout -- not accepted
	Physcomitrium turbinatum var. langloisii (Renauld & Cardot) E. Britton -- not accepted
	Physostegia denticulata sensu Fernald, non (Aiton) Britton -- not accepted
	Physostegia denticulata (Aiton) Britton -- not accepted
	Physostegia nuttallii (Britton) Fassett -- not accepted
	Picea canadensis (Mill.) Britton, Sterns & Poggenb. -- not accepted
	Picea mariana (Mill.) Britton, Sterns & Poggenb. -- accepted -- black spruce, bog spruce, shortleaf black spruce, swamp spruce
	Picea mariana var. mariana (Mill.) Britton, Sterns & Poggenb. -- not accepted -- black spruce
	Picradenia odorata (DC.) Britton -- not accepted
	Picradeniopsis Rydb. ex Britton -- accepted -- bahia
	Picradeniopsis oppositifolia (Nutt.) Rydb. ex Britton -- accepted -- opposite-leaf false bahia, oppositeleaf bahia, plains bahia
	Pilea margarettae Britton -- accepted -- Margarett's clearweed
	Pilea margarettiae Britton -- not accepted -- Margarett's clearweed
	Pilea yunquensis (Urb.) Britton & P. Wilson -- accepted -- mountain clearweed
	Pilosocereus bahamensis (Britton) Byles & G.D. Rowley -- not accepted
	Pilosocereus barbadensis (Britton & Rose) Byles & G.D. Rowley -- not accepted
	Pilosocereus brasiliensis (Britton & Rose) Backeb. -- accepted
	Pilosocereus brasiliensis ssp. brasiliensis (Britton & Rose) Backeb. -- accepted
	Pilosocereus brooksianus (Britton & Rose) Byles & G.D. Rowley -- not accepted
	Pilosocereus collinsii (Britton & Rose) Byles & G.D. Rowley -- accepted
	Pilosocereus gaumeri (Britton & Rose) Backeb. -- not accepted
	Pilosocereus gounellei ssp. zehntneri (Britton & Rose) Zappi -- accepted
	Pilosocereus keyensis (Britton & Rose) Byles & G.D. Rowley -- not accepted
	Pilosocereus millspaughii (Britton) Byles & G.D. Rowley -- not accepted
	Pilosocereus purpusii (Britton & Rose) Byles & G.D. Rowley -- accepted
	Pilosocereus tweedyanus (Britton & Rose) Byles & G.D. Rowley -- accepted
	Pilosocereus zehnteri (Britton & Rose) F. Ritter -- not accepted
	Piper treleaseanum Britton & P. Wilson -- not accepted
	Pisonia albida (Heimerl) Britton ex Standl. -- accepted -- corcho bobo
	Pisonia floridana Britton -- not accepted -- Rock Key devil's-claws
	Pithecellobium carbonarium (Britton) Niezgoda & Nevling -- not accepted
	Pithecellobium keyense Coker ex Britton -- accepted -- Florida Keys blackbead
	Platyopuntia discolor (Britton & Rose) F. Ritter -- not accepted
	Platyopuntia soehrensii (Britton & Rose) F. Ritter -- not accepted
	Pleurothallis crassipes sensu Britton & P. Wilson, non Lindl. -- not accepted
	Pleuroziopsis Kindb. ex E. Britton -- accepted
	Pleuroziopsis ruthenica (Weinm.) Kindb. ex E. Britton -- accepted
	Plinia sintenisii (Kiaersk.) Britton -- not accepted
	Poincianella Britton & Rose -- accepted
	Poincianella mexicana (A. Gray) Britton & Rose -- accepted -- Mexican holdback, Mexican poinciana
	Poincianella myabensis (Britton) Britton & Rose -- accepted
	Polemonium caeruleum ssp. vanbruntiae (Britton) J.F. Davidson -- not accepted
	Polemonium van-bruntiae Britton -- not accepted
	Polemonium vanbruntiae Britton -- accepted -- Jacob's ladder, pol�moine de Van-Brunt, Vanbrunt's polemonium
	Polygala cowellii (Britton) S.F. Blake -- not accepted -- palo de violeta, violet tree
	Polygala penaea ssp. portoricensis (Britton) Gillis -- not accepted -- crevajosa
	Polygala portoricensis (Britton) S.F. Blake -- not accepted
	Polygala tweedyi Britton ex Wheelock -- not accepted
	Polystachya minuta (Aubl.) Britton -- not accepted
	Pomaria wootonii (Britton) B.B. Simpson -- accepted -- Wooton's holdback
	Poponax macracanthoides (Bertero ex DC.) Britton & Rose -- not accepted
	Populus cercidiphylla Britton -- not accepted
	Populus occidentalis (Rydb.) Britton ex Rydb. -- not accepted
	Populus tremuloides var. cercidiphylla (Britton) Sudw. -- not accepted
	Populus tweedyi Britton -- not accepted
	Porteranthus Britton -- not accepted -- porteranthus
	Porteranthus stipulatus (Muhl. ex Willd.) Britton -- not accepted -- Indian physic
	Porteranthus trifoliatus (L.) Britton -- not accepted -- Bowman's root
	Portulaca caulerpoides Britton & P. Wilson ex Britton -- accepted -- Puerto Rico purslane
	Praecereus euchlorus ssp. diffusus (Britton & Rose) N.P. Taylor -- accepted
	Praecereus euchlorus ssp. smithianus (Britton & Rose) N.P. Taylor -- accepted
	Praecereus maritimus (Britton & Rose) Buxb. -- not accepted
	Praecereus smithianus (Britton & Rose) Buxb. -- not accepted
	Pseudoacanthocereus brasiliensis (Britton & Rose) F. Ritter -- accepted
	Pseudocryphaea E. Britton ex Broth. -- accepted
	Pseudocryphaea flagellifera (Brid.) E. Britton -- not accepted
	Pseudognaphalium helleri (Britton) Anderb. -- accepted -- Heller's cudweed
	Pseudognaphalium helleri ssp. helleri (Britton) Anderb. -- accepted -- Heller's cudweed
	Pseudolobivia aurea (Britton & Rose) Backeb. -- not accepted
	Pseudolobivia ferox (Britton & Rose) Backeb. -- not accepted
	Pseudolobivia longispina (Britton & Rose) Backeb. ex Krainz -- not accepted
	Pseudophoenix vinifera sensu Britton & Millsp., non (Mart.) Becc. -- not accepted
	Pseudopilocereus zehntneri (Britton & Rose) P.V. Heath -- not accepted
	Pseudorhipsalis Britton & Rose -- accepted
	Pseudorhipsalis alata (Sw.) Britton & Rose -- accepted
	Pseudorhipsalis amazonica ssp. panamensis (Britton & Rose) Ralf Bauer -- accepted
	Pseudorhipsalis himantoclada (Rol.-Goss.) Britton & Rose -- accepted
	Pseudorhipsalis ramulosa ssp. jamaicensis (Britton & Harris) Doweld -- accepted
	Pseudotsuga taxifolia (Lamb.) Britton -- not accepted
	Psiguria cookiana (Britton) -- not accepted -- algodoncillo
	Psilocarya corymbifera (C. Wright) Britton -- not accepted
	Psilocarya portoricensis Britton -- not accepted
	Pterocactus fischeri Britton & Rose -- accepted
	Pterocactus hickenii Britton & Rose -- accepted
	Pterocactus pumilus Britton & Rose -- not accepted
	Pterocactus skottsbergii (Britton & Rose) Backeb. -- not accepted
	Pterocactus tuberosus (Pfeiff.) Britton & Rose -- accepted
	Ptilimnium nuttallii (DC.) Britton -- accepted -- laceflower, Nuttall's mockbishopweed
	Pulsatilla hirsutissima (Pursh) Britton -- not accepted
	Pycnanthemum flexuosum auct. non (Walter) Britton, Sterns & Poggenb. -- not accepted -- Appalachian mountainmint
	Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenb. -- accepted -- Appalachian mountainmint
	Pyrus arbutifolia var. atropurpurea (Britton) B.L. Rob. -- not accepted
	Quamasia hyacinthina (Raf.) Britton -- not accepted
	Quamoclit quamoclit (L.) Britton -- not accepted
	Quercus alexanderi Britton -- not accepted
	Quercus schneckii Britton -- not accepted
	Quercus shumardii var. schneckii (Britton) Sarg. -- not accepted -- Schneck's oak
	Quercus X rudkinii Britton (pro sp.) -- accepted -- Rudkin's oak
	Quiabentia Britton & Rose -- accepted
	Quiabentia zehntneri (Britton & Rose) Britton & Rose -- accepted
	Radicula hispida (Desv.) Britton -- not accepted
	Radicula portoricensis (Spreng.) Britton -- not accepted
	Raimannia grandis (Britton) Rose -- not accepted
	Randia portoricensis (Urb.) Britton & Standl. -- accepted -- Puerto Rico indigoberry
	Ranunculus allegheniensis Britton -- accepted -- Allegheny Mountain buttercup
	Ranunculus aquatilis var. porteri (Britton) L.D. Benson -- not accepted
	Ranunculus gelidus ssp. grayi (Britton) Hult�n -- not accepted
	Ranunculus grayi Britton -- accepted -- wetslope buttercup
	Ranunculus harveyi (A. Gray) Britton -- accepted -- Harvey's buttercup
	Ranunculus harveyi var. harveyi (A. Gray) Britton -- accepted -- Harvey's buttercup
	Ranunculus macounii Britton -- accepted -- Macoun's buttercup
	Rathbunia Britton & Rose -- not accepted
	Rathbunia alamosensis (J.M. Coult.) Britton & Rose -- not accepted
	Rathbunia kerberi (K. Schum.) Britton & Rose -- not accepted
	Rathbunia sonorensis (Runge ex K. Schum.) Britton & Rose -- not accepted
	Rebutia deminuta (F.A.C. Weber) Britton & Rose -- accepted
	Rebutia deminuta ssp. deminuta (F.A.C. Weber) Britton & Rose -- accepted
	Rebutia fiebrigii (G�rke) Britton & Rose -- accepted
	Rebutia pseudominuscula (Speg.) Britton & Rose -- not accepted
	Rebutia pygmaea (R.E. Fr.) Britton & Rose -- accepted
	Rebutia steinmannii (Solms) Britton & Rose -- accepted
	Rheedia hessii Britton -- not accepted
	Rhexia aristosa Britton -- accepted -- awned meadowbeauty, awnpetal meadowbeauty
	Rhipsalidopsis Britton & Rose -- not accepted
	Rhipsalidopsis rosea (Lagerh.) Britton & Rose -- not accepted
	Rhipsalis baccifera ssp. shaferi (Britton & Rose) Barthlott & N.P. Taylor -- accepted
	Rhipsalis boliviana (Britton) Lauterb. ex Buchtien -- not accepted
	Rhipsalis burchellii Britton & Rose -- accepted
	Rhipsalis crenata (Britton) Vaupel -- not accepted
	Rhipsalis cuneata Britton & Rose -- accepted
	Rhipsalis floccosa ssp. pittieri (Britton & Rose) Barthlott & N.P. Taylor -- accepted
	Rhipsalis heteroclada Britton & Rose -- not accepted
	Rhipsalis jamaicensis Britton & Harris -- not accepted
	Rhipsalis loefgrenii Britton & Rose -- not accepted
	Rhipsalis pittieri Britton & Rose -- not accepted
	Rhipsalis russellii Britton & Rose -- accepted
	Rhipsalis shaferi Britton & Rose -- not accepted
	Rhodiola integrifolia ssp. neomexicana (Britton) H. Ohba -- accepted -- New Mexican stonecrop
	Rhodiola integrifolia ssp. neomexicana (Britton) Kartesz -- not accepted
	Rhodiola neomexicana Britton -- not accepted
	Rhodiola roanensis Britton -- not accepted
	Rhodocactus colombianus (Britton & Rose) F.M. Knuth -- not accepted
	Rhodocactus cubensis (Britton & Rose) F.M. Knuth -- not accepted
	Rhus glabra var. borealis Britton, non Rhus borealis Greene -- not accepted
	Rhus lanceolata (A. Gray) Britton -- not accepted -- prairie sumac
	Rhynchospora axillaris (Lam.) Britton -- not accepted
	Rhynchospora bahamensis Britton -- not accepted
	Rhynchospora blauneri Britton -- not accepted
	Rhynchospora borinquensis Britton -- not accepted
	Rhynchospora bruneri Britton -- not accepted
	Rhynchospora cephalantha var. microcephala (Britton) K�k. -- not accepted -- bunched beaksedge
	Rhynchospora corymbosa (L.) Britton -- accepted -- matamat
	Rhynchospora curtissii Britton -- accepted -- Curtiss' beaksedge
	Rhynchospora earlei Britton -- not accepted
	Rhynchospora edisoniana Britton ex Small -- not accepted
	Rhynchospora floridensis (Britton) H. Pfeiff. -- accepted -- Florida whitetop
	Rhynchospora globularis var. pinetorum (Britton & Small) Gale -- accepted -- globe beaksedge
	Rhynchospora glomerata var. leptocarpa Chapm. ex Britton -- not accepted
	Rhynchospora glomerata var. minor Britton -- not accepted
	Rhynchospora intermedia (Chapm.) Britton -- not accepted -- pine barren beaksedge, pinebarren beaksedge
	Rhynchospora jamaicensis Britton -- accepted -- Jamaican beaksedge
	Rhynchospora leptocarpa (Chapm. ex Britton) Small -- not accepted -- slender-fruit beaksedge
	Rhynchospora lindeniana var. bahamensis (Britton) Gale -- accepted -- Bahama beaksedge
	Rhynchospora luquillensis Britton -- not accepted
	Rhynchospora macra (C.B. Clarke ex Britton) Small -- accepted -- large beaksedge
	Rhynchospora microcephala (Britton) Britton -- accepted -- smallhead beaksedge
	Rhynchospora mixta Britton -- accepted -- mingled beaksedge
	Rhynchospora perplexa Britton -- accepted -- pineland beaksedge
	Rhynchospora perplexa var. perplexa Britton -- not accepted -- pineland beaksedge
	Rhynchospora pinetorum Britton & Small -- not accepted
	Rhynchospora planckii Britton -- not accepted
	Rhynchospora plankii Britton -- not accepted
	Rhynchospora smallii Britton -- not accepted
	Rhynchospora tracyi Britton -- accepted -- Tracy's beaksedge
	Rhytidophyllum earlei (Urb. & Britton) C.V. Morton -- not accepted
	Ribes aureum var. gracillimum (Coville & Britton) Jeps. -- accepted -- golden currant
	Ribes gracillimum Coville & Britton -- not accepted
	Ricinella ricinella (L.) Britton & P. Wilson -- not accepted
	Ridan alternifolia (L.) Britton -- not accepted
	Ritterocereus eichlamii (Britton & Rose) Backeb. -- not accepted
	Rorippa americana (A. Gray) Britton -- not accepted
	Rorippa curvisiliqua (Hook.) Bessey ex Britton -- accepted -- curvepod yellowcress
	Rorippa curvisiliqua var. curvisiliqua (Hook.) Bessey ex Britton -- not accepted -- curvepod yellowcress
	Rorippa hispida (Desv.) Britton -- not accepted
	Rorippa obtusa (Nutt.) Britton -- not accepted
	Rorippa obtusa var. alpina (S. Watson) Britton -- not accepted
	Rorippa palustris var. williamsii (Britton) Hult�n -- not accepted
	Rorippa sphaerocarpa (A. Gray) Britton -- accepted -- round-fruit yellowcress, roundfruit yellowcress
	Rubus americanus (Pers.) Britton -- not accepted
	Rubus baileyanus Britton -- not accepted -- Bailey's dewberry
	Rubus invisus (L.H. Bailey) Britton -- not accepted -- upland dewberry
	Ruellia parviflora (Nees) Britton -- not accepted
	Ruellia strepens var. micrantha (Engelm. & A. Gray) Britton -- not accepted
	Sabatia dodecandra (L.) Britton, Sterns & Poggenb. -- accepted -- marsh rose gentian, marsh rosegentian
	Sabatia dodecandra var. dodecandra (L.) Britton, Sterns & Poggenb. -- accepted -- marsh rose gentian
	Sabatia simulata Britton -- not accepted
	Salix bonplandiana var. toumeyi (Britton & Shafer) C.K. Schneid. -- not accepted
	Salix toumeyi Britton & Shafer -- not accepted
	Salix vallicola (Dudley) Britton & Shafer -- not accepted
	Salvia carnosa ssp. mearnsii (Britton) Epling -- not accepted
	Salvia dorrii ssp. mearnsii (Britton) E.M. McClint. -- accepted -- Mearn sage, purple sage, Verde Valley sage
	Sarcomphalus taylorii Britton -- not accepted
	Savia bahamensis Britton -- not accepted -- Bahama maidenbush, maidenbush
	Saxifraga michauxii Britton -- not accepted -- Michaux's saxifrage
	Schefflera gleasonii (Britton & P. Wilson) Alain -- accepted -- yuquilla
	Schlegelia portoricensis (Urb.) Britton -- not accepted
	Schlumbergera gaertneri (Regel) Britton & Rose -- not accepted
	Schlumbergera russelliana (Hook.) Britton & Rose -- accepted
	Schobera angiosperma (Murray) Britton -- not accepted
	Schoenoplectus novae-angliae (Britton) M.T. Strong -- not accepted -- New England bulrush
	Schoenoplectus pungens var. longispicatus (Britton) S.G. Sm. -- accepted -- common threesquare
	Schoepfia arenaria Britton -- accepted -- arana
	Schrankia hystricina (Small ex Britton & Rose) Standl. -- not accepted
	Schrankia nuttalii var. hystricina (Small ex Britton & Rose) Isley -- not accepted
	Schrankia nuttallii (DC. ex Britton & Rose) Standl. -- not accepted
	Schrankia nuttallii var. hystricina (Small ex Britton & Rose) Isely -- not accepted
	Schrankia nuttallii var. nuttallii (DC. ex Britton & Rose) Standl. -- not accepted -- Nuttall's sensitive briar
	Sciacassia siamea (Lam.) Britton -- not accepted
	Scirpus americanus var. longispicatus Britton -- not accepted
	Scirpus atrovirens var. pallidus Britton -- not accepted
	Scirpus congdonii Britton -- accepted -- Congdon's bulrush
	Scirpus cylindricus (Torr.) Britton -- not accepted
	Scirpus nanus var. anachaetus (Torr.) Britton -- not accepted
	Scirpus novae-angliae Britton -- not accepted
	Scirpus pacificus Britton -- not accepted
	Scirpus pallidus (Britton) Fernald -- accepted -- cloaked bulrush, pale bulrush
	Scirpus pungens var. longispicatus (Britton) Roy L. Taylor & MacBryde -- not accepted
	Scirpus robustus var. novae-angliae (Britton) Beetle -- not accepted
	Scirpus X peckii Britton (pro sp.) -- accepted -- Peck's bulrush
	Scleria ciliata var. curtissii (Britton) J.W. Kessler -- not accepted
	Scleria costata (Britton) Small -- not accepted
	Scleria curtissii Britton -- accepted -- Curtiss' nutrush
	Scleria doradoensis Britton -- not accepted
	Scleria havanensis Britton -- accepted -- Havana nutrush
	Scleria pauciflora var. curtissii (Britton) Fairey -- not accepted -- Curtiss' nutrush
	Scleria reticularis var. pubescens Britton -- not accepted
	Scleria reticularis var. pumila Britton -- not accepted
	Scleria stevensiana Britton -- not accepted
	Scleria triglomerata var. minor Britton -- not accepted -- slender nutrush
	Sclerocactus Britton & Rose -- accepted -- fishhook cactus
	Sclerocactus polyancistrus (Engelm. & J.M. Bigelow) Britton & Rose -- accepted -- Mohave fishhook cactus, Mojave fishhook cactus, redspined fishhook cactus
	Sclerocactus whipplei (Engelm. & J.M. Bigelow) Britton & Rose -- accepted -- Whipple's fishhook cactus
	Sclerocactus whipplei ssp. whipplei (Engelm. & J.M. Bigelow) Britton & Rose -- not accepted
	Sclerocactus whipplei var. whipplei (Engelm. & J.M. Bigelow) Britton & Rose -- not accepted -- Whipple's fishhook cactus
	Sclerolepis uniflora (Walter) Britton, Sterns & Poggenb. -- accepted -- pink bogbutton
	Scouleria marginata E. Britton -- accepted -- marginate splashzone moss
	Scutellaria bushii Britton -- accepted -- Bush's skullcap
	Sebesten rickseckeri (Millsp.) Britton -- not accepted
	Sebesten sebestena (L.) Britton ex Small -- not accepted
	Sedella Britton & Rose -- accepted -- mock stonecrop
	Sedella congdonii (Eastw.) Britton & Rose -- not accepted -- Congdon's mock stonecrop
	Sedella pumila (Benth.) Britton & Rose -- accepted -- Sierra mock stonecrop
	Sedum cockerellii Britton -- accepted -- Cockerell's stonecrop
	Sedum eastwoodiae (Britton) A. Berger -- not accepted -- Red Mountain stonecrop
	Sedum integrifolium ssp. neomexicanum (Britton) R.T. Clausen -- not accepted -- New Mexican stonecrop
	Sedum integrifolium var. neomexicana (Britton) R.T. Clausen -- not accepted
	Sedum laxum (Britton) A. Berger -- accepted -- roseflower stonecrop
	Sedum laxum ssp. eastwoodiae (Britton) R.T. Clausen -- not accepted
	Sedum laxum ssp. laxum (Britton) A. Berger -- not accepted -- roseflower stonecrop
	Sedum laxum var. eastwoodiae (Britton) H. Ohba -- accepted -- Red Mountain stonecrop
	Sedum laxum var. laxum (Britton) A. Berger -- accepted -- roseflower stonecrop
	Sedum leibergii Britton -- accepted -- Leiberg stonecrop
	Sedum mexicanum Britton -- accepted -- Mexican stonecrop
	Sedum rosea var. roanense (Britton) A. Berger -- not accepted
	Sedum rosea var. roanensis (Britton) A. Berger -- not accepted
	Sedum roseum var. roanense (Britton) A. Berger -- not accepted
	Sedum smallii (Britton ex Small) H.E. Ahles -- not accepted
	Sedum spathulifolium ssp. anomalum (Britton) R.T. Clausen & Uhl -- not accepted
	Sedum spathulifolium ssp. pruinosum (Britton) R.T. Clausen & Uhl -- not accepted -- broadleaf stonecrop
	Sedum spathulifolium ssp. yosemitense (Britton) R.T. Clausen -- not accepted -- Yosemite stonecrop
	Sedum spathulifolium var. pruinosum (Britton) B. Boivin -- accepted -- broadleaf stonecrop
	Sedum wootonii Britton -- not accepted
	Sedum yosemitense Britton -- not accepted
	Selenicereus (A. Berger) Britton & Rose -- accepted -- moonlight cactus
	Selenicereus boeckmanni (Otto ex Salm-Dyck) Britton & Rose -- not accepted
	Selenicereus boeckmannii (Otto ex Salm-Dyck) Britton & Rose -- not accepted
	Selenicereus brevispinus Britton & Rose -- not accepted
	Selenicereus coniflorus (Weing.) Britton & Rose -- not accepted -- coneflower moonlight cactus, Pitayita-noctirna de culebra
	Selenicereus donkelaarii (Salm-Dyck) Britton & Rose -- not accepted
	Selenicereus grandiflorus (L.) Britton & Rose -- accepted -- Pitayita-nocturna reina de la noche, queen of the night
	Selenicereus grandiflorus ssp. grandiflorus (L.) Britton & Rose -- accepted
	Selenicereus hamatus (Scheidw.) Britton & Rose -- accepted
	Selenicereus hondurensis (K. Schum. ex Weing) Britton & Rose -- not accepted
	Selenicereus inermis (Otto) Britton & Rose -- accepted
	Selenicereus kunthianus (hort. ex Salm-Dyck) Britton & Rose -- not accepted
	Selenicereus macdonaldiae (Hook.) Britton & Rose -- not accepted
	Selenicereus murrillii Britton & Rose -- accepted
	Selenicereus nelsonii (Weing.) Britton & Rose -- accepted
	Selenicereus pteranthus (Link ex A. Dietr.) Britton & Rose -- accepted -- Pitayita-nocturna flor de la noche, princess of the night
	Selenicereus spinulosus (DC.) Britton & Rose -- accepted -- nightblooming cereus, Pitayita-nocturna espinosa, vinelike moonlight cactus
	Selenicereus urbanianus (G�rke & Weing.) Britton & Rose -- not accepted
	Selenicereus vagans (Brandegee) Britton & Rose -- accepted
	Selenicereus wercklei (F.A.C. Weber) Britton & Rose -- not accepted
	Sematophyllum adnatum (Michx.) E. Britton -- accepted
	Sematophyllum carolinianum (M�ll. Hal.) E. Britton -- not accepted
	Sematophyllum marylandicum (M�ll. Hal.) E. Britton -- accepted -- Maryland sematophyllum moss
	Sematophyllum marylandicus (M�ll. Hal.) E. Britton -- not accepted
	Sematophyllum novae-caesareae (Austin) E. Britton -- not accepted
	Sematophyllum subpinnatum (Brid.) E. Britton -- accepted
	Senecio alabamensis Britton ex Small -- not accepted
	Senecio antennariifolius Britton -- not accepted -- shalebarren ragwort
	Senecio balsamitae var. crawfordii (Britton) Greenm. -- not accepted
	Senecio crawfordii Britton -- not accepted
	Senecio discoideus (Hook.) Britton -- not accepted
	Senecio hallii Britton -- not accepted
	Senecio memmingeri Britton -- not accepted
	Senecio obovatus var. rotundus Britton -- not accepted
	Senecio pauperculus var. crawfordii (Britton) T.M. Barkley -- not accepted
	Senecio rotundus (Britton) Small -- not accepted
	Senecio smallii Britton -- not accepted
	Senecioides cinerea (L.) Kuntze ex Britton & P. Wilson -- not accepted
	Senegalia angustifolia (Lam.) Britton & Rose -- accepted
	Senegalia berlandieri (Benth.) Britton & Rose -- accepted -- guajillo
	Senegalia emoryana (Benth.) Britton & Rose -- not accepted
	Senegalia greggii (A. Gray) Britton & Rose -- accepted -- catclaw acacia
	Senegalia muricata (L.) Britton & Rose -- accepted -- spineless wattle
	Senegalia riparia (Kunth) Britton & Rose -- accepted
	Senegalia roemerana (Scheele) Britton & Rose -- not accepted
	Senegalia roemeriana (Scheele) Britton & Rose -- accepted -- roundflower catclaw
	Senegalia vogeliana (Steud.) Britton & Rose -- accepted -- macata bourse bastard
	Senegalia westiana (DC.) Britton & Rose -- not accepted
	Senegalia wrightii (Benth.) Britton & Rose -- not accepted
	Senna orcuttii (Britton & Rose) H.S. Irwin & Barneby -- accepted -- Orcutt's senna, Orcutt's wild sensitive plant
	Sericocarpus asteroides (L.) Britton, Sterns & Poggenb. -- accepted -- toothed whitetop aster
	Sericocarpus linifolius (L.) Britton, Sterns & Poggenb. -- accepted -- narrowleaf whitetop aster
	Sesban emerus (Aubl.) Britton & P. Wilson -- not accepted
	Sesuvium maritimum (Walter) Britton, Sterns & Poggenb. -- accepted -- annual seapurslane, slender seapurslane
	Sida humilis sensu Britton & P. Wilson -- not accepted
	Sideranthus grindelioides (Nutt.) Britton -- not accepted
	Silene menziesii ssp. williamsii (Britton) Hult�n -- not accepted -- Menzies' campion
	Silene menziesii var. williamsii (Britton) B. Boivin -- not accepted
	Silene williamsii Britton -- accepted -- Williams's catchfly
	Soehrensia bruchii (Britton & Rose) Backeb. -- not accepted
	Solanum bolivianum Britton ex Rusby -- accepted
	Solanum capillipes Britton -- accepted
	Solanum hazenii Britton -- accepted
	Solanum moense Britton & Wilson -- accepted
	Solidago caroliniana (L.) Britton, Sterns & Poggenb. -- not accepted
	Solidago juncea var. ramosa Porter & Britton -- not accepted
	Solidago petiolaris var. wardii (Britton) Fernald -- not accepted
	Solidago randii (Porter) Britton -- not accepted
	Solidago wardii Britton -- not accepted
	Solisia Britton & Rose -- not accepted
	Solisia pectinata (Stein) Britton & Rose -- not accepted
	Sophia sophia (L.) Britton -- not accepted
	Sorbus arbutifolia var. atropurpurea (Britton) C.K. Schneid. -- not accepted
	Spathiger ramosus (Jacq.) Britton -- not accepted
	Spathularia michauxii (Britton) Small -- not accepted
	Spatularia michauxii (Britton) Small -- not accepted
	Sphaeralcea cuspidata (A. Gray) Britton -- not accepted
	Spiraea rubra (Hill) Britton -- not accepted
	Spiraea virginiana Britton -- accepted -- Virginia meadowsweet, Virginia spiraea
	Spiraea virginiana var. virginiana Britton -- not accepted -- Virginia meadowsweet
	Spiranthes lucayana (Britton) Cogn. -- not accepted -- green ladiestresses
	Stachys ambigua (A. Gray) Britton -- not accepted
	Stachys arenicola Britton -- not accepted
	Stachys atlantica Britton -- not accepted
	Stachys latidens Small ex Britton -- accepted -- broadtooth hedgenettle
	Stachys palustris ssp. arenicola (Britton) Gill -- not accepted -- marsh hedgenettle
	Stachys pilosa var. arenicola (Britton) G.A. Mulligan & D.B. Munro -- accepted -- hairy hedgenettle
	Stachys tenuifolia var. latidens (Small ex Britton) J.B. Nelson -- not accepted -- smooth hedgenettle
	Stanleya pinnata (Pursh) Britton -- accepted -- desert prince's-plume, golden prince's-plume
	Stanleya pinnata var. pinnata (Pursh) Britton -- accepted -- desert princesplume, golden prince's-plume, pinnate princesplume
	Stenocactus lloydii (Britton & Rose) A. Berger -- not accepted
	Stenocereus eichlamii (Britton & Rose) Buxb. -- accepted
	Stenocereus humilis (Britton & Rose) D.R. Hunt -- accepted
	Stenocereus longispinus (Britton & Rose) Buxb. -- not accepted
	Stenocereus montanus (Britton & Rose) Buxb. -- accepted
	Stenophyllus barbatus (Rottb.) Britton -- not accepted
	Stenophyllus capillaris (L.) Britton -- not accepted
	Stenophyllus carteri Britton ex Small -- not accepted
	Stenophyllus coarctatus (Elliott) Britton -- not accepted
	Stenophyllus curassavicus Britton -- not accepted
	Stenophyllus portoricensis Britton -- not accepted
	Stenophyllus stenophyllus (Elliott) Britton -- not accepted
	Stenophyllus warei (Torr.) Britton -- not accepted
	Stenostomum obtusifolium (Urb.) Britton & P. Wilson -- accepted
	Stenostomum portoricense Britton & P. Wilson -- accepted
	Stenostomum sintenisii (Urb.) Britton & P. Wilson -- accepted
	Stethoma comata (L.) Britton -- not accepted
	Stethoma verticillaris (Nees) Britton -- not accepted
	Stetsonia Britton & Rose -- accepted
	Stetsonia coryne (Salm-Dyck) Britton & Rose -- accepted
	Strombocactus Britton & Rose -- accepted
	Strombocactus disciformis (DC.) Britton & Rose -- accepted
	Strombocactus disciformis ssp. disciformis (DC.) Britton & Rose -- accepted
	Strophocactus Britton & Rose -- accepted
	Strophocactus wittii (K. Schum.) Britton & Rose -- accepted
	Strophostyles helvula var. missouriensis (S. Watson) Britton -- not accepted
	Strophostyles umbellata (Muhl. ex Willd.) Britton -- accepted -- perennial wildbean, pink fuzzybean
	Stylophyllum edule (Nutt.) Britton & Rose -- not accepted
	Stylophyllum parishii Britton -- not accepted
	Stylophyllum viscidum (S. Watson) Britton & Rose -- not accepted
	Stylosanthes biflora (L.) Britton, Sterns & Poggenb. -- accepted -- endbeak pencilflower, sidebeak pencilflower
	Subpilocereus grenadensis (Britton & Rose) Backeb. -- not accepted
	Sullivantia sullivantii (Torr. & A. Gray) Britton -- accepted -- Sullivant's coolwort
	Swartzia longiflora (Tussac) Britton & P. Wilson -- not accepted
	Symphyotrichum bahamense (Britton) G.L. Nesom -- not accepted -- Bahaman aster
	Symphyotrichum bracei (Britton ex Small) G.L. Nesom -- not accepted -- Brace's aster
	Symphyotrichum praealtum var. nebraskense (Britton) G.L. Nesom -- not accepted -- Nebraska aster
	Symphyotrichum priceae (Britton) G.L. Nesom -- accepted -- lavender oldfield aster
	Synadra hispidula (Michx.) Britton -- not accepted
	Synandra hispidula (Michx.) Britton -- not accepted -- Guyandotte beauty
	Syndesmon thalictroides (L.) Hoffmanns. ex Britton -- not accepted
	Synosma suaveolens (L.) Raf. ex Britton -- not accepted
	Tabebuia argentea (Bureau & K. Schum.) Britton -- not accepted
	Tabebuia heterophylla (DC.) Britton -- accepted -- white cedar
	Tabebuia lucida Britton -- not accepted
	Tacinga Britton & Rose -- accepted
	Tacinga funalis Britton & Rose -- accepted
	Tacinga palmadora (Britton & Rose) N.P. Taylor & Stuppy -- accepted
	Taonabo heptasepala (Krug & Urb.) Britton -- not accepted
	Taonabo luquillensis (Krug & Urb.) Britton -- not accepted
	Taonabo pachyphylla (Krug & Urb.) Britton -- not accepted
	Taonabo peduncularis (DC.) Britton -- not accepted
	Taonabo stahlii (Krug & Urb.) Britton -- not accepted
	Taonabo subsessilis Britton -- not accepted
	Tara spinosa (Molina) Britton & Rose -- accepted -- spiny holdback
	Tephrocactus alexanderi (Britton & Rose) Backeb. -- accepted
	Tephrocactus hickenii (Britton & Rose) Speg. -- not accepted
	Tephrocactus russellii (Britton & Rose) Backeb. -- not accepted
	Tepion alatum (L.) Britton -- not accepted
	Ternstroemia subsessilis (Britton) Kobuski -- accepted -- el yunque colorado
	Thalesia fasciculata (Nutt.) Britton -- not accepted
	Thalesia uniflora (L.) Britton -- not accepted
	Thalictrum coriaceum (Britton) Small -- accepted -- maid of the mist
	Thamnobryum leibergii (E. Britton) Renauld & Cardot -- not accepted
	Thaspium trifoliatum var. aureum (L.) Britton -- accepted -- purple meadowparsnip
	Thelesperma trifidum (Poir.) Britton -- not accepted
	Thelocactus (K. Schum.) Britton & Rose -- accepted
	Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose -- accepted -- Biznaga-pez�n bicolor, glory of Texas
	Thelocactus bicolor ssp. bicolor (Galeotti ex Pfeiff.) Britton & Rose -- accepted
	Thelocactus bicolor var. bicolor (Galeotti ex Pfeiff.) Britton & Rose -- not accepted -- glory of Texas
	Thelocactus buekii (Klein bis) Britton & Rose -- accepted
	Thelocactus hexaedrophorus (Lem.) Britton & Rose -- accepted
	Thelocactus hexaedrophorus ssp. hexaedrophorus (Lem.) Britton & Rose -- accepted
	Thelocactus hexaedrophorus ssp. lloydii (Britton & Rose) N.P. Taylor -- accepted
	Thelocactus leucacanthus (Zucc. ex Pfeiff.) Britton & Rose -- accepted
	Thelocactus leucacanthus ssp. leucacanthus (Zucc. ex Pfeiff.) Britton & Rose -- accepted
	Thelocactus rinconensis (Poselger) Britton & Rose -- accepted
	Thelocactus rinconensis ssp. rinconensis (Poselger) Britton & Rose -- accepted
	Thelocactus tulensis (Polseg.) Britton & Rose -- accepted
	Thelocactus tulensis ssp. tulensis (Polseg.) Britton & Rose -- not accepted
	Thyana portoricensis (Radlk.) Britton -- not accepted
	Thyana striata (Radlk.) Britton -- not accepted
	Thymophylla aurea (A. Gray) Greene ex Britton -- accepted -- manyawn pricklyleaf
	Thymophylla aurea var. aurea (A. Gray) Greene ex Britton -- accepted -- manyawn pricklyleaf
	Tillaeastrum aquaticum (L.) Britton -- not accepted
	Tillaeastrum drummondii (Torr. & A. Gray) Britton -- not accepted
	Tillaeastrum drummondii sensu (Torr. & A. Gray) Britton -- not accepted
	Tillaeastrum vaillantii auct. non (Willd.) Britton -- not accepted
	Tillaeastrum viride (S. Watson) Britton -- not accepted
	Tipularia unifolia Britton, Sterns & Poggenb. -- not accepted
	Tissa canadensis (Pers.) Britton -- not accepted
	Tissa marina (L.) Britton -- not accepted
	Tissa rubra (L.) Britton -- not accepted
	Tithymalus grisebachii (Millsp. & Britton) Croizat -- not accepted
	Tithymalus ierensis (Britton) Croizat -- not accepted
	Tithymalus jamaicensis (Millsp. & Britton) Croizat -- not accepted
	Tofieldia racemosa (Walter) Britton, Sterns & Poggenb. -- not accepted -- coastal false asphodel
	Tolumnia bahamensis (Nash ex Britton & Millsp.) Braem -- accepted -- variegated orchid
	Torrubia bracei Britton -- not accepted
	Torrubia discolor (Spreng.) Britton -- not accepted
	Torrubia floridana (Britton ex Small) Britton -- not accepted
	Torrubia longifolia (Heimerl) Britton -- not accepted
	Torrubia obtusata (Jacq.) Britton -- not accepted
	Toumeya Britton & Rose -- not accepted
	Toumeya papyracantha (Engelm.) Britton & Rose -- not accepted
	Toxicodendron toxicodendron (L.) Britton -- not accepted
	Tradescantia montana Shuttlw. ex Britton -- not accepted
	Tradescantia occidentalis (Britton) Smyth -- accepted -- prairie spiderwort, spiderwort
	Tradescantia occidentalis var. occidentalis (Britton) Smyth -- accepted -- prairie spiderwort
	Tradescantia subaspera var. montana (Shuttlw. ex Britton) E.S. Anderson & Woodson -- not accepted -- zigzag spiderwort
	Trema floridana Britton -- not accepted
	Trema floridanum Britton -- not accepted
	Triadenum petiolatum (Walter) Britton -- not accepted
	Tricera vahlii (Baill.) Britton -- not accepted
	Trichocereus bridgesii (Salm-Dyck) Britton & Rose -- not accepted
	Trichocereus bruchii (Britton & Rose) F. Ritter -- not accepted
	Trichocereus candicans (Gillies ex Salm-Dyck) Britton & Rose -- not accepted
	Trichocereus chiloensis (Colla) Britton & Rose -- not accepted
	Trichocereus coquimbanus (Molina) Britton & Rose -- not accepted
	Trichocereus cuzcoensis Britton & Rose -- not accepted
	Trichocereus grandis (Britton & Rose) F. Ritter -- not accepted
	Trichocereus huascha (F.A.C. Weber) Britton & Rose -- not accepted
	Trichocereus pachanoi Britton & Rose -- not accepted
	Trichocereus pasacana (F.A.C. Weber ex R�mpler) Britton & Rose -- not accepted
	Trichocereus peruvianus Britton & Rose -- not accepted
	Trichocereus schickendantzii (F.A.C. Weber) Britton & Rose -- not accepted
	Trichocereus shaferi Britton & Rose -- not accepted
	Trichocereus strigosus (Salm-Dyck) Britton & Rose -- not accepted
	Trichocereus terscheckii (J. Parm. ex Pfeiff.) Britton & Rose -- not accepted
	Trichocereus thelegonoides (Speg.) Britton & Rose -- not accepted
	Trichocereus thelegonus (F.A.C. Weber) Britton & Rose -- not accepted
	Triphora surinamensis (Lindl.) Britton -- accepted -- Hernando County noddingcaps
	Tunilla soehrensii (Britton & Rose) D.R. Hunt & Iliff -- accepted
	Typhalea fruticosa (Mill.) Britton -- not accepted
	Ulota americana var. rufescens (E. Britton) Paris -- not accepted
	Ulota hutchinsiae var. rufescens (E. Britton) Dixon -- accepted -- Hutchins' ulota moss
	Ulota nutchinsiae var. rufescens (E. Britton) Dixon -- not accepted
	Uniola laxa (L.) Britton, Sterns & Poggenb. -- not accepted
	Urechites lutea (L.) Britton -- not accepted
	Urechites luteus (L.) Britton -- not accepted
	Utahia Britton & Rose -- not accepted
	Utahia sileri (Engelm. ex J.M. Coult.) Britton & Rose -- not accepted
	Utricularia cleistogama (A. Gray) Britton -- not accepted
	Uva-Ursi uva-ursi (L.) Britton -- not accepted
	Uvularia nitida (Britton) Mack. -- not accepted
	Uvularia puberula var. nitida (Britton) Fernald -- not accepted
	Uvularia pudica var. nitida (Britton) Fernald -- not accepted
	Vaccaria vaccaria (L.) Britton -- not accepted
	Vaccinium nigrum (Alph. Wood) Britton -- not accepted
	Vachellia anegadensis (Britton) Seigler & Ebinger -- accepted -- blackbrush wattle
	Vachellia vernicosa (Britton & Rose) Seigler & Ebinger -- accepted -- viscid acacia
	Valerianoides strigosa (Vahl) Britton -- not accepted
	Vanilla vanilla (L.) Britton -- not accepted
	Varronia bellonis (Urb.) Britton -- accepted -- serpentine manjack
	Varronia rupicola (Urb.) Britton -- accepted -- Puerto Rico manjack
	Verbena canadensis (L.) Britton -- not accepted
	Verbena peruviana (L.) Britton -- not accepted
	Verbesina alternifolia (L.) Britton ex Kearney -- accepted -- wingstem
	Vernonia noveboracensis var. tomentosa (Elliot) Britton -- not accepted
	Viburnum dentatum var. venosum (Britton) Gleason -- accepted -- southern arrowwood
	Viburnum scabrellum var. venosum (Britton) McAtee -- not accepted
	Viburnum venosum Britton -- not accepted
	Vincetoxicum baldwynianum (Sweet) Britton -- not accepted
	Vincetoxicum carolinense (Jacq.) Britton -- not accepted
	Vincetoxicum hirsutum (Michx.) Britton -- not accepted
	Vincetoxicum obliquum (Jacq.) Britton -- not accepted
	Vincetoxicum shortii (A. Gray) Britton -- not accepted
	Vincetoxicum sintenisii (Schltr.) Britton -- not accepted
	Vincetoxicum stephanotrichum (Griseb.) Britton -- not accepted
	Vincetoxicum suberosum (L.) Britton -- not accepted
	Vincetoxicum variifolium (Schltr.) Britton -- not accepted
	Viola canadensis var. scariosa Porter ex Britton -- accepted -- Canadian white violet
	Viorna addisonii (Britton) Small -- not accepted
	Viorna pitcheri (Torr. & A. Gray) Britton -- not accepted
	Vitis heptaphylla (Buckley) Britton -- not accepted
	Waltheria bahamensis Britton -- accepted
	Washingtonia claytonii (Michx.) Britton -- not accepted
	Washingtonia divaricata Britton -- not accepted
	Washingtonia longistylis (Torr.) Britton -- not accepted
	Weberocereus Britton & Rose -- accepted
	Weberocereus biolleyi (F.A.C. Weber) Britton & Rose -- not accepted
	Weberocereus bradei (Britton & Rose) G.D. Rowley -- accepted
	Weberocereus panamensis Britton & Rose -- not accepted
	Weberocereus tunilla (F.A.C. Weber) Britton & Rose -- accepted
	Websteria submersa (C. Wright) Britton -- not accepted
	Weissia americana var. rufescens E. Britton -- not accepted
	Werckleocereus Britton & Rose -- not accepted
	Werckleocereus glaber (Eichlam) Britton & Rose -- not accepted
	Werckleocereus tonduzii (F.A.C. Weber) Britton & Rose -- not accepted
	Wilcoxia Britton & Rose -- not accepted
	Wilcoxia papillosa Britton & Rose -- not accepted
	Wilcoxia poselgeri (Lem.) Britton & Rose -- not accepted
	Wilcoxia striata (Brandegee) Britton & Rose -- not accepted
	Wilcoxia viperina (F.A.C. Weber) Britton & Rose -- not accepted
	Wilmattea Britton & Rose -- not accepted
	Wilmattea minutiflora (Britton & Rose) Britton & Rose -- not accepted
	Wittiocactus panamensis (Britton & Rose) Rauschert -- not accepted
	X Sorbaronia arsenii (Britton ex L. Ars�ne) G.N. Jones -- accepted -- Arsen's sorbaronia
	Xanthium commune Britton -- not accepted
	Xanthium macounii Britton -- not accepted
	Xolisma ligustrina (L.) Britton -- not accepted
	Xylophylla epiphyllantha (L.) Britton -- not accepted
	Zamia lucayana Britton -- accepted
	Zamia silicea Britton -- not accepted
	Zehntnerella Britton & Rose -- not accepted
	Zehntnerella squamulosa Britton & Rose -- not accepted
	Zizia bebbii (J.M. Coult. & Rose) Britton -- not accepted
	Ziziphus taylorii (Britton) M.C. Johnst. -- accepted -- Taylor's jujube
	Zygodon rufotomentosus E. Britton ex Malta -- not accepted
	Zygodon rupestris (Lindb. ex Hartm.) Lindb. ex E. Britton -- not accepted
	Zygodon viridissimus var. rufotomentosus (E. Britton ex Malta) Grout -- not accepted

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