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Taxon author: Nees

ITIS records citing taxon author "Nees"
 
 Kingdom Animalia
  Alysia tabida Nees, 1834 -- invalid
  Amblyaspis aliena (Nees von Esenbeck, 1834) -- valid
  Amblyaspis forticornis (Nees von Esenbeck, 1834) -- valid
  Amblyaspis nodicornis (Nees von Esenbeck, 1834) -- valid
  Aphanogmus nanus (Nees von Esenbeck, 1834) -- valid
  Aphanogmus perfoliatus (Nees von Esenbeck, 1834) -- valid
  Asobara tabida (Nees, 1834) -- valid
  Bassus affinis Nees -- invalid
  Bracon areolaris Nees -- invalid
  Ceraphron bispinosus (Nees von Esenbeck, 1834) -- valid
  Ceraphron fuscicornis (Nees von Esenbeck, 1834) -- valid
  Ceraphron hemipterus (Nees von Esenbeck, 1834) -- valid
  Ceraphron inflatus (Nees von Esenbeck, 1834) -- valid
  Chorebus affinis (Nees) -- valid
  Chorebus gracilis (Nees, 1834) -- valid
  Conostigmus cursitans (Nees von Esenbeck, 1834) -- valid
  Conostigmus fuscipes (Nees von Esenbeck, 1834) -- valid
  Conostigmus rufipes (Nees von Esenbeck, 1834) -- valid
  Conostigmus signatus (Nees von Esenbeck, 1834) -- valid
  Dacnusa areolaris (Nees) -- valid
  Dendrocerus stigma (Nees von Esenbeck, 1834) -- valid
  Eutriche Nees, 1843 -- invalid
  Gryon muscaeforme (Nees von Esenbeck, 1834) -- valid
  Gryon pedestre (Nees von Esenbeck, 1834) -- valid
  Isocybus grandis (Nees von Esenbeck, 1834) -- valid
  Isostasius punctiger (Nees von Esenbeck, 1834) -- valid
  Microgaster tibialis Nees -- valid
  Opius nitidulator (Nees, 1834) -- valid
  Phacostomus Nees, 1834 -- invalid
  Platygaster nigra Nees von Esenbeck, 1834 -- valid
  Platygaster obscura Nees von Esenbeck, 1834 -- valid
  Platygaster pyramidalis Nees von Esenbeck, 1834 -- valid
  Platygaster spinigera Nees von Esenbeck, 1834 -- valid
  Platygaster striolata Nees von Esenbeck, 1834 -- valid
  Platygaster tuberosa Nees von Esenbeck, 1834 -- valid
  Pristaulacus flagellatus (Nees von Esenbeck, 1834) -- invalid
  Pristaulacus latreilleanus (Nees von Esenbeck, 1834) -- invalid
  Prosactogaster subulata (Nees von Esenbeck, 1834) -- valid
  Sparasion tibiale Nees von Esenbeck, 1834 -- valid
  Synopeas affine (Nees von Esenbeck, 1834) -- valid
  Synopeas decurvatum (Nees von Esenbeck, 1834) -- valid
  Synopeas muticum (Nees von Esenbeck, 1834) -- valid
  Trichacis tristis (Nees von Esenbeck, 1834) -- valid
 
 Kingdom Fungi
  Achlya prolifera Nees -- accepted
  Alternaria Nees Von Esenb. Ex Fries -- accepted
  Alternaria tenuis Nees -- not accepted
 
 Kingdom Plantae
  Acanthocoleus trigonus (Nees & Mont.) Gradst. -- accepted
  Achnatherum papposum (Nees) Barkworth -- not accepted
  Achneria ampla (Nees) T. Durand & Schinz -- not accepted
  Achneria aurea var. virens (Nees) Stapf -- not accepted
  Achneria ecklonii (Nees) T. Durand & Schinz -- not accepted
  Achneria hirsuta (Nees) Stapf -- not accepted
  Achneria microphylla (Nees) T. Durand & Schinz -- not accepted
  Achneria pallida (Nees) T. Durand & Schinz -- not accepted
  Achneria tuberculata (Nees) T. Durand & Schinz -- not accepted
  Acrobolbus Nees -- accepted
  Acrobolbus surculosus (Nees) Trevis. -- accepted
  Acrobolbus wilsonii Nees -- accepted
  Acrobolbus wilsonii var. wilsonii Nees -- accepted
  Acrolejeunea arcuata (Nees) Grolle & Gradst. -- accepted
  Acrolejeunea arcuata ssp. arcuata (Nees) Grolle & Gradst. -- accepted
  Acrolejeunea fertilis (Reinw., Blume & Nees) Schiffn. -- accepted
  Acrolejeunea securifolia (Nees) Steph. -- accepted
  Acrolejeunea securifolia ssp. securifolia (Nees) Steph. -- accepted
  Acromastigum divaricatum (Nees) A. Evans ex Reimers -- accepted
  Actinocladum verticillatum (Nees) McClure ex Soderstr. -- accepted
  Adhatoda candicans Nees -- not accepted
  Adhatoda carthaginensis (Jacq.) Nees -- not accepted
  Adhatoda dipteracantha Nees -- not accepted
  Adhatoda vasica Nees -- not accepted
  Aegilops ovata var. triaristata (Willd.) Bluff ex Nees -- not accepted
  Aegopogon setifer Nees -- not accepted
  Afrachneria ampla (Nees) Adamson -- not accepted
  Afrachneria ecklonii (Nees) Adamson -- not accepted
  Agenium Nees -- accepted
  Agenium nutans Nees -- not accepted
  Agenium villosum (Nees) Pilg. -- accepted
  Agraulus brevifolius Nees ex Torr. -- not accepted
  Agropyron divergens (Nees ex Steud.) P. Candargy -- not accepted
  Agropyron divergens (Nees ex Steud.) Vasey -- not accepted
  Agropyron semicostatum (Nees ex Steud.) Nees ex Boiss. -- not accepted
  Agropyron semicostatum Nees ex Steud. -- not accepted
  Agrostis brachyphylla (Nees) Steud. -- not accepted
  Agrostis canina var. montevidensis (Spreng. ex Nees) Kuntze -- not accepted
  Agrostis conferta Nees & Meyen -- not accepted
  Agrostis glauca (Nees) Steud. -- not accepted
  Agrostis glutinosa Fisch. ex Nees -- not accepted
  Agrostis hygrometrica Nees -- not accepted
  Agrostis hygrometrica var. hygrometrica Nees -- not accepted
  Agrostis montevidensis Spreng. ex Nees -- accepted
  Agrostis montevidensis f. montevidensis Spreng. ex Nees -- accepted
  Agrostis montevidensis var. montevidensis Spreng. ex Nees -- not accepted
  Agrostis orientalis Nees -- not accepted
  Agrostis phleoides (Nees & Meyen) Desv. -- not accepted
  Agrostis trichotoma Nees ex Trin. -- not accepted
  Agrostis wightii Nees ex Steud. -- not accepted
  Aiouea densiflora Nees -- not accepted
  Aira grandiflora Nees ex Steud. -- not accepted
  Aira pulchra (Nees & Meyen) Steud. -- not accepted
  Airopsis aurea (Steud.) Nees -- not accepted
  Aliciella tenuis (F.G. Sm. & Neese) J.M. Porter -- accepted -- Mussentuchit Creek gilia
  Allagoptera Nees -- accepted
  Allagostachyum Nees ex Steud. -- not accepted
  Allogoptera Nees -- not accepted
  Alopecurus australis Nees -- not accepted
  Amphibromus Nees -- accepted -- wallaby grass
  Amphidonax Nees ex Lindl. -- not accepted
  Amphilophis leucopogon (Nees) Nash -- not accepted
  Anachyris Nees -- not accepted
  Anachyris paspaloides Nees -- not accepted
  Anastrophus pectinatus (Nees ex Trin.) Schltdl. ex B.D. Jacks. -- not accepted
  Anastrophyllopsis involutifolia (Mont. ex Gottsche, Lindenb. & Nees) Vána & L. Söderstr. -- accepted
  Anastrophyllum helleranum (Nees ex Lindenb.) R.M. Schust. -- not accepted -- Heller's anastrophyllum
  Anastrophyllum hellerianum (Nees ex Lindenb.) R.M. Schust. -- not accepted -- Heller's anastrophyllum
  Anastrophyllum piligerum (Nees) Steph. -- accepted
  Anastrophyllum tubulosum (Nees) Grolle -- accepted
  Anatherostipa obtusa (Nees & Meyen) Peńailillo -- accepted
  Anatherum holcoides Nees -- not accepted
  Anatherum spathiflorum (Nees) Griseb. -- not accepted
  Andrewsianthus aberrans (Nees & Mont.) Grolle -- accepted
  Andrewsianthus puniceus (Nees) R.M. Schust. ex Grolle -- accepted
  Andrewsianthus recurvifolius (Nees) R.M. Schust. -- accepted
  Andrographis Wall. ex Nees -- accepted -- false waterwillow
  Andrographis echioides (L.) Nees -- accepted -- false waterwillow
  Andrographis paniculata (Burm. f.) Wall. ex Nees -- accepted
  Andropogon canescens (Nees) Kunth -- not accepted
  Andropogon carinatus Nees -- accepted
  Andropogon citratus DC. ex Nees -- not accepted
  Andropogon contortus subvar. secundus (Willd. ex Nees) Hack. -- not accepted
  Andropogon dissolutus (Nees) Steud. -- not accepted
  Andropogon drummondii Nees ex Steud. -- not accepted
  Andropogon flexuosus Nees ex Steudel -- not accepted
  Andropogon glaucescens var. lateralis (Nees) Hack. -- not accepted
  Andropogon hirtiflorus (Nees) Kunth -- not accepted
  Andropogon hirtiflorus var. hirtiflorus (Nees) Kunth -- not accepted
  Andropogon hirtiflorus var. semiberbis (Nees) Stapf -- not accepted
  Andropogon holcoides (Nees) Kunth -- not accepted
  Andropogon incanus var. lateralis (Nees) Hack. -- not accepted
  Andropogon lateralis Nees -- accepted
  Andropogon lateralis ssp. lateralis Nees -- accepted
  Andropogon lateralis var. lateralis Nees -- not accepted
  Andropogon latiflorus Nees ex Steud. -- not accepted
  Andropogon leucopogon Nees -- not accepted
  Andropogon ligularis (Nees) Kunth -- not accepted
  Andropogon micans (Nees) Steud. -- not accepted
  Andropogon minarum (Nees) Kunth -- not accepted
  Andropogon mollis (Nees) Kunth -- not accepted
  Andropogon nudus Nees ex Steud. -- not accepted
  Andropogon nutans var. scaberrimus (Nees) Hack. -- not accepted
  Andropogon obtusus Nees -- not accepted
  Andropogon perfossus Nees & Meyen ex Steud. -- not accepted
  Andropogon rostratus (Nees) Trin. -- not accepted
  Andropogon roxburghii Nees ex Steud. -- not accepted
  Andropogon rudis Nees ex Steud. -- not accepted
  Andropogon rufus (Nees) Kunth -- not accepted
  Andropogon saccharoides ssp. leucopogon (Nees) Hack. -- not accepted
  Andropogon scaberrimus (Nees) Kunth -- not accepted
  Andropogon scrobiculatus (Nees) Kunth -- not accepted
  Andropogon secundus Willd. ex Nees -- not accepted
  Andropogon semiberbis (Nees) Kunth -- not accepted
  Andropogon semiberbis var. humilis Nees ex Türpe -- not accepted
  Andropogon sorghum var. drummondii (Nees ex Steud.) Hack. -- not accepted
  Andropogon spathiflorus (Nees) Kunth -- not accepted
  Andropogon submuticus Nees ex Steud. -- not accepted
  Andropogon tener (Nees) Kunth -- not accepted
  Andropogon tener var. dubius (Nees) Hack. -- not accepted
  Andropogon tener var. filiformis (Nees) Hack. -- not accepted
  Andropogon ternatus (Spreng.) Nees -- accepted
  Andropogon thymiodorus (Nees) Steud. -- not accepted
  Andropogon villosus (Nees) Ekman -- not accepted
  Aneura ambrosioides (Nees) Pearson -- not accepted
  Aneura major (Nees) A. Evans -- not accepted
  Aneura multifida var. ambrosioides (Nees) Pearson -- not accepted
  Aneura multifida var. major (Nees) Debat -- not accepted
  Aneura multifida var. submersa (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- not accepted
  Aneura palmata var. major (Nees) Debat -- not accepted
  Aneura palmata var. polyblasta Nees -- not accepted
  Aneura pinnatifida var. composita (Nees) Debat -- not accepted
  Aniba bracteata (Nees) Mez -- accepted -- canelillo
  Aniba firmula (Nees & Mart.) Mez -- accepted
  Anisacanthus Nees -- accepted -- desert honeysuckle
  Anisacanthus quadrifidus (Vahl) Nees -- accepted -- Wright's desert honeysuckle
  Anisacanthus quadrifidus (Vahl) Nees -- not accepted
  Anthacanthus spinosus (Jacq.) Nees -- not accepted
  Anthaenantia lanata var. mollis (Nees) Arechav. -- not accepted
  Anthaenantiopsis perforata (Nees) Parodi -- accepted
  Anthaenantiopsis perforata var. perforata (Nees) Parodi -- accepted
  Anthaenantiopsis trachystachya (Nees) Mez ex Pilg. -- accepted
  Anthaenantiopsis trachystachya (Nees) Mez -- not accepted
  Anthaenatiopsis trachystachya (Nees) Mez -- not accepted
  Anthistiria dissoluta Nees ex Steud. -- not accepted
  Anthistiria humboldtii Nees -- not accepted
  Anthoceros crassinervis Nees -- not accepted
  Anthoceros flexivalvis Gottsche ex Nees -- not accepted
  Anthoceros javanicus Nees -- not accepted
  Anthoceros laevis var. tenuis (Nees) Gottsche, Lindenb. & Nees -- not accepted
  Anthoceros minarum Nees -- not accepted
  Anthoceros punctatus var. cavernosus (Nees) Gottsche, Lindenb. & Nees -- not accepted
  Anthochloa lepida Nees & Meyen -- not accepted
  Anthochloa lepidula Nees & Meyen -- not accepted
  Archilejeunea juliformis (Nees) Gradst. -- accepted
  Aristida elliptica (Nees) Kunth -- accepted
  Aristida gibbosa (Nees) Kunth -- accepted
  Aristida glauca (Nees) Steud. -- not accepted
  Aristida glauca (Nees) Walp. -- not accepted
  Aristida laevis (Nees) Kunth -- accepted
  Aristida pallens var. tenuifolia (Nees) Trin. & Rupr. -- not accepted
  Aristida purpurea var. glauca (Nees) A.H. Holmgren & N.H. Holmgren -- not accepted
  Aristida torta (Nees) Kunth -- accepted
  Arthraxon ciliare ssp. nudus (Nees ex Steud.) Hack. -- not accepted
  Arthraxon ciliare ssp. submuticus (Nees ex Steud.) Hack. -- not accepted
  Arthraxon ciliaris ssp. nudus (Nees ex Steud.) Hack. -- not accepted
  Arthraxon ciliaris ssp. submuticus (Nees ex Steud.) Hack. -- not accepted
  Arthraxon cryptatherus ssp. nudus (Nees ex Steud.) Koidz. -- not accepted
  Arthraxon cryptatherus ssp. submuticus (Nees ex Steud.) Koidz. -- not accepted
  Arthraxon cuspidatus var. micans (Nees) Hack. -- not accepted
  Arthraxon hispidus var. nudus (Nees ex Steud.) Ohwi -- not accepted
  Arthraxon micans (Nees) Hochst. -- not accepted
  Arthraxon nudus (Nees ex Steud.) Hochst. -- not accepted
  Arthraxon plumbeus (Nees ex Arn.) Hochst. -- not accepted
  Arthraxon rudis (Nees ex Steud.) Hochst. -- not accepted
  Arthraxon submuticus (Nees ex Steud.) Hochst. -- not accepted
  Arthropogon Nees -- accepted
  Arthropogon villosus Nees -- accepted
  Arthrostylidium amplissimum (Nees) McClure -- not accepted
  Arthrostylidium leptophyllum (Nees) Döll -- not accepted
  Arundarbor distorta (Nees) Kuntze -- not accepted
  Arundarbor tagoara (Nees) Kuntze -- not accepted
  Arundarbor trinii (Nees) Kuntze -- not accepted
  Arundinaria falcata Nees -- not accepted
  Arundinaria macrostachya Nees -- not accepted
  Arundinaria pinifolia Nees -- not accepted
  Arundinaria verticillata Nees -- not accepted
  Arundinella deppeana Nees ex Steud. -- accepted
  Arundinella mikanii (Trin. ex Spreng.) Nees -- not accepted
  Arundinella pallida Nees -- not accepted
  Aspiromitus cavernosus (Nees) Schljakov -- not accepted
  Aster chilensis Nees -- not accepted -- creeping aster
  Aster chilensis var. chilensis Nees -- not accepted -- creeping aster
  Aster commixtus auct. non (Nees) Kuntze -- not accepted
  Aster commixtus (Nees) Kuntze -- not accepted
  Aster firmus Nees -- not accepted
  Aster glaucus Torr. & A. Gray non Nees -- not accepted
  Aster glomeratus (Bernh. ex Nees) Burgess -- not accepted
  Aster laevis var. purpuratus (Nees) A.G. Jones -- not accepted -- smooth aster
  Aster lamarckianus Nees -- not accepted
  Aster parviflorus A. Gray non Nees -- not accepted
  Aster patens var. phlogifolius (Muhl. ex Willd.) Nees -- not accepted
  Aster pinifolius Alexander non Nees -- not accepted
  Aster ptarmicoides (Nees) Torr. & A. Gray -- not accepted
  Aster puniceus ssp. firmus (Nees) A.G. Jones -- not accepted
  Aster puniceus var. firmus (Nees) Torr. & A. Gray -- not accepted -- purplestem aster
  Aster purpuratus Nees -- not accepted
  Aster schreberi Nees -- not accepted -- Schreber's aster
  Aster subspicatus Nees -- not accepted -- Douglas aster
  Aster subspicatus var. subspicatus Nees -- not accepted -- leafybract aster
  Asterella blumeana (Nees) Kachroo -- accepted
  Asterella chilensis (Nees & Mont.) A. Evans -- accepted
  Asterella lindenbergiana (Corda ex Nees) Lindb. ex Arnell -- accepted -- Lindenberg's asterella
  Asterella marginata (Nees) S.W. Arnell -- accepted
  Astragalus equisolensis Neese & S.L. Welsh -- accepted -- Elizabeth's milkvetch, horseshoe milk-vetch
  Asyneuma coromandeliana (Nees) -- not accepted
  Asystasia coromandeliana Nees -- not accepted
  Aulonemia amplissima (Nees) McClure -- accepted
  Axonopus barbatus (Nees) Parodi -- not accepted
  Axonopus barbatus (Nees) Kuhlm. -- not accepted
  Axonopus canaliculatus (Nees) Kuhlm. -- not accepted
  Axonopus canescens (Nees ex Trin.) Pilg. -- accepted
  Axonopus canescens var. canescens (Nees ex Trin.) Pilg. -- not accepted
  Axonopus complanatus (Nees) Dedecca -- accepted
  Axonopus eminens (Nees) G.A. Black -- accepted
  Axonopus eminens var. eminens (Nees) G.A. Black -- not accepted
  Axonopus exasperatus (Nees ex Steud.) G.A. Black -- not accepted
  Axonopus excavatus (Nees ex Trin.) Henrard -- not accepted
  Axonopus extenuatus (Nees) Kuhlm. -- not accepted
  Axonopus fastigiatus (Nees ex Trin.) Kuhlm. -- accepted
  Axonopus immersus (Nees) Kuhlm. -- not accepted
  Axonopus pellitus (Nees ex Trin.) Hitchc. & Chase -- accepted
  Axonopus pressus (Nees ex Steud.) Parodi -- accepted
  Axonopus pulcher (Nees) Kuhlm. -- not accepted
  Axonopus ramosissimus (Nees) Pilg. -- not accepted
  Axonopus siccus (Nees) Kuhlm. -- accepted
  Axonopus siccus var. siccus (Nees) Kuhlm. -- not accepted
  Aydendron bracteatum Nees -- not accepted
  Balantiopsis cancellata (Nees) Steph. -- accepted
  Bambusa distorta Nees -- not accepted
  Bambusa tagoara Nees -- not accepted
  Bambusa trinii Nees -- not accepted
  Barbilophozia sudetica (Nees ex Huebener) L. Söderstr., De Roo & Hedd. -- accepted
  Barleria opaca (Vahl) Nees -- accepted -- kwahu
  Barleria repens Nees -- accepted
  Batratherum Nees -- not accepted
  Batratherum micans Nees -- not accepted
  Batratherum submuticum (Nees ex Steud.) W. Watson -- not accepted
  Bazzania distans (Nees) Trevis. -- accepted
  Bazzania erosa (Reinw., Blume & Nees) Trevis. -- accepted
  Bazzania erosa var. erosa (Reinw., Blume & Nees) Trevis. -- accepted
  Bazzania longa (Nees) Trevis. -- accepted
  Bazzania longa var. longa (Nees) Trevis. -- accepted
  Bazzania loricata (Reinw., Blume & Nees) Trevis. -- accepted
  Bazzania peruviana (Nees) Trevis. -- accepted
  Bazzania praerupta (Reinw., Blume & Nees) Trevis. -- accepted
  Bazzania praerupta var. obliquata (Nees) Schiffn. -- accepted
  Bazzania praerupta var. praerupta (Reinw., Blume & Nees) Trevis. -- accepted
  Bazzania scutigera (Nees & Mont.) Trevis. -- accepted
  Bazzania serpentina (Nees) Trevis. -- accepted
  Bazzania spiralis (Reinw., Blume & Nees) Meijer -- accepted
  Bazzania tridens (Reinw., Blume & Nees) Trevis. -- accepted
  Bazzania tridens var. tridens (Reinw., Blume & Nees) Trevis. -- accepted
  Bazzania uncigera (Reinw., Blume & Nees) Trevis. -- accepted
  Bazzania uncigera var. uncigera (Reinw., Blume & Nees) Trevis. -- accepted
  Beilschmiedia Nees -- accepted
  Beilschmiedia roxburgiana Nees -- accepted
  Beilschneidia roxburghiana Nees -- not accepted
  Benzoin aestivale Nees -- not accepted
  Benzoin melissifolium (Walter) Nees -- not accepted
  Besleria flavo-virens Nees & Mart. -- accepted
  Bethencourtia palmensis (Nees) Choisy -- accepted
  Biantheridion undulifolium (Nees) Konstant. & Vilnet -- accepted
  Blyttia lyellii (Hook.) Endl. ex Gottsche Lindenb. & Nees -- not accepted
  Blyttia lyellii var. flotoviana (Nees) Gottsche Lindenb. & Nees -- not accepted
  Blyttia lyellii var. hibernica (Hook.) Nees -- not accepted
  Blyttia moerckii Nees -- not accepted
  Boronia megastigma Nees ex Bartl. -- accepted -- sweet boronia
  Bothriochloa leucopogon (Nees) Pilg. -- not accepted
  Bouteloua multiseta (Nees) Griseb. -- not accepted
  Brachiaria megastachya (Nees ex Trin.) Zuloaga & Soderstr. -- not accepted
  Brachiolejeunea phyllorhiza (Nees) Kruijt & Gradst. -- accepted
  Brachyodon trichodes (Web.) Nees & Hornsch. in Nees et al. -- not accepted
  Briza barbata (Nees) Trin. -- not accepted
  Briza brasiliensis (Nees ex Steud.) Ekman -- not accepted
  Briza lamarckiana Nees -- not accepted
  Briza poa Nees ex Steud. -- not accepted
  Briza scabra Nees ex Steud. -- not accepted
  Briza scabra (Nees ex Steud.) Ekman -- not accepted
  Briza sellowii Nees ex Steud. -- not accepted
  Briza triloba Nees -- not accepted
  Briza triloba var. alpha Nees -- not accepted
  Briza triloba var. beta Nees -- not accepted
  Briza triloba var. triloba Nees -- not accepted
  Briza uniolae (Nees) Nees ex Steud. -- not accepted
  Briza uniolae var. uniolae (Nees) Nees ex Steud. -- not accepted
  Brizopyrum cyperoides (Thunb.) Nees -- not accepted
  Brizopyrum douglasii (Nees) Hook. & Arn. -- not accepted
  Brizopyrum ovatum Nees ex Steud. -- not accepted
  Brizopyrum thalassicum (Kunth) Nees -- not accepted
  Bromidium Nees & Meyen -- accepted
  Bromidium brevifolium Nees & Meyen -- not accepted
  Bromidium caespitosum Nees & Meyen -- not accepted
  Bromidium hygrometricum (Nees) Nees & Meyen -- accepted
  Bromidium hygrometricum var. caespitosum (Nees & Meyen) Kuntze -- not accepted
  Bromidium hygrometricum var. spectabilis (Nees & Meyen) Kuntze -- not accepted
  Bromidium rigescens (J. Presl) Nees & Meyen -- not accepted
  Bromidium rigescens var. brevifolium Nees -- not accepted
  Bromidium rigescens var. rigescens (J. Presl) Nees & Meyen -- not accepted
  Bromidium spectabile Nees & Meyen -- not accepted
  Bromidium spectabile var. nubigenum Nees -- not accepted
  Bromidium spectabile var. spectabile Nees & Meyen -- not accepted
  Bromopsis auletica (Trin. ex Nees) Herter -- not accepted
  Bromus auleticus Trin. ex Nees -- accepted
  Bromus bicuspis Nees ex Steud. -- not accepted
  Bromus brevis Nees ex Steud. -- not accepted
  Bromus erectus var. auleticus (Trin. ex Nees) Döll -- not accepted
  Bromus gilliesii Nees ex Steud. -- not accepted
  Bromus hookeri var. marginatus (Nees ex Steud.) E. Fourn. -- not accepted
  Bromus marginatus Nees ex Steud. -- accepted -- mountain brome
  Bromus marginatus var. marginatus Nees ex Steud. -- not accepted -- large mountain brome
  Bromus setifolius var. brevifolius Nees -- accepted
  Bromus sitchensis var. marginatus (Nees ex Steud.) B. Boivin -- not accepted
  Bromus spicatus Nees -- not accepted
  Bromus unioloides f. brevis (Nees ex Steud.) Kloos -- not accepted
  Bromus unioloides var. brevis (Nees ex Steud.) Hack. -- not accepted
  Bromus unioloides var. glaucescens Nees -- not accepted
  Bryopteris (Nees) Lindenb. -- accepted
  Bryopteris diffusa (Sw.) Nees -- accepted
  Bryopteris filicina (Sw.) Nees -- accepted
  Bryum elegans Nees in Brid. -- not accepted
  Calamagrostis beyrichiana Nees ex Döll -- not accepted
  Calamagrostis capillaris Nees ex Steud. -- not accepted
  Calamagrostis montevidensis Nees -- not accepted
  Calamagrostis montevidensis var. montevidensis Nees -- not accepted
  Calamagrostis phleoides (Nees & Meyen) Steud. -- not accepted
  Calamagrostis velutina (Nees & Meyen) Steud. -- accepted
  Calamagrostis velutina (Nees & Meyen) Hauman -- not accepted
  Calamagrostis velutina var. velutina (Nees & Meyen) Hauman -- not accepted
  Calamagrostis viridiflavescens var. montevidensis (Nees) Kämpf -- accepted
  Callistephus chinensis (L.) Nees -- accepted -- China aster
  Calophanes humistrata (Michx.) Shuttlw. ex Nees -- not accepted
  Calotheca barbata Nees -- not accepted
  Calotheca triloba (Nees) Kunth -- not accepted
  Calypogeia arguta Nees & Mont. -- accepted
  Calypogeia bidentula (F. Weber) Nees -- accepted
  Calypogeia miquelii Mont. ex Gottsche, Lindenb. & Nees -- accepted
  Calypogeia peruviana Nees & Mont. -- accepted
  Calypogeia subintegra (Gottsche, Lindenb. & Nees) Bischl. -- accepted
  Calypogeia subintegra var. subintegra (Gottsche, Lindenb. & Nees) Bischl. -- accepted
  Calypogeja peruviana Nees & Mont. -- not accepted -- Peruvian calypogeja
  Campulosus brachystachyus Nees -- not accepted
  Campulosus cirrosus Nees -- not accepted
  Capeochloa cincta (Nees) N. P. Barker & H. P. Linder -- accepted
  Capeochloa cincta ssp. cincta (Nees) N. P. Barker & H. P. Linder -- accepted
  Carex baccans Nees -- accepted
  Carex meyenii Nees -- accepted -- Meyen's sedge
  Carpolipum melanosporum (Sull.) Nees -- not accepted
  Carpolipum orbiculare (Schwein.) Nees -- not accepted
  Carpolipum valvatum (Sull.) Nees -- not accepted
  Cenchrus complanatus (Nees) Morrone -- accepted
  Cenchrus nervosus (Nees) Kuntze -- accepted
  Cenchrus pauperus (Nees ex Steud.) Morrone -- accepted
  Cenchrus sphacelatus (Nees) Morrone -- accepted
  Cenchrus unisetus (Nees) Morrone -- accepted
  Cephalozia tricuspidata (Nees) Trevis. -- accepted
  Cephaloziella hampeana (Nees) Schiffn. ex Loeske -- accepted
  Cephaloziella rubella (Nees) Warnst. -- accepted
  Cephaloziella rubella var. rubella (Nees) Warnst. -- not accepted
  Ceratochloa brevis Nees ex B.D. Jacks. -- not accepted
  Ceratochloa haenkeana var. patens Nees -- not accepted
  Ceratochloa haenkeana var. subspicata Nees -- not accepted
  Ceratochloa marginata (Nees ex Steud.) W.A. Weber -- not accepted
  Ceratochloa simplex Nees -- not accepted
  Ceratochloa simplex Nees ex Steud. -- not accepted
  Ceratolejeunea ceratantha (Nees & Mont.) Schiffn. -- accepted
  Ceratolejeunea guianensis (Nees & Mont.) Steph. -- accepted
  Chaetaria canariensis (Willd.) Nees -- not accepted
  Chaetaria capillaris Nees -- not accepted
  Chaetaria elliptica Nees -- not accepted
  Chaetaria gibbosa Nees -- not accepted
  Chaetaria glauca Nees -- not accepted
  Chaetaria laevis Nees -- not accepted
  Chaetaria nana Nees ex Steud. -- not accepted
  Chaetaria pallens var. tenuifolia Nees -- not accepted
  Chaetaria setifolia (Kunth) Nees -- not accepted
  Chaetaria spadicea (Kunth) Nees -- not accepted
  Chaetaria torta Nees -- not accepted
  Chaetium Nees -- accepted
  Chaetium festucoides Nees -- accepted
  Chaetobromus Nees in J. Lindley -- accepted
  Chaetobromus involucratus (Schrad.) Nees -- accepted
  Chaetobromus involucratus ssp. dregeanus (Nees) Verboom -- accepted
  Chaetobromus involucratus ssp. involucratus (Schrad.) Nees -- accepted
  Chaetobromus involucratus ssp. sericeus (Nees) Verboom -- accepted
  Chaetobromus strictus (Schrad.) Nees -- not accepted
  Chaetochloa crus-ardeae (Willd. ex Nees) Kuhlm. -- not accepted
  Chaetochloa flava (Nees) Kuhlm. -- not accepted
  Chaetochloa flava (Nees) Scribn. -- not accepted
  Chaetochloa imberbis var. penicillata (Willd. ex Nees) Scribn. & Merr. -- not accepted
  Chaetochloa impressa (Nees) Hitchc. & Chase -- not accepted
  Chaetochloa lachnea (Nees) Hitchc. -- not accepted
  Chaetochloa nigrirostris (Nees) Skeels -- not accepted
  Chaetochloa penicillata (Willd. ex Nees) Scribn. -- not accepted
  Chaetochloa penicillata (Willd. ex Nees) Kuhlm. -- not accepted
  Chaetochloa scabrifolia (Nees) Kuhlm. -- not accepted
  Chaetochloa semirugosa (Nees) Kuhlm. -- not accepted
  Chamaecalamus spectabilis Meyen ex Nees -- not accepted
  Chamaeraphis crus-ardeae (Willd. ex Nees) Kuntze -- not accepted
  Chamaeraphis glauca var. penicillata (Willd. ex Nees) Kuntze -- not accepted
  Chamaeraphis penicillata (Willd. ex Nees) J. Presl ex Stuck. -- not accepted
  Chascolytrum barbatum (Nees) Kunth -- not accepted
  Chascolytrum lamarckianum (Nees) Matthei -- accepted
  Chascolytrum nutans Lindl. & Nees -- not accepted
  Chascolytrum scabrum (Nees ex Steud.) Matthei -- accepted
  Chascolytrum trilobum (Nees) E. Desv. -- not accepted
  Chasmanthium ornithorhynchum Nees -- accepted -- birdbill woodoats
  Chasmanthium ornithorhynchum (Nees) H.O. Yates -- not accepted
  Chasmanthium ornithorhynchum Nees ex Steud. -- not accepted
  Cheilolejeunea acutangula (Nees) Grolle -- accepted
  Cheilolejeunea clausa (Nees & Mont.) R.M. Schust. -- accepted
  Cheilolejeunea meyeniana (Nees, Lindenb. & Gottsche) R.M. Schust. & Kachroo -- accepted
  Cheilolejeunea neesiana (Nees) Sushil K. Singh & Pócs -- accepted
  Cheilolejeunea rigidula (Nees ex Mont.) R.M. Schust. -- accepted
  Cheilolejeunea trapezia (Nees) Kachroo & R.M. Schust. -- accepted
  Cheilolejeunea trifaria (Reinw., Blume & Nees) Mizut. -- accepted
  Chiastocaulon braunianum (Nees) S.D.F. Patzak, M.A.M. Renner, Schäf.-Verw. & Heinrichs -- accepted
  Chiastocaulon dendroides (Nees) Carl -- accepted
  Chiastocaulon oppositum (Reinw., Blume & Nees) S.D.F. Patzak, M.A.M. Renner, Schäf.-Verw. & Heinrichs -- accepted
  Chimonobambusa falcata (Nees) Nakai -- not accepted
  Chloris arundinacea Nees ex Steud. -- not accepted
  Chloris barbata var. decora (Nees ex Steud.) Benth. -- not accepted
  Chloris decora Nees ex Steud. -- not accepted
  Chloris mollis (Nees) Swallen -- not accepted
  Chondrachyrum Nees -- not accepted
  Chondrachyrum scabrum Nees -- not accepted
  Chondrachyrum scabrum Nees ex Steud. -- not accepted
  Chondrolaena Nees -- not accepted
  Chondrolaena phalaroides Nees -- not accepted
  Chondrolaena phalaroides var. dentata Nees -- not accepted
  Chondrosum aschenbornianum Nees -- not accepted
  Chondrosum gracile var. polystachyum Nees -- not accepted
  Chonecolea doellingeri (Nees) Grolle -- accepted
  Chrysopogon minarum (Nees) Benth. -- not accepted
  Chrysopogon trivialis Arn. & Nees -- not accepted
  Chusquea anelythra Nees -- accepted
  Chusquea capitata Nees -- accepted
  Chusquea cumingii Nees -- accepted
  Chusquea heterophylla Nees -- accepted
  Chusquea heterophylla var. heterophylla Nees -- not accepted
  Chusquea leptophylla Nees -- accepted
  Chusquea pinifolia (Nees) Nees -- accepted
  Chusquea pinifolia var. heterophylla (Nees) Hack. -- not accepted
  Chusquea pinifolia var. pinifolia (Nees) Nees -- not accepted
  Chusquea tenella Nees -- accepted
  Chusquea tenella var. tenella Nees -- accepted
  Cinnamomum aromaticum Nees -- not accepted -- cassia
  Cinnamomum burmannii (Nees & T. Nees) Blume -- not accepted
  Cinnamomum burmannii (Nees & T. Nees) Blume -- accepted -- Malaysian cinnamon, Padang cassia
  Cinnamomum cassia Nees ex Blume -- not accepted
  Cinnamomum elongatum (Nees) Kosterm. -- accepted -- laurel avispillo
  Cinnamomum tamala (Buch.-Ham.) T. Nees & Eberm. -- accepted -- Indian bark
  Cirsium barnebyi S.L. Welsh & Neese -- accepted -- Barneby's thistle
  Cladium leptostachyum Nees & Meyen -- not accepted
  Cladopodiella fluitans (Nees) H. Buch -- not accepted
  Clasmatocolea doellingeri (Nees) Steph. -- not accepted
  Clasmatocolea fasciculata (Nees) Grolle -- accepted
  Clomena peruviana var. pulvinata Nees -- not accepted
  Colanthelia macrostachya (Nees) McClure -- accepted
  Coleataenia caricoides (Nees ex Trin.) Soreng -- accepted
  Coleataenia longifolia ssp. rigidula (Bosc ex Nees) Soreng -- accepted
  Coleataenia prionitis (Nees) Soreng -- accepted
  Cololejeunea minutissima var. myriocarpa (Nees & Mont.) R.M. Schust. -- not accepted
  Cololejeunea minutissisma ssp. myriocarpa (Nees & Mont.) R.L. Zhu, Y. Yu & Pócs -- not accepted
  Cololejeunea myriocarpa (Nees & Mont.) A. Evans -- not accepted
  Cololejeunea obliqua (Nees & Mont.) Schiffn. -- accepted
  Colpodium pusillum Nees -- not accepted
  Colura corynophora (Nees, Lindenb. & Gottsche) Trevis. -- accepted
  Colura tortifolia (Nees & Mont.) Trevis. -- accepted
  Cordaea flotoviana Nees -- not accepted
  Coridochloa Nees -- not accepted -- coridochloa
  Coridochloa cimicina (L.) Nees ex Chase -- not accepted -- summer grass
  Coridochloa cimicina (L.) Nees ex B.D. Jacks. -- not accepted
  Cortaderia argentea (Nees) Stapf -- not accepted
  Cortaderia speciosa (Nees & Meyen) Stapf -- accepted
  Critesion flexuosum (Nees ex Steud.) Á. Löve -- not accepted
  Cronisia fimbriata (Nees) Whittem. & Bischl. -- accepted
  Crossandra infundibuliformis (L.) Nees -- accepted
  Crossocalyx hellerianus (Nees ex Lindenb.) Meyl. -- accepted
  Cryptolophocolea ciliolata (Nees) L. Söderstr., Crand.-Stotl., Stotler & Vána -- accepted
  Cryptolophocolea costata (Nees) L. Söderstr. -- accepted
  Cryptolophocolea martiana (Nees) L. Söderstr., Crand.-Stotl. & Stotler -- accepted
  Cryptolophocolea martiana ssp. bidentula (Nees) L. Söderstr., Crand.-Stotl. & Stotler -- accepted
  Cryptolophocolea martiana ssp. martiana (Nees) L. Söderstr., Crand.-Stotl. & Stotler -- accepted
  Ctenium brachystachyum (Nees) Kunth -- accepted
  Ctenium cirrhosum (Nees) Kunth -- accepted
  Ctenium cirrhosum var. cirrhosum (Nees) Kunth -- accepted
  Curtopogon gracilis Nees ex Trin. & Rupr. -- not accepted
  Cuscuta cassytoides Nees ex Engelm. -- accepted -- African dodder
  Cuspidatula contracta (Reinw., Blume & Nees) Steph. -- accepted
  Cuspidatula flexicaulis (Nees) Vána & L. Söderstr. -- accepted
  Cyclolejeunea foliorum (Nees) Grolle -- accepted
  Cymatochloa pyramidalis (Nees) Schltdl. ex Döll -- not accepted
  Cymbopogon flexuosus (Nees ex Steud.) Will.Watson -- accepted -- east indian lemongrass
  Cymbopogon rufus (Nees) Rendle -- not accepted
  Cymopterus goodrichii S.L. Welsh & Neese -- accepted -- Goodrich's springparsley, Toiyabe springparsley
  Cynodon incompletus Nees -- accepted
  Cynodon incompletus var. incompletus Nees -- accepted
  Cynodon pascuus Nees -- not accepted
  Cyperus acicularis Schrad. ex Nees -- not accepted
  Cyperus albomarginatus (Mart. & Schrad. ex Nees) Steud. -- not accepted
  Cyperus auriculatus Nees & Meyen ex Kunth -- not accepted -- eared flatsedge
  Cyperus densicaespitosus var. major (Nees) Kük. -- not accepted
  Cyperus dissitiflorus Nees ex Torr. -- not accepted
  Cyperus ferax var. auriculatus (Nees & Meyen ex Kunth) Kük. -- not accepted
  Cyperus flavus (Vahl) Nees, non J. Presl & C. Presl -- not accepted
  Cyperus odoratus var. acicularis (Schrad. ex Nees) O'Neill -- not accepted
  Cyperus oxylepis Nees ex Steud. -- accepted -- sharpscale flatsedge
  Cyperus phleoides (Nees ex Kunth) Hillebr. -- accepted -- Molokai flatsedge
  Cyperus phleoides var. phleoides (Nees ex Kunth) Hillebr. -- accepted -- Molokai flatsedge
  Cyperus sabulosus (Mart. & Schrad. ex Nees) Steud. -- not accepted
  Cyperus vahlii (Schrad. ex Nees) Steud. -- not accepted
  Cyrtandra endlicheriana Nees ex Walp. -- not accepted
  Danthonia angustifolia Nees -- not accepted
  Danthonia cincta Nees -- not accepted
  Danthonia collinita Nees -- not accepted
  Danthonia crispa var. trunculata Nees -- not accepted
  Danthonia curva Nees -- not accepted
  Danthonia decora Nees -- not accepted
  Danthonia disticha Nees -- not accepted
  Danthonia elephantina (Thunb.) Nees -- not accepted
  Danthonia hirsuta Nees -- not accepted
  Danthonia holciformis Nees -- not accepted
  Danthonia mutica Nees -- not accepted
  Danthonia picta Nees & Meyen -- not accepted
  Danthonia porosa Nees -- not accepted
  Danthonia porosa var. subinermis Nees -- not accepted
  Danthonia purpurea var. setosa Nees ex Drčge -- not accepted
  Danthonia rufa Nees -- not accepted
  Danthonia scabra Nees -- not accepted
  Danthonia setosa Nees -- not accepted
  Danthonia tenella Nees -- not accepted
  Danthonia trichotoma Nees -- not accepted
  Dendragrostis anelytra Nees ex Munro -- not accepted
  Dendrocalamus Nees -- accepted -- giant bamboo
  Dendrocalamus strictus (Roxb.) Nees -- accepted -- male bamboo
  Dendroceros Nees -- accepted
  Dendroceros (Dendroceros) Nees -- accepted
  Dendroceros breutelii Nees -- accepted
  Dendroceros breutelii ssp. breutelii Nees -- accepted
  Dendroceros crassinervis (Nees) Gottsche -- accepted
  Dendroceros crispatus (Hook.) Nees -- accepted
  Dendroceros crispatus var. crispatus (Hook.) Nees -- accepted
  Dendroceros crispus (Sw.) Nees -- accepted
  Dendroceros javanicus (Nees) Nees -- accepted
  Deschampsia australis auct. non Nees ex Steud. -- not accepted
  Deschampsia australis var. australis Nees ex Steud. -- not accepted
  Deschampsia cespitosa var. pulchra (Nees & Meyen) Nicora -- accepted
  Deschampsia flexuosa (L.) Nees -- not accepted
  Deschampsia pulchra Nees & Meyen -- not accepted
  Deyeuxia beyrichiana (Nees ex Döll) Sodiro -- not accepted
  Deyeuxia hygrometrica (Nees) Speg. -- not accepted
  Deyeuxia triflora Nees -- not accepted
  Deyeuxia velutina Nees & Meyen -- not accepted
  Deyeuxia viridiflavescens var. montevidensis (Nees) Cabrera & Rúgolo -- not accepted
  Diandrochloa namaquensis (Nees ex Schrad.) De Winter -- not accepted
  Diandrostachya chrysothrix (Nees) Jacq.-Fél. -- not accepted
  Dianthera androsaemifolia (Nees) Griseb. -- not accepted
  Dibrachiella parviflora (Nees) X.Q. Shi, R.L. Zhu & Gradst. -- accepted
  Dicliptera assurgens var. vahliana (Nees) M. Gómez -- not accepted
  Dicliptera vahliana Nees -- not accepted
  Dicliptera viridiflora (Nees) R.W. Long -- not accepted
  Dicranolejeunea axillaris (Nees & Mont.) Schiffn. -- accepted
  Diectomis laxa Nees -- not accepted
  Digitaria adusta (Nees) Griseb. -- not accepted
  Digitaria argyrograpta (Nees) Stapf -- accepted
  Digitaria chinensis (Nees) A. Camus -- not accepted
  Digitaria cruciata (Nees ex Steudel) A. Camus -- accepted -- crabgrass
  Digitaria diagonalis (Nees) Stapf -- accepted
  Digitaria diversinervis (Nees) Stapf -- accepted
  Digitaria lanuginosa (Nees) Henrard -- accepted
  Digitaria monodactyla (Nees) Stapf -- accepted
  Digitaria monodactyla var. monodactyla (Nees) Stapf -- not accepted
  Digitaria phaeothrix var. adusta (Nees) Rúgolo -- accepted
  Digitaria sacchariflora (Nees) Henrard -- accepted
  Digitaria tenuis (Nees) Henrard -- accepted
  Diplachne scabra (Nees) Nicora -- not accepted
  Diplachne spicata (Nees) Döll -- not accepted
  Diplachne verticillata Nees & Meyen -- not accepted
  Diplasiolejeunea pauckertii (Nees) Steph. -- accepted
  Diplolaena blyttii (Moerch) Nees -- not accepted
  Diplolaena lyellii var. flotoviana (Nees) Nees -- not accepted
  Diplolaena lyellii var. hibernica (Hook.) Nees -- not accepted
  Dipteracanthus drummondianus Nees -- not accepted
  Dipteracanthus strepens (L.) Nees -- not accepted
  Dissanthelium peruvianum (Nees & Meyen) Pilg. -- accepted
  Distichlis scoparia (Nees ex Kunth) Arechav. -- accepted
  Distichlis scoparia f. scoparia (Nees ex Kunth) Arechav. -- not accepted
  Distichlis scoparia var. scoparia (Nees ex Kunth) Arechav. -- accepted
  Doellingeria Nees -- accepted -- doellingeria, whitetop
  Doellingeria ptarmicoides Nees -- not accepted
  Doellingeria scabra (Thunb.) Nees -- accepted
  Doellingeria umbellata (Mill.) Nees -- accepted -- parasol flat-top white aster, parasol whitetop
  Doellingeria umbellata var. umbellata (Mill.) Nees -- accepted -- parasol whitetop
  Doellochloa fastigiata (Nees) Kuntze -- not accepted
  Drepanolejeunea dactylophora (Nees, Lindenb. & Gottsche) J.B. Jack & Steph. -- accepted
  Drepanolejeunea dactylophora var. dactylophora (Nees, Lindenb. & Gottsche) J.B. Jack & Steph. -- accepted
  Drepanolejeunea orthophylla (Nees & Mont.) Bischl. -- accepted
  Drepanolejeunea palmifolia (Nees) Schiffn. -- accepted
  Drepanolejeunea polyrhiza (Nees) Grolle & R.L. Zhu -- accepted
  Drepanolejeunea trematodes (Nees) Bischl. -- accepted
  Drepanostachyum falcatum (Nees) Keng f. -- accepted
  Dumortiera Nees -- accepted
  Dumortiera hirsuta (Sw.) Nees -- accepted
  Dumortiera hirsuta ssp. hirsuta (Sw.) Nees -- accepted
  Dumortiera hirsuta var. hirsuta (Sw.) Nees -- not accepted
  Dumortiera nepalensis (Taylor) Nees -- not accepted
  Dyschoriste Nees -- accepted -- snakeherb
  Dyschoriste schiedeana (Nees) Kuntze -- accepted -- Schied's snakeherb
  Echinochloa composita J. Presl ex Nees -- not accepted
  Echinochloa crus-galli f. sabulicola (Nees) Farw. -- not accepted
  Echinochloa polystachya var. spectabilis (Nees ex Trin.) Mart. Crov. -- accepted
  Echinochloa sabulicola (Nees) Hitchc. -- not accepted
  Echinochloa spectabilis (Nees ex Trin.) Link -- not accepted -- showy cockspur
  Echinochloa spectalibis (Nees) Link -- not accepted
  Echinolaena minarum (Nees) Pilg. -- accepted
  Echinolaena navicularis (Nees) Kunth -- not accepted
  Echinolaena procurrens (Nees ex Trin.) Kunth -- not accepted
  Electra brevifolia Nees ex Steud. -- not accepted
  Electra ovalis Nees ex Steud. -- not accepted
  Eleocharis acuminata (Muhl.) Nees -- not accepted
  Eleocharis calva var. australis (Nees) H. St. John -- not accepted
  Eleocharis nigrescens (Nees) Steud. -- accepted -- black spikerush
  Eleocharis obtusetrigona (Lindl. & Nees) Steud. -- accepted
  Eleocharis palustris var. australis Nees -- not accepted
  Eleocharis parvula (Roem. & Schult.) Link ex Bluff, Nees & Schauer -- accepted -- dwarf spikerush, dwarf spikesedge, little-head spike-rush, little-head spikerush
  Eleusine coracana var. stricta (Roxb.) Nees -- not accepted
  Eleusine distachya Nees -- not accepted
  Elionurus argenteus Nees -- not accepted
  Elionurus argenteus var. argenteus Nees -- not accepted
  Elionurus argenteus var. thimiodorus (Nees) Stapf -- not accepted
  Elionurus candidus var. latiflorus (Nees ex Steud.) Roberty -- not accepted
  Elionurus dubius Nees -- not accepted
  Elionurus latiflorus (Nees ex Steud.) Hack. -- not accepted
  Elionurus latiflorus var. latiflorus (Nees ex Steud.) Hack. -- not accepted
  Elionurus pertusus (L.) Nees ex Steud. -- not accepted
  Elionurus rostratus Nees -- not accepted
  Elionurus thimiodorus Nees -- not accepted
  Elionurus tripsacoides subvar. rostratus (Nees) Roberty -- not accepted
  Elymus asper Nees ex Steud. -- not accepted
  Elymus semicostatum (Nees ex Steud.) Á. Löve -- not accepted
  Elymus semicostatus (Nees ex Steud.) Á. Löve -- not accepted -- drooping wildrye
  Elymus semicostatus (Nees ex Steud.) Melderis -- accepted
  Elyonurus argenteus Nees -- not accepted
  Elyonurus latiflorus (Nees ex Steud.) Hack. -- not accepted
  Elyonurus rostratus Nees -- not accepted
  Encalypta apophysata Nees & Hornsch. in Nees et al. -- not accepted
  Enteropogon Nees -- accepted -- umbrellagrass, unbrellagrass
  Enteropogon mollis (Nees) Clayton -- accepted
  Eragrostis acutiflora (Kunth) Nees -- accepted
  Eragrostis airoides Nees -- accepted -- darnel lovegrass
  Eragrostis articulata (Schrank) Nees -- accepted
  Eragrostis brasiliana Nees -- not accepted
  Eragrostis brasiliensis (Raddi) Nees -- not accepted
  Eragrostis brasiliensis var. delta Nees -- not accepted
  Eragrostis brownei (Kunth ex Chapman) Nees ex Steud. -- not accepted -- Browne's lovegrass
  Eragrostis capillaris (L.) Nees -- accepted -- lace grass, lacegrass
  Eragrostis chilensis (Moris) Nees -- not accepted
  Eragrostis curvala (Schrad.) Nees -- not accepted
  Eragrostis curvula (Schrad.) Nees -- accepted -- weeping lovegrass
  Eragrostis curvula var. conferta Nees -- not accepted -- weeping lovegrass
  Eragrostis curvula var. curvula (Schrad.) Nees -- accepted
  Eragrostis elegans Nees -- not accepted
  Eragrostis elegantula Nees -- not accepted
  Eragrostis elegantula (Kunth) Nees ex Steud. -- not accepted
  Eragrostis erythrogona Nees ex Steud. -- not accepted
  Eragrostis hirsuta (Michx.) Nees -- accepted -- bigtop lovegrass
  Eragrostis inconstans Nees -- not accepted
  Eragrostis inconstans var. rufescens (Schrad. ex Schult.) Nees -- not accepted
  Eragrostis lehmanniana Nees -- accepted -- Lehmann lovegrass, Lehmann's lovegrass
  Eragrostis leucosticta Nees ex Döll -- accepted
  Eragrostis lugens Nees -- accepted -- mourning lovegrass
  Eragrostis namaquensis Nees ex Schrad. -- not accepted
  Eragrostis nutans auct. non (Retz.) Nees ex Steud. -- not accepted
  Eragrostis pectinacea (Michx.) Nees -- accepted -- purple love grass, purple lovegrass, spreading lovegrass, tufted lovegrass
  Eragrostis pectinacea var. pectinacea (Michx.) Nees -- accepted -- purple love grass, Purple lovegrass, spreading lovegrass, tufted lovegrass
  Eragrostis pilosa var. lugens (Nees) Griseb. -- not accepted
  Eragrostis plana Nees -- accepted -- South African lovegrass
  Eragrostis polytricha Nees -- accepted
  Eragrostis reptans (Michx.) Nees -- accepted -- creeping lovegrass
  Eragrostis setifolia Nees -- accepted -- bristleleaf lovegrass
  Eragrostis solida Nees -- accepted
  Eragrostis uniolae Nees -- not accepted
  Eragrostis unioloides (Retz.) Nees ex Steud. -- accepted -- Chinese lovegrass
  Eragrostis vahlii (Roem. & Schult.) Nees -- not accepted
  Eragrostis X lehmanniana Nees -- not accepted
  Eremonotus hellerianus (Nees ex Lindenb.) R.M. Schust. -- not accepted
  Eriachne ampla Nees -- not accepted
  Eriachne aurea (Steud.) Nees -- not accepted
  Eriachne aurea var. virens Nees -- not accepted
  Eriachne ecklonii Nees -- not accepted
  Eriachne microphylla Nees -- not accepted
  Eriachne pallida Nees -- not accepted
  Eriachne tuberculata Nees -- not accepted
  Erianthus angustifolius Nees -- not accepted
  Erianthus angustifolius var. angustifolius Nees -- not accepted
  Erianthus asper Nees -- not accepted
  Erianthus asper var. asper Nees -- not accepted
  Erianthus divaricatus var. angustifolius (Nees) Hack. -- not accepted
  Erianthus saccharoides ssp. angustifolius (Nees) Hack. -- not accepted
  Erianthus saccharoides var. angustifolius (Nees) Kuntze -- not accepted
  Eriocaulon longifolium Nees ex Kunth -- not accepted -- pipewort
  Eriochrysis holcoides (Nees) Kuhlm. -- accepted
  Eriogonum multiceps Nees -- not accepted
  Erodium cygnorum Nees -- accepted -- Australian stork's bill
  Eulalia praemorsa (Nees ex Steud.) Stapf ex Ridl. -- not accepted
  Eulalia viminea var. imberbis (Nees ex Steud.) Kuntze -- not accepted
  Euosmolejeunea clausa (Nees & Mont.) A. Evans -- not accepted
  Euosmolejeunea duriuscula (Nees) Steph. -- not accepted
  Euosmolejeunea tenerrima (Nees) Steph. -- accepted
  Euphorbia campestris var. esuliformis (S. Schauer ex Nees & S. Schauer) Boiss. -- not accepted
  Euphorbia esuliformis S. Schauer ex Nees & S. Schauer -- accepted
  Eurybia commixta Nees -- not accepted
  Eurybia commixta auct. non Nees -- not accepted
  Eurybia commixta auct. non Nees -- not accepted
  Eurybia glomerata Bernh. ex Nees -- not accepted
  Eurybia schreberi (Nees) Nees -- accepted -- Schreber's aster
  Eustachys distichophylla (Lag.) Nees -- accepted -- weeping fingergrass
  Eutriana multiseta Nees -- not accepted
  Evolvulus glomeratus Nees & Mart. -- accepted -- Brazilian dwarf morning-glory
  Festuca australis Nees ex Steud. -- not accepted
  Festuca fimbriata Nees -- accepted
  Festuca haenkei var. humilior (Nees & Meyen) St.-Yves -- not accepted
  Festuca hephaestophila Nees ex Steud. -- accepted
  Festuca humilior Nees & Meyen -- accepted
  Festuca pilosa Nees -- not accepted
  Festuca quitensis Willd. ex Nees -- not accepted
  Festuca tolucensis var. hephaestophila (Nees ex Steud.) Nees ex Hook. -- not accepted
  Festuca ulochaeta Nees ex Steud. -- accepted
  Fimbraria Nees -- not accepted
  Fimbristylis dichotoma ssp. podocarpa (Nees) T. Koyama -- accepted
  Fimbristylis geminata (Nees) Kunth -- not accepted
  Fingerhuthia Nees ex Lehm. -- accepted -- Zulu fescue
  Fingerhuthia africana Nees ex Lehm. -- accepted -- Zulu fescue
  Forasaccus marginatus (Nees ex Steud.) Lunell -- not accepted
  Fossombronia crispa Nees -- accepted
  Fossombronia porphyrorhiza (Nees) Prosk. -- accepted
  Fossombronia pusilla (L.) Nees -- accepted
  Frullania affinis Nees & Mont. -- accepted
  Frullania alternans Nees -- accepted
  Frullania apiculata (Reinw., Blume & Nees) Nees -- accepted
  Frullania apiculata var. apiculata (Reinw., Blume & Nees) Nees -- accepted
  Frullania arietina Taylor ex Gottsche, Lindenb. & Nees -- not accepted
  Frullania aterrima (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania atrata (Sw.) Nees ex Mont. -- accepted
  Frullania caulisequa (Nees) Mont. -- accepted
  Frullania clavata (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania congesta (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania cordistipula (Reinw., Blume & Nees) Nees -- accepted
  Frullania cordistipula var. cordistipula (Reinw., Blume & Nees) Nees -- accepted
  Frullania cordistipula var. mutica (Gottsche, Lindenb. & Nees) Schiffn. -- accepted
  Frullania cuneiloba Nees -- accepted
  Frullania cyparioides (Schwägr.) Nees -- accepted
  Frullania davurica Hampe ex Gottsche, Lindenb. & Nees -- accepted
  Frullania dispar Nees -- accepted
  Frullania ecklonii (Spreng.) Gottsche, Lindenb. & Nees -- accepted
  Frullania ecklonii var. ecklonii (Spreng.) Gottsche, Lindenb. & Nees -- accepted
  Frullania ecklonii var. robustior (Gottsche, Lindenb. & Nees) Sim -- accepted
  Frullania ecklonii var. rufescens Gottsche, Lindenb. & Nees -- accepted
  Frullania ecklonii var. tenerior (Gottsche, Lindenb. & Nees) Sim -- accepted
  Frullania ericoides (Nees) Mont. -- accepted
  Frullania ericoides var. ericoides (Nees) Mont. -- accepted
  Frullania ericoides var. laxa (Gottsche, Lindenb. & Nees) Schiffn. -- accepted
  Frullania fragilifolia (Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania fugax (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania gaudichaudii (Nees & Mont.) Nees & Mont. -- accepted
  Frullania gaudichaudii var. ceylanica (Nees) S. Hatt. -- accepted
  Frullania gaudichaudii var. gaudichaudii (Nees & Mont.) Nees & Mont. -- accepted
  Frullania gibbosa Nees -- accepted
  Frullania glomerata (Lehm. & Lindenb.) Nees & Mont. -- accepted
  Frullania gracilis (Reinw., Blume & Nees) Nees -- accepted
  Frullania gracilis ssp. gracilis (Reinw., Blume & Nees) Nees -- accepted
  Frullania gracilis var. brevior (Gottsche, Lindenb. & Nees) Schiffn. -- accepted
  Frullania gracilis var. gracilis (Reinw., Blume & Nees) Nees -- accepted
  Frullania gymnotis Nees & Mont. -- not accepted
  Frullania hypoleuca Nees -- accepted
  Frullania integristipula (Nees) Nees -- accepted
  Frullania integristipula var. integristipula (Nees) Nees -- accepted
  Frullania intermedia (Reinw., Blume & Nees) Nees -- accepted
  Frullania intermedia ssp. intermedia (Reinw., Blume & Nees) Nees -- accepted
  Frullania intermedia var. intermedia (Reinw., Blume & Nees) Nees -- accepted
  Frullania klotzschii Nees -- accepted
  Frullania laetevirens Hampe ex Gottsche, Lindenb. & Nees -- accepted
  Frullania lindenbergii var. fusca Gottsche, Lindenb. & Nees -- accepted
  Frullania lobulata (Hook.) Hook. & Nees -- accepted
  Frullania magellanica (Spreng.) F. Weber & Nees -- accepted
  Frullania magellanica ssp. magellanica (Spreng.) F. Weber & Nees -- accepted
  Frullania moniliata (Reinw., Blume & Nees) Mont. -- accepted
  Frullania monocera (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania monocera var. monocera (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania nigricaulis (Reinw., Blume & Nees) Nees -- accepted
  Frullania nigricaulis var. nigricaulis (Reinw., Blume & Nees) Nees -- accepted
  Frullania nodulosa (Reinw., Blume & Nees) Nees -- accepted
  Frullania oahuensis Hampe ex Gottsche, Lindenb. & Nees -- accepted
  Frullania ornithocephala (Reinw., Blume & Nees) Nees -- accepted
  Frullania ornithocephala var. major (Nees) Schiffn. -- accepted
  Frullania ornithocephala var. ornithocephala (Reinw., Blume & Nees) Nees -- accepted
  Frullania pycnantha (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania quillotensis (Nees & Mont.) Nees & Mont. -- accepted
  Frullania ramuligera (Nees) Mont. -- accepted
  Frullania rostrata (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania schimperi Nees -- accepted
  Frullania schimperi var. schimperi Nees -- accepted
  Frullania serrata var. pertenuis (Nees) Schiffn. -- accepted
  Frullania squarrosa (Reinw., Blume & Nees) Dumort. -- not accepted
  Frullania squarrosula (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Frullania subtilissima (Nees ex Mont.) Lindenb. -- accepted
  Frullania teneriffae (F. Weber) Nees -- accepted
  Frullania tetraptera Nees & Mont. -- accepted
  Frullania vaginata (Sw.) Nees -- accepted
  Frullania vaginata var. nigricans (Gottsche, Lindenb. & Nees) Schiffn. -- accepted
  Frullania vaginata var. vaginata (Sw.) Nees -- accepted
  Fuscocephaloziopsis albescens var. islandica (Nees) Vána & L. Söderstr. -- accepted
  Galatella punctata (Waldst. & Kit.) Nees -- accepted
  Gastridium phleoides (Nees & Meyen) C.E. Hubb. -- accepted -- nit grass
  Gastridium ventricosum ssp. phleoides (Nees & Meyen) Tzvelev -- not accepted
  Geocalyx Nees -- accepted
  Geocalyx graveolens (Schrad.) Nees -- accepted
  Geochloa decora (Nees) N. P. Barker & H. P. Linder -- accepted
  Geochloa rufa (Nees) N. P. Barker & H. P. Linder -- accepted
  Gerardia dulcis (Cav.) Nees -- not accepted
  Gesneria barbata Nees & Mart. -- not accepted
  Gilia tenuis F.G. Sm. & Neese -- not accepted -- Mussentuchit Creek gilia, Mussentuchit gilia
  Gloxinia helleri (Nees) Mart. -- not accepted
  Gloxinia macrophylla Nees & Mart. -- not accepted
  Gongylanthus Nees -- accepted
  Gongylanthus ericetorum (Raddi) Nees -- accepted
  Gottschea Nees ex Mont. -- not accepted
  Graptophyllum Nees -- accepted
  Grimmia alpestris (Web. & Mohr) Schleich. ex Nees in Nees et al. -- not accepted
  Grimmia apocarpa var. gracilis Web. & Mohr ex Nees et al. -- not accepted
  Grimmia apocarpa var. tenerrima Nees & Hornsch. in Nees et al. -- not accepted
  Grimmia gracilis (Web. & Mohr ex Nees et al.) Schleich. ex Limpr. -- not accepted
  Guadua distorta (Nees) Rupr. -- not accepted
  Guadua tagoara (Nees) Kunth -- accepted
  Guadua tagoara ssp. tagoara (Nees) Kunth -- accepted
  Guadua trinii (Nees) Nees ex Rupr. -- accepted
  Guadua trinii var. trinii (Nees) Nees ex Rupr. -- not accepted
  Gymnomitrion adustum Nees -- accepted
  Gymnomitrion corallioides Nees -- accepted
  Gymnomitrion corralioides Nees -- not accepted
  Gymnomitrion revolutum (Nees) H. Philib. -- accepted
  Gymnomitrion revolutum ssp. revolutum (Nees) H. Philib. -- accepted
  Gymnomitrium revolutum (Nees) H. Philib. -- not accepted
  Gymnopogon fastigiatus Nees -- accepted
  Gymnopogon fastigiatus ssp. fastigiatus Nees -- accepted
  Gymnopogon foliosus (Willd.) Nees -- accepted -- leafy skeletongrass
  Gymnopogon laevis Nees -- not accepted
  Gymnopogon laevis var. laevis Nees -- not accepted
  Gymnopogon mollis Nees -- not accepted
  Gymnostomum Nees & Hornsch. in Nees et al. -- accepted -- gymnostomum moss
  Gymnostomum calcareum Nees & Hornsch. in Nees et al. -- accepted -- calcareous gymnostomum moss
  Gymnothrix complanata Nees -- not accepted
  Gymnothrix nervosa Nees -- not accepted
  Gymnotrix complanata Nees -- not accepted
  Gymnotrix nervosa Nees -- not accepted
  Gymnotrix paupera Nees ex Steud. -- not accepted
  Gynerium argenteum Nees -- not accepted
  Gynerium argenteum var. argenteum Nees -- not accepted
  Gynerium parviflorum Nees -- not accepted
  Gynerium quila (Molina) Nees & Meyen -- not accepted
  Gynerium quila var. pygmaeum Nees -- not accepted
  Gynerium speciosum Nees & Meyen -- not accepted
  Haplomitrium Nees -- accepted
  Haplomitrium (Calobryum) (Nees) R.M. Schust. -- accepted
  Haplomitrium (Haplomitrium) Nees -- accepted
  Haplomitrium blumei (Nees) R.M. Schust. -- accepted
  Haplomitrium cordae Nees -- not accepted
  Haplomitrium hookeri (Lyell ex Sm.) Nees -- accepted
  Haplomitrium hookeri var. hookeri (Lyell ex Sm.) Nees -- accepted
  Harpalejeunea cinchonae (Nees) Schiffn. -- accepted
  Harpalejeunea cinchonae var. cinchonae (Nees) Schiffn. -- accepted
  Harpalejeunea oxyphylla (Nees & Mont.) Steph. -- accepted
  Harpanthus Nees -- accepted
  Harpanthus flotovianus (Nees) Nees -- accepted
  Helopus annulatus (Flüggé) Nees -- not accepted
  Helopus punctatus (L.) Nees -- not accepted
  Helopus punctatus var. punctatus (L.) Nees -- not accepted
  Helopus villosus (Thunb.) Nees -- not accepted
  Helopus villosus (Thunb.) Nees ex Steud. -- not accepted
  Hemicarpha Nees -- not accepted
  Hemicarpha drummondii Nees -- not accepted
  Hemicarpha micrantha var. drummondii (Nees) Friedl. -- not accepted
  Hemigraphis Nees -- accepted
  Henrya Nees ex Benth. -- accepted
  Henrya insularis Nees ex Benth. -- accepted -- island renegade, island-renegade
  Herbertus dicranus (Gottsche, Lindenb. & Nees) Trevis. -- accepted
  Herbertus sendtneri (Nees) Lindb. -- accepted
  Heteropogon contortus subvar. secundus (Willd. ex Nees) Domin -- not accepted
  Heteropogon scrobiculatus (Nees) E. Fourn. -- not accepted
  Heteropogon villosus Nees -- not accepted
  Heteroscyphus argutus (Reinw., Blume & Nees) Schiffn. -- accepted
  Heteroscyphus argutus var. argutus (Reinw., Blume & Nees) Schiffn. -- accepted
  Heteroscyphus aselliformis (Reinw., Blume & Nees) Schiffn. -- accepted
  Heteroscyphus baduinus (Nees) Schiffn. -- accepted
  Heteroscyphus combinatus (Nees) Schiffn. -- accepted
  Heteroscyphus contortuplicatus (Nees & Mont.) Grolle -- accepted
  Holcus sorghum ssp. drummondii (Nees ex Steud.) Hitchc. -- not accepted
  Holcus sorghum var. drummondii (Nees ex Steud.) Hitchc. -- not accepted
  Holographis Nees -- accepted
  Homoeatherum Nees ex Lindl. -- not accepted
  Hordeum aegiceras Nees ex Royle -- not accepted
  Hordeum divergens Nees & Meyen ex Steud. -- not accepted
  Hordeum flexuosum Nees ex Steud. -- accepted
  Hordeum pusillum ssp. flexuosum (Nees ex Steud.) Covas -- not accepted
  Hufelandia pendula (Sw.) Nees -- not accepted
  Hygrophila costata Nees & T. Nees -- accepted -- yerba de hicotea
  Hygrophila lacustris (Schltdl. & Cham.) Nees -- accepted -- gulf swampweed
  Hygrophila portoricensis Nees -- not accepted
  Hygrophila salicifolia (Vahl) Nees -- not accepted
  Hygroryza Nees -- accepted
  Hygroryza aristata (Retz.) Nees ex Wright & Arn. -- accepted
  Hygroryza ciliata (Retz.) Nees ex Steud. -- not accepted
  Hymenachne amplexicaulis (Rudge) Nees -- accepted -- West Indian marsh grass
  Hymenachne campestris Nees -- not accepted
  Hymenachne fluviatilis Nees -- not accepted
  Hymenachne fluviatilis Nees ex Trin. -- not accepted
  Hymenachne grumosa (Nees) Zuloaga -- accepted
  Hymenachne myosurus (Rich.) Nees -- not accepted
  Hymenoxys lapidicola S.L. Welsh & Neese -- not accepted -- stone rubberweed
  Hyparrhenia dissoluta (Nees ex Steud.) C.E. Hubb. -- not accepted
  Hyparrhenia dregeana (Nees) Stapf ex Stent -- accepted -- silky thatching grass
  Hyparrhenia rufa (Nees) Stapf -- accepted -- jaragua, jaraguagrass
  Hyparrhenia rufa var. rufa (Nees) Stapf -- accepted
  Hyperthelia dissoluta (Nees ex Steud.) Clayton -- accepted
  Hypogynium Nees -- not accepted -- West Indian bluestem
  Hypogynium campestre Nees -- not accepted
  Hypogynium spathiflorum Nees -- not accepted
  Ichnanthus almadensis (Nees ex Trin.) Kunth -- not accepted
  Ichnanthus almadensis var. almadensis (Nees ex Trin.) Kunth -- not accepted
  Ichnanthus axillaris (Nees) Hitchc. & Chase -- not accepted
  Ichnanthus calvescens (Nees ex Trin.) Döll -- accepted
  Ichnanthus calvescens var. calvescens (Nees ex Trin.) Döll -- accepted
  Ichnanthus candicans (Nees) Döll -- not accepted
  Ichnanthus candicans var. candicans (Nees) Döll -- not accepted
  Ichnanthus inconstans (Trin. ex Nees) Döll -- accepted
  Ichnanthus inconstans var. inconstans (Trin. ex Nees) Döll -- not accepted
  Ichnanthus martianus (Nees) Döll -- not accepted
  Ichnanthus minarum (Nees) Döll -- not accepted
  Ichnanthus pallens var. major (Nees) Stieber -- accepted
  Ichnanthus pallens var. majus (Nees) Stieber -- not accepted -- caruzo
  Ichnanthus petiolatus (Nees) Döll -- not accepted
  Ichnanthus petiolatus var. petiolatus (Nees) Döll -- not accepted
  Ichnanthus polythyrsus (Nees ex Steud.) K.E. Rogers -- not accepted
  Ichnanthus procurrens (Nees ex Trin.) Stieber -- not accepted
  Ichnanthus procurrens (Nees ex Trin.) Swallen -- accepted
  Ichnanthus procurrens var. procurrens (Nees ex Trin.) Swallen -- accepted
  Isachne myosotis Nees -- accepted
  Isachne streptostachys Nees ex Steud. -- not accepted
  Isachne trachyspermum (Nees) Nees -- not accepted
  Isachne trachyspermum (Nees) Balansa -- not accepted
  Ischaemum auritum Nees ex Steud. -- not accepted
  Ischaemum ciliare var. villosum (Nees) Hack. -- not accepted
  Isolepis hystrix (Thunb.) Nees -- accepted -- bottlebrush bulrush
  Isopaches hellerianus (Nees ex Lindenb.) Buch -- not accepted
  Isotachis armata (Nees) Gottsche -- accepted
  Jacobinia candicans (Nees) Benth. & Hook. f. -- not accepted
  Jamesoniella undulifolia (Nees) Müll. Frib. -- not accepted
  Jarava neaei (Nees ex Steud.) Peńailillo -- accepted
  Jarava plumosula (Nees ex Steud.) F. Rojas -- accepted
  Jarava pungens (Nees & Meyen) Matthei -- accepted
  Jensenia difformis (Nees) Grolle -- accepted
  Juncus sphaerocarpus auct. non Nees ex Funck -- not accepted
  Juncus sphaerocarpus Nees -- accepted
  Jungermannia carnea Nees -- not accepted
  Jungermannia confertissima Nees -- not accepted
  Jungermannia dubioides (Nees) H.A. Mill. -- accepted
  Jungermannia obovata Nees -- not accepted
  Jungermannia pinnatifida (F. Weber) Nees -- not accepted
  Jungermannia sphaerocarpa var. nana (Nees ex Flot.) Frye & L. Clark -- not accepted
  Jungermannia tristis Nees -- not accepted
  Justicia androsaemifolia (Nees) Lindau -- accepted
  Justicia candicans (Nees) L.D. Benson -- accepted -- Arizona water-willow, jacobina
  Justicia pilosella (Nees) Hilsenb. -- accepted -- Gregg's tube tongue
  Justicia verticillaris (Nees) Urb. -- not accepted
  Karroochloa curva (Nees) Conert & Türpe -- not accepted
  Karroochloa tenella (Nees) Conert & Türpe -- not accepted
  Koeleria cumingii Nees ex Steud. -- not accepted
  Koeleria permollis Nees ex Steud. -- accepted
  Koeleria poaeoides Nees ex Steud. -- not accepted
  Lachnagrostis phleoides Nees & Meyen -- not accepted
  Lagenocarpus Nees -- accepted -- lagenocarpus
  Lagenocarpus guianensis Lindl. & Nees -- accepted -- burr sedge
  Lappago occidentalis Nees ex Hook. -- not accepted
  Leersia aspera Nees ex Trin. -- not accepted
  Leersia contracta Nees -- not accepted
  Lejeunea adpressa Nees -- accepted
  Lejeunea cancellata Nees & Mont. -- accepted
  Lejeunea conformis Nees & Mont. -- accepted
  Lejeunea debilis (Lehm. & Lindenb.) Nees & Mont. -- accepted
  Lejeunea deplanata Nees -- accepted
  Lejeunea deplanata var. deplanata Nees -- accepted
  Lejeunea exilis (Reinw., Blume & Nees) Grolle -- accepted
  Lejeunea exilis var. exilis (Reinw., Blume & Nees) Grolle -- accepted
  Lejeunea flava (Sw.) Nees -- accepted
  Lejeunea flava ssp. flava (Sw.) Nees -- accepted
  Lejeunea haitica Nees & Mont. -- accepted
  Lejeunea laetevirens Nees & Mont. -- accepted
  Lejeunea laetivirens Nees & Mont. -- not accepted
  Lejeunea laxa (Nees) Lindenb. -- accepted
  Lejeunea lumbricoides (Nees) Nees -- accepted
  Lejeunea musae (Spreng.) Gottsche, Lindenb. & Nees -- accepted
  Lejeunea neumanniana Nees -- accepted
  Lejeunea pertusa (Corda ex Nees & Mont.) Gottsche, Lindenb. & Nees -- accepted
  Lejeunea phyllobola Nees & Mont. -- accepted
  Lejeunea phyllobola var. phyllobola Nees & Mont. -- accepted
  Lejeunea primordialis (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lejeunea pulvinata (Lehm. & Lindenb.) Nees & Mont. -- accepted
  Lejeunea rigidula Nees ex Mont. -- not accepted
  Lejeunea rothii (Schwägr.) Gottsche, Lindenb. & Nees -- accepted
  Lejeunea sordida (Nees) Nees -- accepted
  Lejeunea tenera (Sw.) Gottsche, Lindenb. & Nees -- accepted
  Lejeunea ulicina (Taylor) Gottsche, Lindenb. & Nees -- not accepted
  Lejeunea ulicina var. ulicina (Taylor) Gottsche, Lindenb. & Nees -- not accepted
  Lejeunea umbilicata (Nees) Nees -- accepted
  Lepeocercis annulata (Forssk.) Nees -- not accepted
  Lepeocercis mollicoma (Kunth) Nees -- not accepted
  Lepidolejeunea delessertii (Nees & Mont.) Grolle -- accepted
  Lepidolejeunea eluta (Nees) R.M. Schust. -- accepted
  Lepidozia cladorhiza (Reinw., Blume & Nees) Nees -- accepted
  Lepidozia filamentosa Gottsche, Lindenb. & Nees -- accepted
  Lepidozia glaucophylla (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lepidozia haskarliana (Gottsche, Lindenb. & Nees) Steph. -- accepted
  Lepidozia holorhiza (Reinw., Blume & Nees) Nees -- accepted
  Lepidozia holorhiza var. holorhiza (Reinw., Blume & Nees) Nees -- accepted
  Lepidozia holorhiza var. laxa (Nees) Schiffn. -- accepted
  Lepidozia laevifolia (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lepidozia laevifolia var. laevifolia (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lepidozia minor (Gottsche, Lindenb. & Nees) Solari -- accepted
  Lepidozia quadridens (Nees) Nees -- accepted
  Lepidozia trichodes (Reinw., Blume & Nees) Nees -- accepted
  Leptatherum Nees -- not accepted
  Leptochloa chinensis (L.) Nees -- accepted -- Asian sprangletop, Chinese sprangletop
  Leptochloa digitaria (Kunth) Nees -- not accepted
  Leptochloa dubia (Kunth) Nees -- accepted -- green spangletop, green sprangletop
  Leptochloa dubia ssp. dubia (Kunth) Nees -- not accepted
  Leptochloa gracilis Nees -- not accepted
  Leptochloa hirta Nees ex Steud. -- not accepted
  Leptochloa procera Nees -- accepted
  Leptochloa scabra Nees -- accepted -- rough sprangletop
  Leptochloa spicata (Nees) Scribn. -- not accepted
  Leptochloa virgata var. gracilis (Nees) Link -- not accepted
  Leptocoryphium Nees -- not accepted -- lanilla
  Leptocoryphium lanatum (Kunth) Nees -- not accepted -- lanilla
  Leptocoryphium lanatum var. lanatum (Kunth) Nees -- not accepted
  Leptocoryphium lanatum var. molle (Nees) Döll -- not accepted
  Leptocoryphium molle Nees -- not accepted
  Leptolejeunea radicosa (Nees ex Mont.) Grolle -- accepted
  Leptolejeunea vitrea (Nees) Schiffn. -- accepted
  Leptopogon carinatus subvar. lateralis (Nees) Roberty -- not accepted
  Leptoscyphus amphibolius (Nees) Grolle -- accepted
  Leptoscyphus australis (Gottsche, Lindenb. & Nees) R.M. Schust. -- accepted
  Leptoscyphus hexagonus (Nees) Grolle -- accepted
  Leptoscyphus porphyrius (Nees) Grolle -- accepted
  Leptoscyphus porphyrius ssp. porphyrius (Nees) Grolle -- accepted
  Ligeria barbata (Nees & Mart.) Hanst. -- not accepted
  Ligeria macrophylla (Nees & Mart.) Hanst. -- not accepted
  Liochlaena Nees -- accepted
  Liochlaena lanceolata Nees -- accepted
  Lipocarpha drummondii (Nees) G.C. Tucker -- accepted -- Drummond's halfchaff sedge
  Lodicularia capensis (Trin.) Nees -- not accepted
  Lodicularia peruviana Nees ex Meyen -- not accepted
  Lolium brasilianum Nees -- not accepted
  Lolium perenne var. brasilianum (Nees) Kuntze -- not accepted
  Lophochlaena Nees -- not accepted -- semaphoregrass
  Lophochlaena californica Nees -- not accepted
  Lophochlaena californica var. californica Nees -- not accepted -- annual semaphoregrass
  Lophocolea aequifolia Nees & Mont. -- accepted
  Lophocolea bispinosa (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea canaliculata (Gottsche, Lindenb. & Nees) Steph. -- accepted
  Lophocolea canaliculata var. canaliculata (Gottsche, Lindenb. & Nees) Steph. -- accepted
  Lophocolea cuspidata (Nees) Limpr. -- not accepted
  Lophocolea cuspidata var. alata (Gottsche, Lindenb. & Nees) Müll. Frib. -- not accepted
  Lophocolea cuspidata var. cuspidata (Nees) Limpr. -- not accepted
  Lophocolea difformis Nees -- accepted
  Lophocolea fragrans (Moris & De Not.) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea humifusa (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea humistrata (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea lenta (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea leptantha (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea martiana Nees -- not accepted
  Lophocolea minor Nees -- accepted
  Lophocolea mollis (Nees) Nees -- accepted
  Lophocolea muricata (Lehm.) Nees -- accepted
  Lophocolea muricata var. muricata (Lehm.) Nees -- accepted
  Lophocolea novae-zeelandiae (Lehm. & Lindenb.) Nees -- accepted
  Lophocolea novae-zeelandiae var. novae-zeelandiae (Lehm. & Lindenb.) Nees -- accepted
  Lophocolea orbigniana Nees & Mont. -- accepted
  Lophocolea perpusilla (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea sabuletorum (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea subviridis (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lophocolea textilis (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Lopholejeunea applanata (Reinw., Blume & Nees) Schiffn. -- accepted
  Lopholejeunea subfusca (Nees) Schiffn. -- accepted
  Lopholejeunea subfusca var. subfusca (Nees) Schiffn. -- accepted
  Lophozia collaris (Nees) Dumort. -- not accepted
  Lophozia groenlandica (Nees) Macoun -- not accepted
  Lophozia hornschuchiana (Nees) Macoun -- not accepted
  Lophozia jamaicensis (Nees) Steph. -- accepted
  Lophozia longiflora (Nees) Schiffn. -- accepted
  Lophozia marchica (Nees) Steph. -- not accepted
  Lophozia muelleri (Nees ex Lindenb.) Dumort. -- not accepted
  Lophozia schultzii (Nees) Schiffn. -- not accepted
  Lophozia sudetica (Nees ex Huebener) Grolle -- not accepted
  Lophozia ventricosa var. longiflora (Nees) Macoun -- not accepted
  Lophozia wenzelii (Nees) Steph. -- accepted
  Lophozia wenzelii var. wenzelii (Nees) Steph. -- not accepted
  Loudetiopsis chrysothrix (Nees) Conert -- accepted
  Lucaea plumbea (Nees ex Arn.) Steud. -- not accepted
  Ludolfia pinifolia (Nees) A. Dietr. -- not accepted
  Ludolfia verticillata (Nees) A. Dietr. -- not accepted
  Ludolphia pinifolia (Nees) A. Dietr. -- not accepted
  Machaeranthera Nees -- accepted -- goldenweed, machaeranthera, tansyaster
  Machaeranthera tanacetifolia (Kunth) Nees -- accepted -- Takhoka-daisy, tanseyleaf aster, tanseyleaf goldenweed, tanseyleaf tansyaster
  Machaerina falcata (Nees) T. Koyama -- accepted -- twigrush
  Macroptilium bracteatum (Nees & Mart.) Maréchal & Baudet -- accepted
  Madotheca navicularis (Lehm. & Lindenb.) Nees -- not accepted
  Mannia rupestris (Nees) Frye & L. Clark -- not accepted
  Marchantia aquatica (Nees) Burgeff -- not accepted
  Marchantia emarginata Reinw., Blume & Nees -- accepted
  Marchantia emarginata ssp. emarginata Reinw., Blume & Nees -- accepted
  Marchantia geminata Reinw., Blume & Nees -- accepted
  Marchantia inflexa Nees & Mont. -- accepted
  Marchantia paleacea ssp. diptera (Nees & Mont.) Inoue -- accepted
  Marchantia plicata Nees & Mont. -- accepted
  Marchesinia languida (Nees & Mont.) Steph. -- accepted
  Mariscus meyenianus (Kunth) Nees -- not accepted
  Mariscus phleoides Nees -- not accepted
  Marsupella neesii (Nees ex Sande Lac.) Sande Lac. ex Schiffn. -- accepted
  Marsupella revoluta (Nees) Trevis. -- not accepted
  Mastigophora Nees -- accepted
  Mastigophora Nees -- not accepted
  Mastigophora diclados (Brid. ex F. Weber) Nees -- accepted
  Mastigophora diclados var. diclados (Brid. ex F. Weber) Nees -- accepted
  Mastigophora viridula (Nees) Trevis. -- accepted
  Mastigophora woodsii (Hook.) Nees -- accepted
  Melica alata Nees ex Steud. -- not accepted
  Melica alata var. alata Nees ex Steud. -- not accepted
  Melica colpodioides Nees -- not accepted
  Melica commersonii Nees ex Steud. -- accepted
  Melica flava Nees ex Steud. -- not accepted
  Melica flava var. flava Nees ex Steud. -- not accepted
  Melica macra Nees -- accepted
  Melica macra var. macra Nees -- not accepted
  Melica sarmentosa Nees -- accepted
  Melica sarmentosa ssp. sarmentosa Nees -- not accepted
  Melica sarmentosa var. sarmentosa Nees -- accepted
  Melica violacea var. commersonii (Nees ex Steud.) Papp -- not accepted
  Melinis minutiflora var. glutinosa (Nees) Kuntze -- not accepted
  Melinis rosea (Nees) Hack. -- not accepted
  Meoschium rugosum (Salisb.) Nees -- not accepted
  Merostachys ternata Nees -- accepted
  Merxmuellera cincta (Nees) Conert -- not accepted
  Merxmuellera decora (Nees) Conert -- not accepted
  Merxmuellera disticha (Nees) Conert -- not accepted
  Merxmuellera rufa (Nees) Conert -- not accepted
  Mesoptychia collaris (Nees) L. Söderstr. & Vána -- accepted
  Mesosetum eriochrysoides (Nees) Kuhlm. -- not accepted
  Mesosetum pappophorum (Nees) Kuhlm. -- accepted
  Metacalypogeia alternifolia (Nees) Grolle -- accepted
  Metalejeunea cucullata (Reinw., Blume & Nees) Grolle -- accepted
  Metzgeria dichotoma (Sw.) Nees -- accepted
  Metzgeria furcata var. extensa Nees -- not accepted
  Metzgeria furcata var. ulvula Nees -- not accepted
  Microlejeunea laetivirens (Nees & Mont.) Evans -- not accepted
  Micropterygium Gottsche, Lindenb. & Nees -- accepted
  Micropterygium pterygophyllum (Nees) Trevis. -- accepted
  Micropterygium pterygophyllum var. pterygophyllum (Nees) Trevis. -- accepted
  Microstegium Nees -- accepted -- browntop, microstegium
  Microstegium imberbe (Nees ex Steud.) Tzvelev -- not accepted
  Microstegium vimineum var. imberbe (Nees ex Steud.) Honda -- not accepted
  Microstegium vimineum var. willdenowianum (Nees ex Steud.) A. Camus -- not accepted
  Microstegium vimineum var. willdenowianum (Nees ex Steud.) Sur -- not accepted
  Microstegium willdenowianum Nees ex Steud. -- not accepted
  Mielichhoferia Nees & Hornsch. in Nees et al. -- accepted -- copper moss
  Mielichhoferia elongata (Hoppe & Hornsch. ex Hook.) Nees & Hornsch. in Nees et al. -- not accepted
  Mielichhoferia nitida Nees & Hornsch. in Nees et al. -- not accepted
  Milium molle (Nees) Kunth -- not accepted
  Miscanthus capensis (Nees) Andersson -- accepted -- silvergrass
  Moerckia flotoviana (Nees) Schiffn. -- accepted
  Monachyron roseum (Nees) Parl. -- not accepted
  Monachyron tonsum (Nees) Parl. -- not accepted
  Monechma pilosella Nees -- not accepted
  Monochaete fastigiata (Nees) Döll -- not accepted
  Moorea argentea (Nees) Lem. -- not accepted
  Moorea speciosa (Nees & Meyen) Stapf -- not accepted
  Muhlenbergia aspericaulis Nees ex Trin. -- not accepted
  Muhlenbergia asperifolia (Nees & Meyen ex Trin.) Parodi -- accepted -- alkali muhly, scratchgrass
  Muhlenbergia asperifolia (Nees & Meyen ex Trin.) Matthei -- not accepted
  Muhlenbergia glauca (Nees) Mez -- not accepted
  Muhlenbergia glauca (Nees) B.D. Jacks. -- accepted -- desert muhly
  Muhlenbergia peruviana var. pulvinata (Nees) Nees & E. Mey. ex Kuntze -- not accepted
  Muhlenbergia subtilis Nees -- not accepted
  Myriocoleopsis minutissima ssp. myriocarpa (Nees & Mont.) R.L. Zhu, Y. Yu & Pócs -- accepted
  Nardurus (Bluff, Nees & Schauer) Rchb. -- not accepted
  Nassella hyalina (Nees) Barkworth -- accepted
  Nassella sellowiana (Nees ex Trin. & Rupr.) Peńailillo -- accepted
  Nassella trichotoma (Nees) Hack. ex Arechav. -- accepted -- serrated tussock, serrated tussock grass
  Nazia occidentalis (Nees) Scribn. -- not accepted
  Nectandra turbacensis (Kunth) Nees -- accepted -- laurel amarillo
  Neesiochloa barbata (Nees) Pilg. -- accepted
  Neesioscyphus argillaceus (Nees) Grolle -- accepted
  Neesioscyphus carneus (Nees) Grolle -- accepted
  Neesioscyphus homophyllus (Nees) Grolle -- accepted
  Nepenthes gymnamphora Nees -- accepted
  Nepenthes maxima Reinw. ex Nees -- accepted
  Neurolejeunea catenulata (Nees) Schiffn. -- accepted
  Nicoraella obtusa (Nees & Meyen) Torres -- not accepted
  Nomaphila stricta (Vahl) Nees -- accepted -- stiff beargrass
  Nothoceros minarum (Nees) J.C. Villarreal -- accepted
  Notodanthonia picta (Nees & Meyen) Veldkamp -- not accepted
  Nowodworskya fugax (Nees ex Steud.) Nevski -- not accepted
  Ocellochloa rudis (Nees) Zuloaga & Morrone -- accepted
  Ochellochloa rudis (Nees) Zuloaga & Morrone -- not accepted
  Ocotea patens (Sw.) Nees -- not accepted -- capberry
  Odontonema Nees -- accepted -- toothedthread
  Odontonema cuspidatum (Nees) Kuntze -- accepted -- mottled toothedthread
  Odontonema strictum (Nees) Kuntze -- not accepted
  Odontoschisma denudatum var. denudatum (Nees ex. Mart.) Dumort. -- not accepted
  Odontoschisma fluitans (Nees) L. Söderstr. & Vána -- accepted
  Olyra glaberrima var. humilis (Nees) Mez -- not accepted
  Olyra humilis Nees -- accepted
  Olyra humilis var. humilis Nees -- not accepted
  Olyra lateralis (J. Presl ex Nees) Chase -- not accepted
  Olyra scabra Nees -- not accepted
  Olyra scorbiculata Schrad. ex Nees -- not accepted
  Olyra semiovata var. humilis (Nees) Hack. -- not accepted
  Olyra ventricosa Nees -- not accepted
  Omphalanthus Lindenb. & Nees -- not accepted
  Oplismenus discolor (Trin. ex Nees) Kunth -- not accepted
  Oplismenus festucoides (Nees) Kunth -- not accepted
  Oplismenus humboldtianus Nees -- not accepted
  Oplismenus minarum Nees -- not accepted
  Oplismenus oahuaensis Nees & Meyen ex Steud. -- not accepted
  Oplismenus penicillatus (Nees) Kunth -- not accepted
  Oplismenus sabulicola (Nees) Kunth -- not accepted
  Oplismenus spectabilis (Nees ex Trin.) Kunth -- not accepted
  Opuntia basilaris var. heilii S.L. Welsh & Neese -- accepted -- Heil's beavertail pricklypear
  Ortachne Nees ex Steud. -- accepted
  Ortachne pilosa (Kunth) Nees -- not accepted
  Ortachne retorta Nees ex Steud. -- not accepted
  Orthotrichum speciosum Nees in Sturm -- accepted -- lanceolateleaf rock moss
  Orthotrichum speciosum var. speciosum Nees in Sturm -- accepted -- lanceolateleaf rock moss
  Oryzopsis trichotoma (Nees) Druce -- not accepted
  Otachyrium Nees -- accepted
  Otachyrium junceum Nees -- not accepted
  Oxycaryum Nees -- accepted -- bulrush
  Pachystachys Nees -- accepted
  Pachystachys lutea Nees -- accepted -- lollipop-plant
  Pachystachys riedeliana Nees -- not accepted
  Pallavicinia flotoviana (Nees) Lindb. -- not accepted
  Panax japonicus (T. Nees) C.A. Mey. -- accepted -- Japanese ginseng
  Panax schinseng Nees -- not accepted
  Panicum acuminatissimum Nees ex Döll -- not accepted
  Panicum adustum Nees -- not accepted
  Panicum affine (Roem. & Schult.) Nees -- not accepted
  Panicum agrostis Nees ex Döll -- not accepted
  Panicum almadense Nees ex Trin. -- not accepted
  Panicum ammophilum Trin. ex Nees -- not accepted
  Panicum aquaticum var. chloroticum (Nees ex Trin.) R.C. Foster -- not accepted
  Panicum aureum (Hochst. ex A. Braun) Nees -- not accepted
  Panicum auricomum Nees ex Trin. -- accepted
  Panicum axillare Nees -- not accepted
  Panicum calvescens Nees ex Trin. -- not accepted
  Panicum campestre Nees ex Trin. -- accepted
  Panicum campestre Nees -- not accepted
  Panicum candicans Nees -- not accepted
  Panicum candidum Nees ex Trin. -- not accepted
  Panicum caricoides Nees ex Trin. -- not accepted
  Panicum cayennense var. campestris (Nees) Pilg. -- not accepted
  Panicum chloroticum Nees ex Trin. -- not accepted
  Panicum chloroticum var. agreste Nees ex Trin. -- not accepted
  Panicum chloroticum var. pingue Nees -- not accepted
  Panicum chloroticum var. sylvestre Nees -- not accepted
  Panicum chloroticum var. sylvestre Nees ex Trin. -- not accepted
  Panicum colonum var. humile Nees -- not accepted
  Panicum commutatum var. didactylum (Willd.) Nees -- not accepted
  Panicum compositum (Kunth) Nees -- not accepted
  Panicum crus-ardeae Willd. ex Nees -- not accepted
  Panicum crus-galli var. sabulicola (Nees) Trin. -- not accepted
  Panicum crus-galli var. sabulicola (Nees) Döll -- not accepted
  Panicum cruspavonis (Kunth) Nees -- not accepted
  Panicum cyanescens Nees -- not accepted
  Panicum cyanescens Nees ex Trin. -- accepted
  Panicum dasyurum Willd. ex Nees -- not accepted
  Panicum decipiens Nees ex Trin. -- not accepted
  Panicum decipiens Nees -- not accepted
  Panicum diffusum var. debile Nees -- not accepted
  Panicum discolor Trin. ex Nees -- not accepted
  Panicum distichophyllum (Spreng.) Nees -- not accepted
  Panicum drummondii Nees ex Steud. -- not accepted
  Panicum echinolaena Nees -- not accepted
  Panicum echinolaena var. ciliatum Nees -- not accepted
  Panicum echinolaena var. glabrum Nees ex Döll -- not accepted
  Panicum echinolaena var. villosum Nees -- not accepted
  Panicum elephantipes Nees -- not accepted
  Panicum elephantipes Nees ex Trin. -- accepted -- elephant panicgrass
  Panicum elliotii Trin. ex Nees -- not accepted
  Panicum eriochrysoides Nees -- not accepted
  Panicum eriophorum Link ex Nees -- not accepted
  Panicum exasperatum Nees ex Steud. -- not accepted
  Panicum excelsum Nees -- not accepted
  Panicum extensum Nees & Arn. ex Wight -- not accepted
  Panicum ferrugineum (Nees) Kunth -- not accepted
  Panicum firmifolium Trin. ex Nees -- not accepted
  Panicum flavum Nees -- not accepted
  Panicum fuscatum J. Presl ex Nees -- not accepted
  Panicum fuscescens Willd. ex Nees -- not accepted
  Panicum glandulosum Nees -- not accepted
  Panicum glandulosum Nees ex Trin. -- not accepted
  Panicum glaucescens Nees -- not accepted
  Panicum glaucum var. brasiliense Trin. ex Nees -- not accepted
  Panicum grandiflorum Trin. ex Nees -- not accepted
  Panicum grumosum Nees -- not accepted
  Panicum heterophyllum Bosc ex Nees -- not accepted
  Panicum hydrophilum Trin. ex Nees -- not accepted
  Panicum ichnanthum Nees -- not accepted
  Panicum imberbe var. dasyurum (Willd. ex Nees) Döll -- not accepted
  Panicum imberbe var. pumilum (Poir.) Nees -- not accepted
  Panicum immersum (Nees) Trin. -- not accepted
  Panicum impressum Nees -- not accepted
  Panicum inconstans Trin. ex Nees -- not accepted
  Panicum inconstans var. inconstans Trin. ex Nees -- not accepted
  Panicum insulare var. sacchariflorum (Nees) Hack. -- not accepted
  Panicum junceum Nees -- not accepted
  Panicum lachneum Nees -- not accepted
  Panicum laterale J. Presl ex Nees -- not accepted
  Panicum leiophyllum Nees -- not accepted
  Panicum ligulare Nees -- not accepted
  Panicum ligulare Nees ex Trin. -- accepted
  Panicum lolium Nees -- not accepted
  Panicum lutescens var. flavum (Nees) Backer -- not accepted
  Panicum macrostachyum (Kunth) Nees -- not accepted
  Panicum martianum Nees -- not accepted
  Panicum megastachyum Nees -- not accepted
  Panicum megastachyum Nees ex Trin. -- not accepted
  Panicum milioides Nees ex Trin. -- not accepted
  Panicum milioides Nees -- not accepted
  Panicum minarum (Nees) Steud. -- not accepted
  Panicum monodactylum Nees -- not accepted
  Panicum naviculare Nees -- not accepted
  Panicum nigrirostre Nees -- not accepted
  Panicum onurus Willd. ex Nees -- not accepted
  Panicum pallens var. grandiflora Trin. ex Nees -- not accepted
  Panicum pallens var. majus Nees -- not accepted
  Panicum pallens var. swartzii Nees -- not accepted
  Panicum paludicola Nees -- not accepted
  Panicum pappophorum Nees -- not accepted
  Panicum penicillatum Nees -- not accepted
  Panicum penicillatum Nees ex Trin. -- accepted
  Panicum penicillatum Willd. ex Nees -- not accepted
  Panicum perfoliatum Nees -- not accepted
  Panicum perforatum Nees -- not accepted
  Panicum petiolatum Nees -- not accepted
  Panicum phaeocarpum var. drummondianum Nees -- not accepted
  Panicum philadelphicum Bernh. ex Nees -- not accepted
  Panicum philadephicum Bernh. ex Nees -- not accepted
  Panicum phragmites Nees -- not accepted
  Panicum polythyrsum Nees ex Steud. -- not accepted
  Panicum porphyrium Trin. ex Nees -- not accepted
  Panicum prionitis Nees -- not accepted
  Panicum procurrens Nees ex Trin. -- not accepted
  Panicum procurrens subvar. procurrens Nees ex Trin. -- not accepted
  Panicum procurrens var. procurrens Nees ex Trin. -- not accepted
  Panicum proliferum var. chloroticum (Nees ex Trin.) Hack. -- not accepted
  Panicum pruriens var. glabrum Nees -- not accepted
  Panicum pseudopaspalus Nees -- not accepted
  Panicum pumilum Bosc ex Nees -- not accepted
  Panicum recalvum (Nees) Kunth -- not accepted
  Panicum repandum Nees -- not accepted
  Panicum rigidulum Bosc ex Nees -- not accepted -- redtop panicgrass, redtop panicum
  Panicum rigidulum ssp. rigidulum Bosc ex Nees -- not accepted
  Panicum rigidulum var. rigidulum Bosc ex Nees -- not accepted -- redtop panicgrass, redtop panicum
  Panicum rivulare var. grumosum (Nees) Hack. -- not accepted
  Panicum roseum (Nees) Steud. -- not accepted
  Panicum rottleri (Spreng.) Nees -- not accepted
  Panicum rude Nees -- not accepted
  Panicum rupestre var. setifolium Nees -- not accepted
  Panicum sabulicola Nees -- not accepted
  Panicum sacchariflorum (Nees) Steud. -- not accepted
  Panicum scabrifolium Nees -- not accepted
  Panicum scindens Nees ex Steud. -- not accepted
  Panicum sellowii Nees -- accepted
  Panicum semirugosum Nees -- not accepted
  Panicum setifolium Nees -- not accepted
  Panicum setosum var. leiophyllum (Nees) Döll -- not accepted
  Panicum speciosum Nees ex Trin. -- not accepted
  Panicum spectabile Nees ex Trin. -- not accepted
  Panicum spectabile Nees -- not accepted
  Panicum spithamaeum Willd. ex Nees -- not accepted
  Panicum subulicola Nees -- not accepted
  Panicum tejucense Nees -- not accepted
  Panicum tenacissimum (Schrad. ex Schult.) Nees -- not accepted
  Panicum tonsum (Nees) Steud. -- not accepted
  Panicum trachyspermum Nees -- not accepted
  Panicum trachystachyum Nees -- not accepted
  Panicum trachystachyum var. trachystachyum Nees -- not accepted
  Panicum trichanthum Nees -- accepted -- thicket panicgrass
  Panicum truncatum Nees -- not accepted
  Panicum vaginatum Nees -- not accepted
  Panicum velutinosum Nees -- not accepted
  Panicum velutinosum Nees ex Trin. -- not accepted
  Panicum vilvoides var. campestre (Nees) Döll -- not accepted
  Panicum vilvoides var. fluviatile (Nees) Döll -- not accepted
  Panicum viridiflorum Nees -- not accepted
  Pappophorum eutrianoides Trin. ex Nees -- not accepted
  Pappophorum mucronulatum Nees -- accepted
  Pappophorum pappiferum var. mucronulatum (Nees) Kuntze -- not accepted
  Paracromastigum pachyrhizum (Nees) Fulford -- accepted
  Pariana glauca Nees -- not accepted
  Pariana glauca var. glauca Nees -- not accepted
  Pariana glauca var. scabra (Nees) Döll -- not accepted
  Pariana imberbis Nees -- accepted
  Pariana lunata Nees -- accepted
  Pariana lunata Nees ex Trin. -- not accepted
  Pariana mollis Nees -- not accepted
  Pariana scabra Nees -- not accepted
  Pariana silvestris Nees -- not accepted
  Pariana sylvestris Nees -- not accepted
  Parodiolyra lateralis (J. Presl ex Nees) Soderstr. & Zuloaga -- accepted
  Paspalum ancylocarpum Nees ex Steud. -- not accepted
  Paspalum angustifolium Nees ex Trin. -- not accepted
  Paspalum angustifolium Nees -- not accepted
  Paspalum barbatum Nees -- not accepted
  Paspalum barbatum Nees ex Trin. -- not accepted
  Paspalum barbatum var. pellitum (Nees ex Trin.) Döll -- not accepted
  Paspalum brachiatum Trin. ex Nees -- not accepted
  Paspalum canaliculatum Nees -- not accepted
  Paspalum canescens Nees -- not accepted
  Paspalum canescens Nees ex Trin. -- not accepted
  Paspalum chrysocomum Trin. ex Nees -- not accepted
  Paspalum commutatum Nees -- not accepted
  Paspalum complanatum Nees -- not accepted
  Paspalum compressum (Sw.) Nees -- not accepted
  Paspalum cumingii Nees ex Steud. -- not accepted
  Paspalum dolichostachyus Trin. ex Nees -- not accepted
  Paspalum effusum Nees -- not accepted
  Paspalum eminens Nees -- not accepted
  Paspalum encylocarpum Nees -- not accepted
  Paspalum erianthum Nees -- not accepted
  Paspalum erianthum Nees ex Trin. -- accepted
  Paspalum eriophorum Willd. ex Nees -- not accepted
  Paspalum eucomum Nees ex Trin. -- accepted
  Paspalum eucomum Nees -- not accepted
  Paspalum eucomum var. eucomum Nees ex Trin. -- not accepted
  Paspalum exasperatum Nees -- not accepted
  Paspalum excavatum Nees ex Trin. -- not accepted
  Paspalum extenuatum Nees -- not accepted
  Paspalum falcatum Nees ex Steud. -- accepted
  Paspalum fastigiatum Nees -- not accepted
  Paspalum fastigiatum Nees ex Trin. -- not accepted
  Paspalum filifolium Nees ex Steud. -- accepted
  Paspalum flaccidum Nees -- accepted
  Paspalum gardnerianum Nees -- accepted
  Paspalum gardnerianum var. gardnerianum Nees -- not accepted
  Paspalum haenkeanum Nees -- not accepted
  Paspalum haenkeanum var. minimum Nees -- not accepted
  Paspalum hyalinum Nees -- not accepted
  Paspalum hyalinum Nees ex Trin. -- accepted
  Paspalum immersum Nees -- not accepted
  Paspalum lachneum Nees ex Steud. -- accepted
  Paspalum lanuginosum Nees -- not accepted
  Paspalum ligulare Nees -- accepted
  Paspalum nervosum (Nees) Trin. ex LR Albee ined -- not accepted
  Paspalum notatum var. maculatum Nees -- not accepted
  Paspalum obscurum Nees ex Steud. -- not accepted
  Paspalum obtusatus Nees ex Döll -- not accepted
  Paspalum ovale Nees ex Steud. -- accepted
  Paspalum ovatum Nees ex Trin. -- not accepted
  Paspalum ovatum Nees -- not accepted
  Paspalum ovatum var. grandiflorum Nees -- not accepted
  Paspalum ovatum var. ovatum Nees ex Trin. -- not accepted
  Paspalum ovatum var. parviflorum Nees -- not accepted
  Paspalum parviflorum var. humile Nees ex Döll -- not accepted
  Paspalum pectinatum Nees ex Trin. -- accepted
  Paspalum pectinatum Nees -- not accepted
  Paspalum pellitum Nees -- not accepted
  Paspalum pellitum Nees ex Trin. -- not accepted
  Paspalum plantagineum Nees -- not accepted
  Paspalum polyphyllum Nees -- not accepted
  Paspalum polyphyllum Nees ex Trin. -- accepted
  Paspalum pressum Nees ex Steud. -- not accepted
  Paspalum pulchrum Nees -- not accepted
  Paspalum pumilum Nees -- accepted
  Paspalum pyramidale Nees -- not accepted
  Paspalum ramosissimum Nees -- not accepted
  Paspalum rectum Nees -- accepted
  Paspalum reduncum Nees ex Steud. -- accepted
  Paspalum riparium Nees -- accepted
  Paspalum rufum Nees ex Steud. -- accepted
  Paspalum saccharoides Nees ex Trin. -- accepted
  Paspalum scutatum Nees ex Trin. -- accepted
  Paspalum scutatum Nees -- not accepted
  Paspalum selloi Spreng. ex Nees -- not accepted
  Paspalum serpens Nees -- not accepted
  Paspalum siccum Nees -- not accepted
  Paspalum stellatum var. distachyum Nees -- not accepted
  Paspalum stellatum var. monostachyum Nees -- not accepted
  Paspalum stellatus var. monostachyus Nees -- not accepted
  Paspalum tenuis Nees ex Trin. -- not accepted
  Paspalum velutinum Trin. ex Nees -- not accepted
  Paspalus lanuginosus Nees -- not accepted
  Paspalus stellatus var. distachyus Nees -- not accepted
  Pedinophyllum interruptum (Nees) Kaal. -- accepted
  Pellia calycina (Taylor) Nees -- not accepted
  Pellia fuciformis (Bory) Nees -- not accepted
  Pennisetum breve Nees -- not accepted
  Pennisetum complanatum (Nees) Hemsl. -- not accepted -- Nicaraguan fountaingrass
  Pennisetum hirsutum Nees -- not accepted
  Pennisetum incomptum Nees ex Steud. -- not accepted -- kikuyugrass
  Pennisetum nervosum (Nees) Trin. -- not accepted -- bentspike fountaingrass, bentspike pennisetum
  Pennisetum orientale var. triflorum (Nees ex Steud.) Stapf -- not accepted
  Pennisetum pallidum Nees -- not accepted
  Pennisetum pauperum Nees ex Steud. -- not accepted
  Pennisetum setosum var. breve (Nees) Döll -- not accepted
  Pennisetum triflorum Nees ex Steud. -- not accepted
  Penstemon acaulis var. yampaensis (Penland) Neese -- not accepted
  Penstemon angustifolius var. dulcis Neese -- accepted -- broadbeard beardtongue
  Penstemon cyananthus var. compactus (D.D. Keck) Neese -- not accepted
  Penstemon cyananthus var. longiflorus (Pennell) Neese -- not accepted
  Penstemon duchesnensis (N.H. Holmgren) Neese -- accepted -- Duchesne penstemon
  Penstemon flowersii Neese & S.L. Welsh -- accepted -- Flowers' beardtongue
  Penstemon leonardii var. higginsii Neese -- accepted -- Higgins' beardtongue
  Penstemon leonardii var. patricus (N.H. Holmgren) Neese -- accepted -- Leonard's beardtongue, Leonard's penstemon
  Penstemon pachyphyllus var. mucronatus (N.H. Holmgren) Neese -- not accepted -- mucronate penstemon
  Penstemon scariosus var. cyanomontanus Neese -- accepted -- Neese's Blue Mountain beardtongue
  Penstemon thompsoniae var. desperatus Neese -- not accepted
  Pentameris airoides Nees -- accepted
  Pentameris airoides ssp. airoides Nees -- accepted
  Pentameris ampla (Nees) Galley & H. P. Linder -- accepted
  Pentameris angustifolia (Nees) Steud. -- not accepted
  Pentameris barbata (Nees) Steud. -- accepted
  Pentameris barbata ssp. barbata (Nees) Steud. -- accepted
  Pentameris capensis (Nees) Galley & H. P. Linder -- accepted
  Pentameris cirrhulosa (Nees) Steud. -- accepted
  Pentameris curvifolia (Schrad.) Nees -- accepted
  Pentameris densifolia (Nees) Steud. -- accepted
  Pentameris distichophylla (Lehm.) Nees -- accepted
  Pentameris ecklonii (Nees) Galley & H. P. Linder -- accepted
  Pentameris elegans (Nees) Steud. -- accepted
  Pentameris eriostoma (Nees) Steud. -- accepted
  Pentameris heptameris (Nees) Steud. -- accepted
  Pentameris holciformis (Nees) Galley & H. P. Linder -- accepted
  Pentameris lima (Nees) Steud. -- accepted
  Pentameris longiglumis (Nees) Steud. -- accepted
  Pentameris longiglumis ssp. longiglumis (Nees) Steud. -- accepted
  Pentameris microphylla (Nees) Galley & H. P. Linder -- accepted
  Pentameris mutica (Nees) Steud. -- not accepted
  Pentameris pallescens (Schrad.) Nees -- accepted
  Pentameris patula (Nees) Steud. -- accepted
  Pentameris porosa (Nees) Steud. -- not accepted
  Pentameris pusilla (Nees) Galley & H. P. Linder -- accepted
  Pentameris rupestris (Nees) Steud. -- accepted
  Pentameris scabra (Nees) Steud. -- accepted
  Pentameris stricta (Schrad.) Nees -- not accepted
  Pentameris tortuosa (Trin.) Nees -- accepted
  Pentameris villosa (Pers.) Nees -- not accepted
  Pentameris viscidula (Nees) Steud. -- accepted
  Pentaschistis (Nees) Spach -- not accepted
  Pentaschistis acinosa var. trunculata (Nees) Stapf -- not accepted
  Pentaschistis ampla (Nees) McClean -- not accepted
  Pentaschistis angustifolia (Nees) Stapf -- not accepted
  Pentaschistis capensis (Nees) Stapf -- not accepted
  Pentaschistis ecklonii (Nees) McClean -- not accepted
  Pentaschistis holciformis (Nees) H. P. Linder -- not accepted
  Pentaschistis microphylla (Nees) McClean -- not accepted
  Pentaschistis pusilla (Nees) H. P. Linder -- not accepted
  Perityle specuicola S.L. Welsh & Neese -- accepted -- alcove rockdaisy
  Persea schiedeana Nees -- accepted -- coyo
  Petalophyllum Nees & Gottsche -- accepted
  Petalophyllum lamellatum (Nees) Lindb. -- not accepted
  Petalophyllum ralfsii (Wilson) Nees & Gottsche -- accepted
  Phaeoceros flexivalvis (Gottsche & Nees) Hässel -- accepted
  Phalaridantha robinsoniana (Nees ex Steud.) St.-Lég. -- not accepted
  Phalaridium Nees & Meyen -- not accepted
  Phalaridium peruvianum Nees & Meyen -- not accepted
  Phalaris angusta Nees -- not accepted
  Phalaris angusta Nees ex Trin. -- accepted -- timothy canarygrass
  Phalaris angusta var. angusta Nees ex Trin. -- not accepted
  Phalaris intermedia var. angusta (Nees ex Trin.) Chapm. -- not accepted
  Phalaris robinsoniana Nees ex Steud. -- not accepted
  Pharus angustifolius (Nees) Döll -- not accepted
  Pharus brasiliensis var. angustifolius Nees -- not accepted
  Pharus brasiliensis var. latifolius Nees -- not accepted
  Pharus micranthus Schrad. ex Nees -- not accepted
  Pharus micranthus var. micranthus Schrad. ex Nees -- not accepted
  Phaseolus bracteatus Nees & Mart. -- not accepted
  Phoebe Nees -- accepted
  Phoebe elongata Nees -- not accepted
  Phragmites capensis Nees -- not accepted
  Phragmites caudatus Nees ex Meyen -- not accepted
  Phragmites communis var. hispanicus (Nees) K. Richt. -- not accepted
  Phragmites hispanicus Nees -- not accepted
  Physalis angulata var. lanceifolia (Nees) Waterf. -- not accepted
  Physalis heterophylla Nees -- accepted -- clammy ground-cherry, clammy groundcherry
  Physalis heterophylla var. heterophylla Nees -- accepted -- clammy groundcherry
  Physalis lanceifolia Nees -- not accepted
  Piptatherum lindleyanum Nees -- not accepted
  Piptatherum macrantherum Nees ex Steud. -- not accepted
  Piptatherum obtusum Nees & Meyen -- not accepted
  Piptatherum ramosum Nees -- not accepted
  Piptochaetium trichotomum (Nees) Griseb. -- not accepted
  Plagiochila abietina (Nees) Mont. & Nees -- accepted
  Plagiochila aculeata (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila ansata (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila bantamensis (Reinw., Blume & Nees) Mont. -- accepted
  Plagiochila blepharophora (Nees) Lindenb. -- accepted
  Plagiochila concava Nees -- accepted
  Plagiochila corrugata (Nees) Nees & Mont. -- accepted
  Plagiochila dichotoma (P. Beauv.) Nees & Mont. -- accepted
  Plagiochila dichotoma var. dichotoma (P. Beauv.) Nees & Mont. -- accepted
  Plagiochila flavescens (Gottsche, Lindenb. & Nees) Gottsche -- accepted
  Plagiochila formosa Nees -- accepted
  Plagiochila frondescens (Nees) Lindenb. -- accepted
  Plagiochila fuscella (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila fuscella var. fuscella (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila gregaria (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila gymnocalycina (Lehm. & Lindenb.) Mont. & Nees -- accepted
  Plagiochila gymnocalycina var. gymnocalycina (Lehm. & Lindenb.) Mont. & Nees -- accepted
  Plagiochila heterodonta (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila incurvicolla (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila incurvicolla var. incurvicolla (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila javanica (Sw.) Nees & Mont. -- accepted
  Plagiochila major (Nees) S.W. Arnell -- not accepted
  Plagiochila minutula (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila montagnei Nees -- accepted
  Plagiochila owaihiensis Nees & Lindenb. -- accepted
  Plagiochila porelloides (Torr. ex Nees) Lindenb. -- accepted
  Plagiochila porelloides var. porelloides (Torr. ex Nees) Lindenb. -- accepted
  Plagiochila renitens (Nees) Lindenb. -- accepted
  Plagiochila retrospectans (Nees) Lindenb. -- accepted
  Plagiochila sciophila Nees -- accepted
  Plagiochila sciophila ssp. sciophila Nees -- accepted
  Plagiochila superba (Nees ex Spreng.) Mont. & Nees -- accepted
  Plagiochila superba var. superba (Nees ex Spreng.) Mont. & Nees -- accepted
  Plagiochila terebrans Nees & Mont. -- accepted
  Plagiochila trapezoidea (Nees) Lindenb. -- accepted
  Plagiochila uncialis (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Plagiochila wightii Nees -- accepted
  Plagiolytrum Nees -- not accepted
  Plectocolea obovata (Nees) Mitt. -- not accepted
  Pleuroclada albescens var. islandica (Nees) Spruce -- not accepted
  Pleurocladula albescens var. islandica (Nees) L. Söderstr. & Vána -- not accepted
  Pleuroplitis plumbea Nees ex Arn. -- not accepted
  Pleuroplitis quartiniana var. plumbea (Nees ex Arn.) Regel -- not accepted
  Pleuropogon californicus (Nees) Benth. ex Vasey -- accepted -- annual semaphoregrass
  Pleuropogon californicus var. californicus (Nees) Benth. ex Vasey -- accepted -- annual semaphoregrass
  Poa airoides (Nees) Kunth -- not accepted
  Poa conformis Nees ex Steud. -- not accepted
  Poa curva Nees ex Steud. -- not accepted
  Poa douglasii Nees -- accepted -- Douglas' bluegrass
  Poa douglasii ssp. douglasii Nees -- not accepted -- Douglas' bluegrass
  Poa lanigera Nees -- accepted
  Poa lanigera var. lanigera Nees -- not accepted
  Poa lepidula (Nees & Meyen) Soreng & L.J. Gillespie -- accepted
  Poa ligularis Nees ex Steud. -- accepted
  Poa ligularis var. ligularis Nees ex Steud. -- not accepted
  Poa lugens (Nees) Kunth -- not accepted
  Poa pachypogon Nees -- not accepted
  Poa phalaroides Nees ex Steud. -- not accepted
  Poa polytricha (Nees) Kunth -- not accepted
  Poa resinulosa Nees ex Steud. -- accepted
  Poa scoparia Nees ex Kunth -- not accepted
  Poa sellowii Nees -- accepted
  Poa solida (Nees) Kunth -- not accepted
  Poagrostis pusilla (Nees) Stapf -- not accepted
  Podosemum brachyphyllum Nees -- not accepted
  Podosemum glaucum Nees -- not accepted
  Podosemum tenuifolium (Kunth) Nees ex Nees & Schauer -- not accepted
  Pogonatherum refractum Nees -- not accepted
  Poidium Nees -- accepted
  Poidium brasiliense Nees ex Steud. -- accepted
  Poidium uniolae (Nees) Matthei -- accepted
  Pollinia imberbis Nees ex Steud. -- not accepted
  Pollinia imberbis var. willdenowiana (Nees ex Steud.) Hack. -- not accepted
  Pollinia praemorsa Nees -- not accepted
  Pollinia praemorsa Nees ex Steud. -- not accepted
  Pollinia willdenowiana (Nees ex Steud.) Benth. -- not accepted
  Polyantherix Nees -- not accepted
  Polyantherix hystrix (Nutt.) Nees -- not accepted
  Polypogon fugax Nees ex Steud. -- accepted -- Asia Minor bluegrass
  Polypogon longiflorus Nees ex Steud. -- not accepted
  Polypogon longiflorus Nees ex Trin. -- not accepted
  Polytrias praemorsa (Nees ex Steud.) Hack. -- not accepted -- Javanese grass
  Polytrias racemosa (Nees) Hack. -- not accepted
  Porella abyssinica (Nees) Trevis. -- accepted
  Porella abyssinica var. abyssinica (Nees) Trevis. -- accepted
  Porella brasiliensis var. ciliata (Gottsche, Lindenb. & Nees) Schiffn. -- accepted
  Porella brasiliensis var. laevior (Gottsche, Lindenb. & Nees) Schiffn. -- accepted
  Porella madagascariensis (Nees & Mont.) Trevis. -- accepted
  Porella mexicana (Hampe ex Gottsche, Lindenb. & Nees) Trevis. -- accepted
  Porella subsquarrosa (Nees & Mont.) Trevis. -- accepted
  Preissia commutata (Lindenb.) Nees -- not accepted
  Preissia quadrata (Scop.) Nees -- not accepted
  Prionachne Nees -- not accepted
  Prionachne dentata (L. f.) Nees -- not accepted
  Prionachne ecklonii Nees -- not accepted
  Prionanthium ecklonii (Nees) Stapf -- not accepted
  Prionolejeunea arguta (Nees) Steph. -- accepted
  Pseudechinolaena spectabilis (Nees ex Trin.) Herter -- not accepted
  Psilocarya rufa Nees -- not accepted
  Psilocarya schiedeana (Nees) Liebm. -- not accepted
  Ptilidium Nees -- accepted
  Ptychanthus Nees -- accepted
  Ptychanthus striatus (Lehm. & Lindenb.) Nees -- accepted
  Ptychanthus striatus var. striatus (Lehm. & Lindenb.) Nees -- accepted
  Pycnolejeunea contigua (Nees) Grolle -- accepted
  Pycnolejeunea macroloba (Nees & Mont.) Schiffn. -- accepted
  Pycreus sanguindentus (Vahl) Nees -- not accepted
  Pycreus sanguinolentus (Vahl) Nees -- not accepted
  Rabdochloa spicata (Nees) Kuntze ex Stuck. -- not accepted
  Raddia distichophylla (Schrad. ex Nees) Chase -- accepted
  Radula aneurismalis (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Radula aquilegia (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Radula boryana (F. Weber) Nees ex Mont. -- accepted
  Radula buccinifera (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Radula cavifolia Hampe ex Gottsche, Lindenb. & Nees -- accepted
  Radula flavifolia (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Radula formosa (C.F.W. Meissn. ex Spreng.) Nees -- accepted
  Radula fulvifolia (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Radula helix (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Radula marginata (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Radula pallens (Sw.) Nees ex Mont. -- accepted
  Radula reflexa Nees & Mont. -- accepted
  Radula uvifera (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Radula xalapensis Nees & Mont. -- accepted
  Ranunculus hydrocharoides var. natans (Nees ex G. Don) L.D. Benson -- not accepted
  Rechsteineria barbata (Nees & Mart.) Kuntze -- not accepted
  Rectolejeunea phyllobola (Nees & Mont.) A. Evans -- not accepted
  Rettbergia capitata Nees ex Döll -- not accepted
  Rhaphis javanica Nees -- not accepted
  Rhaphis javanica Nees ex Steud. -- not accepted
  Rhipidocladum verticillatum (Nees) McClure -- not accepted
  Rhynchelytrum Nees -- not accepted -- Natal redtop
  Rhynchelytrum repens var. roseum (Nees) Chiov. -- not accepted
  Rhynchelytrum roseum (Nees) Stapf & C.E. Hubb. -- not accepted
  Rhynchelytrum roseum (Nees) Stapf & C.E. Hubb. ex Bews -- not accepted
  Rhynchelytrum tonsum (Nees) Lanza & Mattei -- not accepted
  Rhynchoryza subulata (Nees) Baill. -- accepted
  Rhynchospora chinensis Nees & Meyen -- accepted -- spiked beaksedge
  Rhynchospora chinensis ssp. chinensis Nees & Meyen -- accepted -- spiked beaksedge
  Rhynchospora eximia (Nees) Boeckeler -- accepted -- Florida beaksedge, meadow beauty
  Rhynchospora kunthii Nees ex Kunth -- accepted -- Kunth's beaksedge
  Rhynchospora marisculus Nees ex Lindl. & Nees -- accepted -- Caribbean beaksedge
  Rhynchospora rufa (Nees) Boeckeler -- not accepted -- red beaksedge
  Rhynchospora tenerrima Nees ex Spreng. -- accepted -- soldier beaksedge
  Rhynchotechum permolle (Nees) B.L. Burtt -- accepted
  Rhytiglossa androsaemifolia Nees -- not accepted
  Rhytiglossa verticillaris Nees -- not accepted
  Rhytiglossa viridiflora Nees -- not accepted
  Riccardia canaliculata (Nees) Kuntze -- accepted
  Riccardia major (Nees) Lindb. -- not accepted
  Riccardia microscopica (Nees) Kuntze -- accepted
  Riccardia multifida var. ambrosioides (Nees) Carrington & Pearson -- not accepted
  Riccia billardierei Mont. & Nees -- accepted
  Riccia grandis Nees -- accepted
  Riccia junghuhniana Nees & Lindenb. -- accepted
  Riccia junghuhniana var. junghuhniana Nees & Lindenb. -- accepted
  Riccia squamata Nees -- accepted
  Roegneria semicostata (Nees ex Steud.) Kitag. -- not accepted
  Rubus discolor Weihe & Nees -- not accepted -- Himalaya blackberry, Himalayan blackberry
  Rubus fuscus Weihe & Nees ex Bluff & Fingerh. -- not accepted
  Rubus macrophyllus Weihe & Nees -- accepted -- largeleaf blackberry
  Rubus plicatus Weihe & Nees -- accepted
  Rubus vulgaris Weihe & Nees -- accepted
  Ruellia caroliniensis var. dentata (Nees) Fernald -- not accepted
  Ruellia caroliniensis var. parviflora (Nees) S.F. Blake -- not accepted
  Ruellia drummondiana (Nees) A. Gray -- accepted -- Drummond's wild petunia
  Ruellia noctiflora (Nees) A. Gray -- accepted -- nightflowering wild petunia
  Ruellia nudiflora var. humilis (Nees) Leonard -- not accepted
  Ruellia parviflora (Nees) Britton -- not accepted
  Rytidosperma distichum (Nees) Cope -- not accepted
  Rytidosperma pictum (Nees & Meyen) Nicora -- accepted
  Rytidosperma pictum var. pictum (Nees & Meyen) Nicora -- accepted
  Saccharum alopecuroides subvar. angustifolium (Nees) Roberty -- not accepted
  Saccharum alopecuroides subvar. asperum (Nees) Roberty -- not accepted
  Saccharum angustifolium (Nees) Trin. -- accepted
  Saccharum asperum (Nees) Steud. -- accepted
  Saccharum chinense Nees ex Hook. & Arn. -- not accepted
  Saccharum holcoides (Nees) Hack. -- not accepted
  Saccharum narenga (Nees ex Steud.) Wall. ex Hack. -- accepted
  Sacciolepis campestris (Nees) Parodi ex Burkart -- not accepted
  Sacciolepis campestris (Nees) Parodi ex Nicora -- not accepted
  Saccobasis polita (Nees) H. Buch -- accepted
  Saccogynidium rigidulum (Nees) Grolle -- accepted
  Salix exigua var. sericans (Nees) Dorn -- not accepted
  Salix fluviatilis var. sericans (Nees) B. Boivin -- not accepted
  Salix longifolia var. sericans Nees -- not accepted
  Sarcobatus Nees -- accepted -- black greasewood, greasewood
  Sassafras Nees & Eberm. -- accepted -- sassafras
  Sassafras albidum (Nutt.) Nees -- accepted -- sassafras
  Sassafras officinale Nees & Eberm. -- not accepted
  Sauteria Nees -- accepted
  Sauteria alpina (Nees) Nees -- accepted
  Scapania cuspiduligera (Nees) Müll. Frib. -- accepted
  Scapania cuspiduligera var. cuspiduligera (Nees) Müll. Frib. -- accepted
  Scapania irrigua (Nees) Nees -- accepted
  Scapania irrigua ssp. irrigua (Nees) Nees -- accepted
  Scapania irrigua var. irrigua (Nees) Nees -- not accepted
  Scapania rigida Nees -- accepted
  Scapania subalpina (Nees ex Lindenb.) Dumort. -- accepted
  Scapania subalpina var. subalpina (Nees ex Lindenb.) Dumort. -- accepted
  Schiffneriolejeunea pappeana (Nees) Gradst. -- accepted
  Schiffneriolejeunea pappeana var. pappeana (Nees) Gradst. -- accepted
  Schiffneriolejeunea polycarpa (Nees) Gradst. -- accepted
  Schiffneriolejeunea tumida (Nees) Gradst. -- accepted
  Schiffneriolejeunea tumida var. tumida (Nees) Gradst. -- accepted
  Schismus arabicus Nees -- accepted -- Arabian schismus
  Schismus arabicus var. arabicus Nees -- not accepted
  Schismus barbatus ssp. arabicus (Nees) Maire & Weiller -- not accepted
  Schismus barbatus var. arabicus (Nees) J.P. Sm. -- not accepted
  Schismus brevifolius Nees -- not accepted
  Schismus calycinus var. arabicus (Nees) Kuntze -- not accepted
  Schismus ovalis Nees -- not accepted
  Schismus scaberrimus Nees -- accepted
  Schismus scaberrimus var. nanus Nees -- not accepted
  Schistidium apocarpum var. gracile (Web. & Mohr ex Nees et al.) Bruch & Schimp. in B.S.G. -- not accepted
  Schistidium gracile (Web. & Mohr ex Nees et al.) Schleich. ex Limpr. -- not accepted
  Schistochila aligera (Nees & Blume) J.B. Jack & Steph. -- accepted
  Schistochila aligera var. aligera (Nees) Schiffn. -- accepted
  Schistochila aligera var. laxa (Nees) Schiffn. -- accepted
  Schistochila blumei (Nees) Trevis. -- accepted
  Schistochila leucophylla (Lehm. ex Gottsche, Lindenb. & Nees) Steph. -- accepted
  Schistochila reinwardtii (Nees) Schiffn. -- accepted
  Schistochila sciurea (Nees) Schiffn. -- accepted
  Schizachyrium Nees -- accepted -- bluestem, little bluestem
  Schizachyrium brevifolium (Sw.) Nees ex Büse -- accepted -- serillo dulce
  Schizachyrium condensatum (Kunth) Nees -- accepted -- bush beargrass, Colombian bluestem, little bluestem
  Schizachyrium condensatum var. intermedium (Nees) Roberty -- not accepted
  Schizachyrium filiforme Nees -- not accepted
  Schizachyrium hirtiflorum Nees -- not accepted
  Schizachyrium intermedium Nees -- not accepted
  Schizachyrium sanguineum subvar. hirtiflorum (Nees) Roberty -- not accepted
  Schizachyrium sanguineum subvar. semiberbe (Nees) Roberty -- not accepted
  Schizachyrium sanguineum var. hirtiflorum (Nees) S.L. Hatch -- not accepted -- crimson bluestem, crimson false bluestem
  Schizachyrium semiberbe Nees -- not accepted
  Schizachyrium semiberbe var. humile Nees -- not accepted
  Schizachyrium tenerum Nees -- accepted -- slender bluestem, slender little bluestem
  Schizachyrium tenerum var. filiforme (Nees) Roberty -- not accepted
  Schizophyllopsis bidens (Reinw., Blume & Nees) Vána & L. Söderstr. -- accepted
  Schizostachyum Nees -- accepted -- Polynesian 'ohe
  Scirpus chilensis Nees & Meyen ex Kunth -- not accepted
  Scirpus micranthus var. drummondii (Nees) Mohlenbr. -- not accepted
  Scleria ciliaris Nees -- accepted -- nutrush
  Scleria microcarpa Nees ex Kunth -- accepted -- tropical nutrush
  Scleria microcarpum Nees ex Kunth -- not accepted
  Scleria scindens Nees -- accepted -- hairy nutrush
  Scleria scrobiculata Nees & Meyen -- accepted -- nutrush
  Scleria testacea Nees -- accepted -- Hawai'i nutrush
  Sclerochloa arenaria (Retz.) Nees -- not accepted
  Senecio palmensis (Nees) C. Sm. ex Link -- not accepted
  Senna macranthera var. micans (Nees) H.S. Irwin & Barneby -- accepted
  Sericocarpus tortifolius (Michx.) Nees -- accepted -- Dixie whitetop aster
  Sesleria americana Nees ex Steud. -- not accepted
  Setaria crus-ardeae (Willd. ex Nees) Kunth -- not accepted
  Setaria flava (Nees) Kunth -- not accepted
  Setaria glauca var. penicillata (Willd. ex Nees) Griseb. -- not accepted
  Setaria gracilis f. penicillata (Willd. ex Nees) Mez ex Ekman -- not accepted
  Setaria gracilis var. dasyura (Willd. ex Nees) Arechav. -- not accepted
  Setaria impressa (Nees) Kunth -- not accepted
  Setaria lachnea (Nees) Kunth -- accepted
  Setaria leiophylla (Nees) Kunth -- not accepted
  Setaria lutescens var. flava (Nees) Yamamoto -- not accepted
  Setaria nigrirostris (Nees) T. Durand & Schinz -- accepted -- black bristlegrass
  Setaria penicillata (Willd. ex Nees) J. Presl -- not accepted
  Setaria scabrifolia (Nees) Kunth -- accepted
  Setaria semirugosa (Nees) Kunth -- not accepted
  Setaria setosa var. leiophylla (Nees) Arechav. -- accepted -- West Indian bristlegrass
  Setaria speciosa (Nees ex Trin.) Kuhlm. -- not accepted
  Setaria tejucensis (Nees) Kunth -- not accepted
  Sieglingia spicata (Nees) Kuntze ex Stuck. -- not accepted
  Silene coniflora Nees ex DC. -- accepted -- manynerve catchfly
  Sinarundinaria falcata (Nees) C.S. Chao & Renvoize -- not accepted
  Sinningia Nees -- accepted
  Sinningia barbata (Nees & Mart.) Nichols. -- accepted
  Sinningia helleri Nees -- accepted
  Sinningia macrophylla (Nees & Mart.) Benth. & Hook. f. ex Fritsch -- accepted
  Siphonoglossa dipteracantha (Nees) A. Heller -- not accepted
  Siphonoglossa pilosella (Nees) Torr. -- not accepted -- hairy tubetongue
  Solanum barbisetum Nees -- accepted
  Solanum wightii Nees -- accepted
  Solenostoma comatum (Nees) C. Gao -- accepted
  Solenostoma comatum var. comatum (Nees) C. Gao -- accepted
  Solenostoma confertissimum (Nees) Schljakov -- accepted
  Solenostoma crassulum (Nees & Mont.) Steph. -- accepted
  Solenostoma haskarlianum (Nees) R.M. Schust. ex Vána & D.G. Long -- accepted
  Solenostoma obovatum (Nees) C. Massal. -- accepted
  Solenostoma sphaerocarpa var. nana (Nees) R.M. Schust. -- not accepted
  Solenostoma sphaerocarpum var. nanum (Nees ex Flot.) Müll. Frib. -- not accepted
  Solenostoma triste (Nees) Müll. Frib. -- not accepted
  Solenostoma truncatum (Nees) R.M. Schust. ex Vána & D.G. Long -- accepted
  Solenostoma truncatum var. truncatum (Nees) R.M. Schust. ex Vána & D.G. Long -- accepted
  Sorengia caricoides (Nees ex Trin.) Zuloaga & Morrone -- not accepted
  Sorengia longifolia ssp. rigidula (Bosc ex Nees) Zuloaga & Morrone -- not accepted
  Sorengia prionitis (Nees) Zuloaga & Morrone -- not accepted
  Sorghastrum minarum (Nees) Hitchc. -- accepted
  Sorghastrum scaberrimum (Nees) Herter -- accepted
  Sorghum bicolor ssp. drummondii (Nees ex Steud.) de Wet ex Davidse -- not accepted -- broom-corn, Drummond broomcorn, Drummond's broomcorn, shattercane, Sudangrass
  Sorghum bicolor var. drummondii (Nees ex Steud.) Mohlenbr. -- not accepted
  Sorghum condensatum var. intermedium (Nees) Kuntze -- not accepted
  Sorghum drummondii (Nees) Hack. ex Beetle -- not accepted
  Sorghum drummondii Nees ex Hack. -- not accepted
  Sorghum hirtiflorum (Nees) Kuntze -- not accepted
  Sorghum laxum (Nees) Kuntze -- not accepted
  Sorghum minarum (Nees) Hack. -- not accepted
  Sorghum nutans ssp. scaberrimum (Nees) Hack. -- not accepted
  Sorghum nutans subvar. minarum (Nees) Roberty -- not accepted
  Sorghum nutans subvar. scaberrimum (Nees) Roberty -- not accepted
  Sorghum rufum (Nees) Kuntze -- not accepted
  Sorghum saccharoides var. leucopogon (Nees) Nash ex Kuntze -- not accepted
  Sorghum semiberbe (Nees) Kuntze -- not accepted
  Sorghum tenerum (Nees) Kuntze -- not accepted
  Sorghum vulgare var. drummondii (Nees ex Steud.) Hack. ex Chiov. -- not accepted
  Sorghum vulgare var. drummondii (Nees ex Steud.) Hitchc. -- not accepted
  Sorghum X drummondii (Nees ex Steud.) Millsp. & Chase -- accepted -- Sudangrass
  Spartina capensis Nees ex Trin. -- not accepted
  Sphagnum cuspidatum var. plumosum Nees & Hornsch. -- not accepted
  Sphagnum rufescens Nees ex Nees & Hornsch. -- not accepted
  Sphagnum subsecundum Nees in Sturm -- accepted -- sphagnum
  Sphagnum subsecundum var. rufescens (Nees & Hornsch.) Hüb. -- not accepted
  Sphagnum subsecundum var. subsecundum Nees in Sturm -- accepted -- sphagnum
  Sphenolobus helleranus (Nees ex Lindenb.) Steph. -- not accepted
  Sphenolobus politus (Nees) Steph. -- not accepted
  Spiridens Nees -- accepted
  Spirogyra Link In C. G. Nees, 1820 -- accepted
  Spodiopogon latifolius (Spreng.) Nees -- not accepted
  Spodiopogon villosus Nees -- not accepted
  Sporobolus argutus (Nees) Kunth -- not accepted
  Sporobolus asperifolius (Nees & Meyen ex Trin.) Nees & Meyen -- not accepted
  Sporobolus eximius (Nees ex Trin.) Ekman -- accepted
  Sporobolus fimbriatus (Trin.) Nees -- accepted -- fringed dropseed
  Sporobolus matrella Nees -- not accepted
  Spruceanthus semirepandus (Nees) Verd. -- accepted
  Spruceanthus sulcatus (Nees) Gradst. -- accepted
  Steinchisma decipiens (Nees ex Trin.) W.V. Br. -- accepted
  Stenactis annua (L.) Nees -- not accepted
  Stenandrium Nees -- accepted -- shaggytuft
  Stenandrium dulce (Cav.) Nees -- accepted -- sweet shaggytuft
  Stenandrium dulce var. dulce (Cav.) Nees -- accepted -- sweet shaggytuft
  Stenotaphrum sarmentosum Nees -- not accepted
  Stethoma verticillaris (Nees) Britton -- not accepted
  Stipa eminens Nees -- not accepted
  Stipa eminens var. sellowiana (Nees ex Trin. & Rupr.) Kuntze -- not accepted
  Stipa filifolia Nees -- not accepted
  Stipa hyalina Nees -- not accepted
  Stipa ichu var. pungens (Nees & Meyen) Kuntze -- not accepted
  Stipa ichu var. pungens (Nees & Meyen) Pilg. -- not accepted
  Stipa leiocarpa Nees ex Steud. -- not accepted
  Stipa neaei Nees ex Steud. -- not accepted
  Stipa obtusa (Nees & Meyen) Hitchc. -- not accepted
  Stipa panicoides Nees -- not accepted
  Stipa papposa Nees -- not accepted
  Stipa plumosula Nees ex Steud. -- not accepted
  Stipa pungens Nees & Meyen -- not accepted
  Stipa retorta (Nees ex Steud.) Mez -- not accepted
  Stipa sellowiana Nees ex Trin. & Rupr. -- not accepted
  Stipa trichotoma Nees -- not accepted -- nassella tussock
  Stipa trochlearis Nees & Meyen -- not accepted
  Strephium Schrad. ex Nees -- not accepted
  Strephium distichophyllum Schrad. ex Nees -- not accepted
  Streptochaeta Schrad. ex Nees -- accepted
  Streptochaeta spicata Schrad. ex Nees -- accepted
  Streptochaeta spicata ssp. spicata Schrad. ex Nees -- accepted
  Strobilanthes anisophylla f. isophylla (Nees) J.R.I. Wood -- not accepted -- bedding conehead
  Symbiezidium transversale var. hookerianum (Gottsche, Lindenb. & Nees) Gradst. & J. Beek -- accepted
  Symphyogyna Nees & Mont. -- accepted
  Symphyogyna brasiliensis (Nees) Nees & Mont. -- accepted
  Symphyogyna brasiliensis var. angustior (Gottsche, Lindenb. & Nees) Gottsche -- accepted
  Symphyogyna brasiliensis var. brasiliensis (Nees) Nees & Mont. -- accepted
  Symphyogyna circinata Nees & Mont. -- accepted
  Symphyogyna hochstetteri Nees & Mont. -- accepted
  Symphyogyna hymenophyllum (Hook.) Nees & Mont. -- accepted
  Symphyogyna hymenophyllum var. hymenophyllum (Hook.) Nees & Mont. -- accepted
  Symphyogyna oblonga (Schwein.) Gottsche Lindenb. & Nees -- not accepted
  Symphyogyna podophylla (Thunb.) Nees & Mont. -- accepted
  Symphyogyna rhodina (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Symphyogyna schweinitzii Mont. & Nees -- not accepted
  Symphyogyna sinuata (Sw.) Nees & Mont. -- accepted
  Symphyogyna ulvoides (Reinw., Blume & Nees) Nees -- accepted
  Symphyogynopsis gottscheana (Mont. & Nees) Grolle -- accepted
  Symphyotrichum Nees -- accepted -- aster
  Symphyotrichum chilense (Nees) G.L. Nesom -- accepted -- Pacific aster
  Symphyotrichum chilense var. chilense (Nees) G.L. Nesom -- not accepted -- Pacific aster
  Symphyotrichum firmum (Nees) G.L. Nesom -- accepted -- glossy-leaved aster
  Symphyotrichum laeve var. purpuratum (Nees) G.L. Nesom -- accepted -- smooth blue aster
  Symphyotrichum subspicatum (Nees) G.L. Nesom -- accepted -- Douglas aster
  Symphyotrichum subspicatum var. subspicatum (Nees) G.L. Nesom -- not accepted -- Douglas aster
  Symphyotrichum subulatum var. parviflorum (Nees) S.D. Sundb. -- accepted -- southwestern annual saltmarsh aster
  Syntherisma adusta (Nees) Chase -- not accepted
  Syntherisma chinense (Nees) Hitchc. -- not accepted
  Syntherisma chinensis (Nees) Hitchc. -- not accepted
  Syzygiella rubricaulis (Nees) Steph. -- accepted
  Syzygiella securifolia (Nees) Inoue -- accepted
  Syzygiella subintegerrima (Reinw., Blume & Nees) Spruce -- accepted
  Tapeinotes barbata (Nees & Mart.) DC. -- not accepted
  Tapina barbata (Nees & Mart.) Mart. -- not accepted
  Teliostachya Nees -- accepted
  Teliostachya alopecuroidea (Vahl) Nees -- not accepted -- pata de gallina
  Teliostachys Nees -- not accepted
  Teliostachys alopecuroidea (Vahl) Nees -- not accepted
  Tenaxia disticha (Nees) N. P. Barker & H. P. Linder -- accepted
  Tetrachne Nees -- accepted
  Tetrachne dregei Nees -- accepted
  Tetramerium Nees -- accepted
  Tetramerium hispidum Nees -- not accepted
  Tetramerium nervosum Nees -- accepted -- hairy fournwort
  Tetramerium nervosum var. hispidum (Nees) Torr. -- not accepted
  Tetramolopium Nees -- accepted -- tetramolopium
  Tetramolopium tenerrimum (Less.) Nees -- accepted -- Oahu tetramolopium
  Thrasya cultrata (Trin.) Nees -- not accepted
  Thrasya hirsuta Nees -- not accepted
  Thrasyopsis repanda (Nees) Parodi -- accepted
  Thyridostachyum Nees -- not accepted
  Thyrsacanthus cuspidatus Nees -- not accepted
  Thyrsacanthus nitidus (Jacq.) Nees -- not accepted
  Thyrsacanthus strictus Nees -- not accepted
  Thysananthus anguiformis (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Thysananthus retusus (Reinw., Blume & Nees) B.M. Thiers & Gradst. -- accepted
  Thysananthus retusus ssp. retusus (Reinw., Blume & Nees) B.M. Thiers & Gradst. -- accepted
  Thysananthus spathulistipus (Reinw., Blume & Nees) Lindenb. -- accepted
  Thysanolaena Nees -- accepted
  Thysanolaena acarifera (Trin.) Arn. & Nees -- not accepted
  Thysanolaena agrostis Nees -- not accepted
  Tithymalus esuliformis (S. Schauer ex Nees & S. Schauer) Klotzsch & Garcke -- not accepted
  Torulinium odoratum ssp. auriculatum (Nees & Meyen ex Kunth) T. Koyama -- not accepted
  Trachypogon Nees -- accepted -- crinkleawn, crinkleawn grass
  Trachypogon angustifolius Nees ex Hack. -- not accepted
  Trachypogon argenteus (DC.) Nees -- not accepted
  Trachypogon avenaceus Nees -- not accepted
  Trachypogon canescens Nees -- not accepted
  Trachypogon capensis subvar. mollis (Nees) Roberty -- not accepted
  Trachypogon dissoluta Nees -- not accepted
  Trachypogon hirtus (L.) Nees -- not accepted
  Trachypogon laguroides (DC.) Nees -- not accepted
  Trachypogon ligularis Nees -- not accepted
  Trachypogon minarum Nees -- not accepted
  Trachypogon mollis Nees -- not accepted
  Trachypogon montufari (Kunze) Nees -- not accepted -- sideflower crinkleawn
  Trachypogon montufarii (Kunth) Nees -- not accepted
  Trachypogon montufarii var. mollis (Nees) Burkart -- not accepted
  Trachypogon montufarii var. mollis (Nees) E. Fourn. ex Hemsl. -- not accepted
  Trachypogon montufarii var. mollis (Nees) Andersson -- not accepted
  Trachypogon montufarii var. montufarii (Kunth) Nees -- not accepted
  Trachypogon montupari (H. B. K.) Nees -- not accepted
  Trachypogon plumosus (Humb. & Bonpl. ex Willd.) Nees -- not accepted
  Trachypogon polymorphus subvar. mollis (Nees) Hack. -- not accepted
  Trachypogon polymorphus var. canescens (Nees) Hack. -- not accepted
  Trachypogon polymorphus var. dissolutus (Nees) Hack. -- not accepted
  Trachypogon polymorphus var. ligularis (Nees) Hack. -- not accepted
  Trachypogon rufus Nees -- not accepted
  Trachypogon scaberrimus Nees -- not accepted
  Trachypogon schoenanthus (L.) Nees -- not accepted
  Trachypogon scrobiculatus Nees -- not accepted
  Trachypogon stipoides (Kunth) Nees -- not accepted
  Tragus occidentalis Nees -- not accepted
  Tribolium acutiflorum (Nees) Renvoize -- accepted
  Tribolium brachystachyum (Nees) Renvoize -- accepted
  Tribolium curvum (Nees) Verboom & H. P. Linder -- accepted
  Tribolium obtusifolium (Nees) Renvoize -- accepted
  Tribolium pusillum (Nees) H. P. Linder & Davidse -- accepted
  Tribolium tenellum (Nees) Verboom & H. P. Linder -- accepted
  Tribolium utriculosum (Nees) Renvoize -- accepted
  Trichachne Nees -- not accepted
  Trichachne ferruginea Nees -- not accepted
  Trichachne insularis (L.) Nees -- not accepted
  Trichachne recalva Nees -- not accepted
  Trichachne sacchariflora Nees -- not accepted
  Trichachne tenuis Nees -- not accepted
  Trichachne velutina Nees -- not accepted
  Trichocolea pluma (Reinw., Blume & Nees) Mont. -- accepted
  Trichodium pusillum Nees ex Meyen -- not accepted
  Tricholaena repens var. rosea (Nees) Alberts. -- not accepted
  Tricholaena rosea Nees -- not accepted
  Tricholaena tonsa Nees -- not accepted
  Trichosporum albidum (Blume) Nees -- not accepted
  Trichosporum angustifolium (Blume) Nees -- not accepted
  Trichosporum radicans (Jack) Nees -- not accepted
  Trichosporum volubile (Jack) Nees -- not accepted
  Tridens brasiliensis (Nees ex Steud.) Parodi -- accepted
  Tridens brasiliensis Nees ex Steud. -- not accepted
  Tridens virens Nees -- not accepted
  Triodia brasiliensis (Nees ex Steud.) Lindm. -- not accepted
  Tripogon spicatus (Nees) Ekman -- accepted -- American fiveminute grass
  Tripolium Nees -- accepted -- sea aster
  Tripolium subulatum var. parviflorum Nees -- not accepted
  Triraphis capensis Nees -- not accepted
  Trisetum cumingii (Nees ex Steud.) Nicora -- accepted
  Trisetum cumingii var. cumingii (Nees ex Steud.) Nicora -- not accepted
  Trisetum spicatum var. cumingii (Nees ex Steud.) Finot -- accepted
  Tristachya Nees -- accepted
  Tristachya chrysothrix Nees -- not accepted
  Tristachya chrysothrix f. chrysothrix Nees -- not accepted
  Tristachya leiostachya Nees -- accepted
  Tristegis glutinosa Nees -- not accepted
  Triticum divergens Nees ex Steud. -- not accepted
  Triticum repens var. subulatum (Roem. & Schult.) Nees -- not accepted
  Tritomaria polita (Nees) Jřrg. -- not accepted
  Tritomaria polita var. polita (Nees) Jřrg. -- not accepted
  Umbellularia (Nees) Nutt. -- accepted -- California laurel, Californian bay
  Uniola ornithorhyncha (Nees) Steud. -- not accepted
  Uniola ornithoryncha (Nees) Steud. -- not accepted
  Uniola scoparia (Nees ex Kunth) Steud. -- not accepted
  Urachne macrathera Nees ex Steud. -- not accepted
  Urachne obtusa (Nees & Meyen) Trin. & Rupr. -- not accepted
  Urachne panicoides Nees ex Trin. -- not accepted
  Urachne panicoides Trin. ex Nees -- not accepted
  Urachne panicoides var. panicoides Nees ex Trin. -- not accepted
  Urachne trichotoma (Nees) Trin. -- not accepted
  Uralepis brasiliensis Nees ex Steud. -- not accepted
  Uralepis verticillata (Nees & Meyen) Steud. -- not accepted
  Uralepis virens (Nees) Kunth -- not accepted
  Uralepsis verticillata (Nees & Meyen) Steud. -- not accepted
  Urochlaena Nees -- not accepted
  Urochloa megastachya (Nees ex Trin.) Morrone & Zuloaga -- accepted
  Vicia americana var. angustifolia Nees -- not accepted
  Vilfa arguta Nees -- not accepted
  Vilfa asperifolia Nees & Meyen ex Trin. -- not accepted
  Vilfa clandestina (Biehler) Nees ex Steud. -- not accepted
  Vilfa eximia Nees ex Trin. -- not accepted
  Vilfa matrella Nees -- not accepted
  Vulpia australis (Nees ex Steud.) C.H. Blom -- accepted
  Vulpia australis var. australis (Nees ex Steud.) C.H. Blom -- not accepted
  Vulpia muralis (Kunth) Nees -- accepted
  Vulpia ulochaeta Nees ex Döll -- not accepted
  Wirtgenia paspaloides Nees ex Döll -- not accepted
  Xylolejeunea crenata (Nees & Mont.) Xiao L. He & Grolle -- accepted
  Yeatesia viridiflora (Nees) Small -- accepted -- yellow bractspike
  Yucca harrimaniae var. sterilis Neese & S.L. Welsh -- not accepted -- Spanish bayonet
  Zizania microstachya Nees ex Trin. -- not accepted
  Zizaniopsis microstachya (Nees ex Trin.) Döll & Asch. -- accepted
  Zoopsis argentea (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
  Zoopsis argentea var. argentea (Hook.f. & Taylor) Gottsche, Lindenb. & Nees -- accepted
   

A gray bar