Integrated Taxonomic Information System - Search Results

Results of: Search in every Kingdom for Taxon Author(s) Name(s) containing 'Howell'
 
 Kingdom Animalia
  Agelaius phoeniceus grinnelli A. B. Howell, 1917 – valid
  Sigmodon hispidus cienegae A. B. Howell, 1919 – invalid
  Zapus trinotatus eureka A. B. Howell, 1920 – invalid
  Phenacomys silvicolus A. B. Howell, 1921 – invalid
  Microtus mordax abditus A. B. Howell, 1923 – invalid
  Phenacomys intermedius celsus A. B. Howell, 1923 – invalid
  Phenacomys intermedius levis A. B. Howell, 1923 – invalid
  Petaurista philippensis rubricundus A. B. Howell, 1927 – valid
  Rattus humiliatus insolatus A. B. Howell, 1927 – invalid
  Rattus rattus exiguus A. B. Howell, 1927 – invalid
  Euchoreutes naso alashanicus A. B. Howell, 1928 – invalid
  Rattus humiliatus sowerbyi A. B. Howell, 1928 – invalid
  Agelaius phoeniceus littoralis A. H. Howell & Van Rossem, 1928 – valid
  Agelaius phoeniceus mearnsi A. H. Howell & Van Rossem, 1928 – valid
  Myotis grisescens A. H. Howell, 1909 – valid – Gray Myotis, Gray Bat
  Neotoma floridana illinoensis A. H. Howell, 1910 – invalid
  Pipilo erythrophthalmus canaster A. H. Howell, 1913 – valid
  Marmota caligata cascadensis A. H. Howell, 1914 – valid
  Marmota caligata sheldoni A. H. Howell, 1914 – invalid – Montague Island hoary marmot
  Marmota flaviventris luteola A. H. Howell, 1914 – valid
  Marmota flaviventris nosophora A. H. Howell, 1914 – valid
  Marmota flaviventris obscura A. H. Howell, 1914 – valid
  Marmota monax preblorum A. H. Howell, 1914 – valid
  Marmota monax rufescens A. H. Howell, 1914 – valid
  Reithrodontomys (Aporodon) A. H. Howell, 1914 – valid
  Reithrodontomys alleni A. H. Howell, 1914 – invalid
  Reithrodontomys amoles A. H. Howell, 1914 – invalid
  Reithrodontomys fulvescens chiapensis A. H. Howell, 1914 – invalid
  Reithrodontomys fulvescens mustelinus A. H. Howell, 1914 – invalid
  Reithrodontomys fulvescens nelsoni A. H. Howell, 1914 – invalid
  Reithrodontomys rufescens luteolus A. H. Howell, 1914 – invalid
  Eoglaucomys A. H. Howell, 1915 – valid
  Glaucomys sabrinus bullatus A. H. Howell, 1915 – invalid
  Glaucomys sabrinus canescens A. H. Howell, 1915 – valid
  Glaucomys sabrinus columbiensis A. H. Howell, 1915 – valid – Okanagan flying squirrel
  Glaucomys sabrinus flaviventris A. H. Howell, 1915 – valid – yellow-bellied flying squirrel
  Glaucomys sabrinus latipes A. H. Howell, 1915 – valid – broad-footed flying squirrel
  Glaucomys volans saturatus A. H. Howell, 1915 – valid – southeastern flying squirrel
  Glaucomys volans texensis A. H. Howell, 1915 – valid – Texas flying squirrel
  Marmota flaviventris parvula A. H. Howell, 1915 – valid
  Marmota flaviventris sierrae A. H. Howell, 1915 – valid
  Marmota monax petrensis A. H. Howell, 1915 – valid
  Marmota monax pretensis A. H. Howell, 1915 – invalid
  Microtus parvulus (A. H. Howell, 1916) – invalid
  Microtus pinetorum parvulus (A. H. Howell, 1916) – invalid
  Pitymys parvulus A. H. Howell, 1916 – invalid
  Callospermophilus lateralis caryi A. H. Howell, 1917 – invalid
  Ammodramus maritimus mirabilis (A. H. Howell, 1919) – invalid – Cape Sable Seaside Sparrow
  Ammospiza maritima mirabilis (A. H. Howell, 1919) – valid – Cape Sable Seaside Sparrow
  Sciurus niger avicennia A. H. Howell, 1919 – valid – Big Cypress fox squirrel
  Sciurus niger avicinnia A. H. Howell, 1919 – invalid
  Thryospiza mirabilis A. H. Howell, 1919 – invalid
  Neofiber alleni nigrescens A. H. Howell, 1920 – invalid
  Peromyscus leucocephalus A. H. Howell, 1920 – invalid
  Peromyscus polionotus leucocephalus A. H. Howell, 1920 – invalid
  Tamias ruficaudus (A. H. Howell, 1920) – valid – Red-tailed Chipmunk
  Tamias ruficaudus ruficaudus (A. H. Howell, 1920) – valid
  Tamias amoenus vallicola (A. H. Howell, 1922) – valid
  Tamias durangae solivagus (A. H. Howell, 1922) – valid
  Tamias minimus arizonensis (A. H. Howell, 1922) – valid
  Tamias ruficaudus simulans (A. H. Howell, 1922) – valid
  Tamias siskiyou (A. H. Howell, 1922) – valid – Siskiyou Chipmunk
  Tamias siskiyou siskiyou (A. H. Howell, 1922) – valid
  Tamias sonomae alleni (A. H. Howell, 1922) – valid
  Tamias speciosus sequoiensis (A. H. Howell, 1922) – valid
  Tamias amoenus ochraceus (A. H. Howell, 1925) – valid
  Tamias minimus confinis (A. H. Howell, 1925) – valid
  Tamias minimus grisescens (A. H. Howell, 1925) – valid
  Tamias minimus jacksoni (A. H. Howell, 1925) – valid
  Tamias striatus fisheri A. H. Howell, 1925 – valid
  Tamias sibiricus umbrosus (A. H. Howell, 1927) – valid
  Ictidomys tridecemlineatus arenicola (A. H. Howell, 1928) – valid
  Ictidomys tridecemlineatus monticola (A. H. Howell, 1928) – valid – White Mountains ground squirrel
  Spermophilus brunneus (A. H. Howell, 1928) – invalid – northern Idaho ground squirrel, Idaho Ground Squirrel
  Spermophilus brunneus brunneus (A. H. Howell, 1928) – invalid – northern Idaho ground squirrel
  Spermophilus elegans nevadensis (A. H. Howell, 1928) – invalid
  Spermophilus tridecemlineatus monticola (A. H. Howell, 1928) – invalid
  Urocitellus brunneus (A. H. Howell, 1928) – valid – Idaho Ground Squirrel
  Urocitellus brunneus brunneus (A. H. Howell, 1928) – valid – northern Idaho ground squirrel
  Urocitellus columbianus ruficaudus (A. H. Howell, 1928) – valid
  Urocitellus elegans nevadensis (A. H. Howell, 1928) – valid
  Xerospermophilus spilosoma pallescens (A. H. Howell, 1928) – valid
  Neotamias A. H. Howell, 1929 – invalid
  Tamias (Neotamias) A. H. Howell, 1929 – valid
  Tamiasciurus hudsonicus abieticola (A. H. Howell, 1929) – valid
  Dendroica discolor paludicola A. H. Howell, 1930 – invalid
  Setophaga discolor paludicola (A. H. Howell, 1930) – valid
  Ammospermophilus leucurus pennipes A. H. Howell, 1931 – valid
  Callospermophilus lateralis connectens (A. H. Howell, 1931) – valid
  Callospermophilus lateralis mitratus (A. H. Howell, 1931) – valid
  Otospermophilus beecheyi parvulus (A. H. Howell, 1931) – valid
  Reithrodontomys mexicanus lucifrons A. H. Howell, 1932 – invalid
  Reithrodontomys mexicanus minusculus A. H. Howell, 1932 – invalid
  Glaucomys sabrinus griseifrons A. H. Howell, 1934 – valid – Prince of Wales flying squirrel, Prince of Wales Island flying squirrel
  Neotoma floridana haematoreia A. H. Howell, 1934 – invalid
  Tamiasciurus hudsonicus columbiensis A. H. Howell, 1936 – valid
  Tamiasciurus hudsonicus kenaiensis A. H. Howell, 1936 – valid
  Tamiasciurus hudsonicus preblei A. H. Howell, 1936 – valid
  Tamiasciurus hudsonicus regalis A. H. Howell, 1936 – valid
  Notocitellus A. H. Howell, 1938 – valid – tropical ground squirrels
  Otospermophilus beecheyi sierrae (A. H. Howell, 1938) – valid
  Poliocitellus A. H. Howell, 1938 – valid – Franklin's ground squirrel
  Spermophilus washingtoni (A. H. Howell, 1938) – invalid – Washington Ground Squirrel
  Spermophilus washingtoni loringi (A. H. Howell, 1938) – invalid
  Urocitellus washingtoni (A. H. Howell, 1938) – valid – Washington Ground Squirrel
  Peromyscus gossypinus restrictus A. H. Howell, 1939 – invalid
  Peromyscus nuttalli lewisi A. H. Howell, 1939 – invalid
  Peromyscus polionotus decoloratus A. H. Howell, 1939 – invalid
  Peromyscus polionotus peninsularis A. H. Howell, 1939 – invalid – St. Andrew beach mouse
  Reithrodontomys humulis virginianus A. H. Howell, 1940 – invalid
  Tamiasciurus hudsonicus pallescens A. H. Howell, 1942 – valid
  Sigmodon hispidus floridanus A. H. Howell, 1943 – invalid
  Sigmodon hispidus insulicola A. H. Howell, 1943 – invalid
  Amazona auropalliata parvipes B. L. Monroe Jr & T. R. Howell, 1966 – valid
  Amazona oratrix belizensis B. L. Monroe Jr & T. R. Howell, 1966 – valid
  Pseudothrips beckhami Beshear and Howell, 1976 – valid
  Scotinomys teguina stenopygius Buchanan and T. R. Howell, 1967 – invalid
  Arthroleptides yakusini Channing, Moyer and Howell, 2002 – valid
  Petropedetes yakusini (Channing, Moyer and Howell, 2002) – invalid
  Phrynobatrachus uzungwensis Grandison and Howell, 1983 – valid
  Loligo hemiptera Howell, 1867 – invalid
  Octopus filosa Howell, 1867 – invalid
  Octopus filosus Howell, 1867 – valid
  Chincha occidentalis major Howell, 1901 – invalid
  Chincha occidentalis notata Howell, 1901 – invalid
  Chincha platyrhina Howell, 1901 – invalid
  Mephitis mephitis major (Howell, 1901) – valid
  Mephitis mephitis notata (Howell, 1901) – valid
  Spilogale angustifrons Howell, 1902 – valid – Southern Spotted Skunk
  Spilogale angustifrons angustifrons Howell, 1902 – valid
  Spilogale angustifrons tropicalis Howell, 1902 – valid
  Spilogale tenuis Howell, 1902 – invalid
  Spilogale angustifrons elata Howell, 1906 – valid
  Spilogale microdon Howell, 1906 – invalid
  Corvus brachyrhynchos paulus Howell, 1913 – invalid
  Mustela frenata olivacea Howell, 1913 – valid
  Mustela peninsulae olivacea Howell, 1913 – invalid
  Marmota caligata nivaria Howell, 1914 – invalid
  Ochotona princeps nevadensis Howell, 1919 – invalid
  Ochotona princeps goldmani Howell, 1924 – invalid
  Myotis siligorensis sowerbyi Howell, 1926 – invalid
  Myotis sowerbyi Howell, 1926 – valid – Sowerby's Whiskered Myotis
  Lepus grahami Howell, 1928 – invalid
  Ochotona argentata Howell, 1928 – valid – Silver Pika, Helan Shan Pika
  Pithecus pullus Howell, 1928 – invalid
  Selenarctos thibetanus wulsini Howell, 1928 – invalid
  Scalopus aquaticus bassi Howell, 1939 – valid – Englewood mole
  Wadotes georgiensis Howell, 1974 – valid
  Etheostoma nuchale Howell and Caldwell, 1965 – valid – Watercress Darter
  Etheostoma neopterum Howell and Dingerkus, 1978 – valid – Lollipop Darter, Lollypop Darter
  Cyprinella gibbsi (Howell and Williams, 1971) – valid – Tallapoosa shiner
  Notropis gibbsi Howell and Williams, 1971 – invalid – Tallapoosa shiner
  Ijimaia antillarum Howell Rivero, 1935 – valid – jellynose
  Ijimaia fowleri Howell Rivero, 1935 – valid
  Caulolatilus intermedius Howell Rivero, 1936 – valid – anchor tilefish, tumba parda, blanquillo payaso
  Chimaera cubana Howell Rivero, 1936 – valid – Cuban chimaera, chimaera, quimera
  Labrisomus nigricinctus Howell Rivero, 1936 – valid – spotcheek blenny, sapito lunado, trambollo lunado
  Scyliorhinus torrei Howell Rivero, 1936 – valid – dwarf catshark, dwarf cat shark, gatica prieta
  Squalus cubensis Howell Rivero, 1936 – valid – cazón aguijón cubano, Cuban dogfish, galludo cubano
  Squalus tasmaniensis Howell Rivero, 1936 – invalid
  Rhinolophus maendeleo Kock, Csorba and Howell, 2000 – valid – Maendeleo Horseshoe Bat
  Atheris matildae Menegon, Davenport and Howell, 2011 – valid – Matilda's Horned Viper
  Kinyongia msuyae Menegon, Loader, Davenport, Howell, Tilbury, Machaga and Tolley, 2015 – valid
  Kassina jozani Msuya, Howell and Channing, 2007 – valid
  Nectophrynoides asperginis Poynton, Howell, Clarke and Lovett, 1999 – valid
  Glaucidium parkeri Robbins & S. N. G. Howell, 1995 – valid – Subtropical Pygmy Owl
  Aimophila botterii spadiconigrescens T. R. Howell, 1965 – invalid
  Amazilia cyanocephala chlorostephana T. R. Howell, 1965 – invalid
  Falco sparverius nicaraguensis T. R. Howell, 1965 – valid
  Peucaea botterii spadiconigrescens (T. R. Howell, 1965) – valid
  Piranga flava savannarum T. R. Howell, 1965 – invalid
  Piranga hepatica savannarum T. R. Howell, 1965 – valid
  Pyrocephalus rubinus pinicola T. R. Howell, 1965 – valid
  Saucerottia cyanocephala chlorostephana (T. R. Howell, 1965) – valid
  Sialia sialis caribaea T. R. Howell, 1965 – valid
 
 Kingdom Chromista
  Alexandrium monilatum (Howell) F. J. R. Taylor, 1979 – accepted
 
 Kingdom Bacteria
  Actinomyces viscosus (Howell et al., 1965) Georg et al., 1969 – valid
 
 Kingdom Plantae
  Potentilla lycopodioides (A. Gray) Baill. ex J.T. Howell – not accepted
  Aster eatonii (A. Gray) Howell – not accepted – Eaton's aster
  Aster geyeri (A. Gray) Howell – not accepted
  Hypopitys fimbriata (A. Gray) Howell – not accepted
  Lepidium acutidens (A. Gray) Howell – accepted – alkali pepperwort
  Machaeranthera eradiata (A. Gray) Howell – not accepted
  Myosurus lepturus (A. Gray) Howell – not accepted
  Oreobroma nevadense (A. Gray) Howell – not accepted
  Oreobroma pygmaeum (A. Gray) Howell – not accepted
  Oxycoccus palustris var. intermedius (A. Gray) Howell – not accepted
  Viola occidentalis (A. Gray) Howell – not accepted
  Cirsium hydrophilum var. vaseyi (A. Gray) J.T. Howell – accepted – Vasey's thistle
  Lessingia germanorum var. glandulifera (A. Gray) J.T. Howell – not accepted
  Lessingia germanorum var. lemmonii (A. Gray) J.T. Howell – not accepted
  Lessingia germanorum var. tenuis (A. Gray) J.T. Howell – not accepted
  Phacelia cicutaria var. hispida (A. Gray) J.T. Howell – accepted – caterpillar phacelia
  Potentilla lindleyi var. sericea (A. Gray) J.T. Howell – not accepted
  Stylocline amphibola (A. Gray) J.T. Howell – not accepted
  Stylocline amphiloba (A. Gray) J.T. Howell – not accepted
  Achillea borealis var. arenicola (A. Heller) J.T. Howell – not accepted
  Lessingia germanorum var. ramulosissima (A. Nelson) J.T. Howell – not accepted
  Phacelia salima (A. Nelson) J.T. Howell – not accepted
  Phacelia salina (A. Nelson) J.T. Howell – accepted – alkaline phacelia, Bitter Creek phacelia
  Phacelia scopulina (A. Nelson) J.T. Howell – accepted – Debeque scorpion-weed, prostrate phacelia, Debeque phacelia
  Phacelia scopulina var. scopulina (A. Nelson) J.T. Howell – accepted – Debeque phacelia
  Potentilla osterhoutii (A. Nelson) J.T. Howell – not accepted
  Stanleya confertiflora (B.L. Rob.) Howell – accepted – Oregon princesplume
  Eleocharis quinqueflora var. suksdorfiana (Beauverd) J.T. Howell – not accepted
  Salix congesta (Bebb ex Rothr.) J.T. Howell – not accepted
  Pogogyne douglasii ssp. parviflora (Benth.) J.T. Howell – not accepted – Douglas' mesamint
  Alsine brachypetala (Bong.) Howell – not accepted
  Linanthus pygmaeus (Brand) J.T. Howell – not accepted – pygmy linanthus
  Linanthus pygmaeus ssp. pygmaeus (Brand) J.T. Howell – not accepted – pygmy linanthus
  Phacelia pulchella var. gooddingii (Brand) J.T. Howell – accepted – Goodding's phacelia
  Potentilla osterhoutii var. saxosa (Brandegee) J.T. Howell – not accepted
  Haplopappus peirsonii (D.D. Keck) J.T. Howell – not accepted
  Orthocarpus faucibarbatus var. albidus (D.D. Keck) J.T. Howell – not accepted
  Potentilla congesta var. nemorosa (D.D. Keck) J.T. Howell – not accepted
  Montia perfoliata (Donn ex Willd.) Howell – not accepted – miner's lettuce
  Montia parviflora (Douglas ex Hook.) Howell – not accepted
  Montia spathulata (Douglas) Howell – not accepted
  Montia spathulata var. spathulata (Douglas) Howell – not accepted
  Purpusia arizonica Eastw. ex J.T. Howell – not accepted
  Ivesia arizonica (Eastw. ex J.T. Howell) Ertter – accepted – rock-whitefeather, rock whitefeather
  Ivesia arizonica var. arizonica (Eastw. ex J.T. Howell) Ertter – accepted – Arizona whitefeather
  Convolvulus occidentalis ssp. saxicola (Eastw.) J.T. Howell – not accepted
  Convolvulus occidentalis var. saxicola (Eastw.) J.T. Howell – not accepted
  Lessingia nemaclada var. albiflora (Eastw.) J.T. Howell – not accepted – slenderstem lessingia
  Montia spathulata var. rosulata (Eastw.) J.T. Howell – not accepted
  Orthocarpus densiflorus var. noctuinus (Eastw.) J.T. Howell – not accepted
  Potentilla marinensis (Elmer) J.T. Howell – not accepted
  Phoradendron libocedri (Engelm.) Howell – not accepted – incense cedar mistletoe
  Montia gypsophiloides (Fisch. & C.A. Mey.) Howell – not accepted
  Camassia quamash var. linearis (Gould) J.T. Howell – not accepted
  Phacelia egena (Greene ex Brand) Greene ex J.T. Howell – accepted – Kaweah river scorpion-weed, Kaweah River phacelia
  Dentaria gemmata (Greene) Howell – not accepted
  Cirsium cymosum (Greene) J.T. Howell – accepted – peregrine thistle
  Cirsium cymosum var. cymosum (Greene) J.T. Howell – accepted – peregrine thistle
  Convolvulus occidentalis var. purpuratus (Greene) J.T. Howell – not accepted
  Erigeron linearis var. elegantulus (Greene) J.T. Howell – not accepted
  Eschscholzia frutescens (Greene) J.T. Howell – not accepted
  Lessingia germanorum var. parvula (Greene) J.T. Howell – not accepted
  Lessingia germanorum var. pectinata (Greene) J.T. Howell – not accepted
  Lessingia germanorum var. tomentosa (Greene) J.T. Howell – not accepted
  Lessingia hololeuca var. arachnoidea (Greene) J.T. Howell – not accepted
  Lessingia nemaclada var. mendocina (Greene) J.T. Howell – not accepted – Mendocino lessingia
  Lessingia ramulosa var. micradenia (Greene) J.T. Howell – not accepted
  Lessingia virgata var. glomerata (Greene) J.T. Howell – not accepted – wand lessingia
  Lupinus douglasii var. fallax (Greene) J.T. Howell – not accepted
  Microseris paludosa (Greene) J.T. Howell – accepted – marsh silverpuffs
  Rumex occidentalis var. procerus (Greene) J.T. Howell – not accepted
  Streptanthus fenestratus (Greene) J.T. Howell – accepted – Tehipite Valley jewelflower
  Galium angustifolium var. bernardinum Hilend & J.T. Howell – not accepted
  Galium angustifolium var. diffusum Hilend & J.T. Howell – not accepted
  Galium angustifolium var. foliosum Hilend & J.T. Howell – not accepted
  Galium angustifolium var. typicum Hilend & J.T. Howell – not accepted
  Galium californicum var. typicum Hilend & J.T. Howell – not accepted
  Galium jepsonii Hilend & J.T. Howell – accepted – Jepson's bedstraw
  Galium munzii Hilend & J.T. Howell – accepted – Munz's bedstraw
  Galium munzii ssp. munzii Hilend & J.T. Howell – accepted – Munz's bedstraw
  Galium munzii var. carneum Hilend & J.T. Howell – not accepted
  Galium munzii var. minzii Hilend & J.T. Howell – not accepted
  Galium munzii var. subalpinum Hilend & J.T. Howell – not accepted
  Galium parishii Hilend & J.T. Howell – accepted – Parish's bedstraw
  Galium stellatum var. eremicum Hilend & J.T. Howell – not accepted
  Galium multiflorum var. subalpinum (Hilend & J.T. Howell) Cronquist – not accepted
  Galium hilendiae ssp. carneum (Hilend & J.T. Howell) Dempster & Ehrend. – accepted – Panamint Mountains bedstraw, Hilend's bedstraw
  Galium angustifolium ssp. foliosum (Hilend & J.T. Howell) Dempster & Stebbins – accepted – narrowleaf bedstraw
  Galium hypotrichium ssp. subalpinum (Hilend & J.T. Howell) Ehrend. – accepted – subalpine bedstraw
  Galium stellatum ssp. eremicum (Hilend & J.T. Howell) Ehrend. – accepted – desert bedstraw, starry bedstraw
  Phacelia lutea (Hook. & Arn.) J.T. Howell – accepted – yellow phacelia
  Phacelia lutea var. lutea (Hook. & Arn.) J.T. Howell – accepted – yellow phacelia
  Aconitum bulbiferum Howell – not accepted
  Allium watsonii Howell – not accepted
  Allocarya bracteata Howell – not accepted
  Alsine simcoei Howell – not accepted
  Arabis koehleri Howell – not accepted – Koehler's rockcress
  Arabis koehleri var. koehleri Howell – not accepted – Koehler's rockcress
  Arabis secunda Howell – not accepted
  Arctostaphylos bracteata Howell – not accepted
  Arctostaphylos hispidula Howell – accepted – Gasquet manzanita
  Arctostaphylos intricata Howell – not accepted
  Arctostaphylos oblongifolia Howell – not accepted
  Arctostaphylos puchella Howell – not accepted
  Arctostaphylos pulchella Howell – not accepted
  Arctostaphylos strigosa Howell – not accepted
  Arenaria burkei Howell – not accepted
  Arnica cernua Howell – accepted – serpentine arnica
  Astragalus hoodianus Howell – accepted – Hood River milkvetch
  Astragalus salinus Howell – not accepted
  Campanula piperi Howell – accepted – Olympic bellflower, Olympic harebell
  Clematis brevifolia Howell – not accepted
  Crataegus columbiana Howell – not accepted – Columbia hawthorn
  Crataegus columbiana var. columbiana Howell – not accepted – Columbian hawthorn
  Delphinium oreganum Howell – not accepted
  Erigeron aliceae Howell – accepted – Alice Eastwood's fleabane
  Eriogonum ternatum Howell – accepted – ternate buckwheat
  Gentiana bisetaea Howell – not accepted
  Geranium oreganum Howell – accepted – Oregon geranium
  Hieracium longiberbe Howell – accepted – longbeard hawkweed
  Horkelia hendersonii Howell – accepted – Henderson's horkelia
  Iris chrysophylla Howell – accepted – yellowleaf iris
  Lathyrus lanceolatus Howell – not accepted
  Limnanthes floccosa Howell – accepted – woolly meadowfoam
  Limnanthes floccosa ssp. floccosa Howell – accepted – woolly meadowfoam
  Limnanthes gracilis Howell – not accepted – slender meadowfoam
  Limnanthes gracilis ssp. gracilis Howell – not accepted – slender meadowfoam
  Limnanthes pumila Howell – not accepted
  Lithophragma campanulatum Howell – accepted – Siskiyou Mountain woodland-star
  Lupinus canescens Howell – not accepted
  Lupinus mucronulatus Howell – not accepted
  Lupinus saxosus Howell – accepted – rock lupine, stone lupine
  Lupinus saxosus var. saxosus Howell – accepted – rock lupine, stonyground lupine
  Machaeranthera attenuata Howell – not accepted
  Mimulus grandiflorus Howell – not accepted
  Mimulus hirsutus Howell – not accepted
  Monardella purpurea Howell – accepted – serpentine monardella
  Penstemon cardwellii Howell – accepted – Cardwell's beardtongue
  Phacelia verna Howell – accepted – spring phacelia
  Pleuricospora longipetala Howell – not accepted
  Potentilla ciliata Howell – not accepted
  Potentilla pacifica Howell – not accepted
  Pyrola aphylla var. paucifolia Howell – not accepted
  Ribes acerifolium Howell – accepted – mapleleaf currant
  Sagittaria esculenta Howell – not accepted
  Saxifraga oregana Howell – not accepted – box saxifrage, Oregon saxifrage
  Sedum ciliosum Howell – not accepted
  Senecio adamsii Howell – not accepted
  Sidalcea virgata Howell – accepted – virgate checkerbloom, rose checkerbloom
  Steironema laevigatum Howell – not accepted – fringed loosestrife
  Tellima odorata Howell – not accepted
  Thermopsis gracilis Howell – accepted – slender goldenbanner
  Thermopsis gracilis var. gracilis Howell – not accepted – slender goldenbanner
  Thermopsis robusta Howell – accepted – showy goldenbanner
  Trifolium oreganum Howell – not accepted
  Vaccinium alaskaense Howell – not accepted
  Vaccinium alaskense Howell – not accepted
  Boechera koehleri (Howell) Al-Shehbaz – accepted – Koehler's rockcress
  Limnanthes floccosa ssp. pumila (Howell) Arroyo – accepted – dwarf meadowfoam, woolly meadowfoam
  Arabis arcuata var. secunda (Howell) B.L. Rob. – not accepted
  Astragalus lentiginosus var. salinus (Howell) Barneby – accepted – salty loco milkvetch
  Astragalus pulsiferae var. suksdorfii (Howell) Barneby – accepted – Suksdorf's milkvetch
  Lupinus polyphyllus var. saxosus (Howell) Barneby – not accepted
  Rhamnus californica ssp. occidentalis (Howell) C.B. Wolf – accepted – California buckthorn
  Betula glandulosa var. hallii (Howell) C.L. Hitchc. – not accepted
  Lathyrus nevadensis ssp. lanceolatus (Howell) C.L. Hitchc. – not accepted – Sierra pea
  Lathyrus nevadensis ssp. lanceolatus var. lanceolatus (Howell) C.L. Hitchc. – not accepted
  Sidalcea malviflora ssp. virgata (Howell) C.L. Hitchc. – not accepted
  Stellaria simcoei (Howell) C.L. Hitchc. – not accepted
  Lupinus leucophyllus ssp. leucophyllus var. canescens (Howell) C.P. Sm. – not accepted – velvet lupine
  Lupinus leucophyllus var. canescens (Howell) C.P. Sm. – accepted – velvet lupine
  Limnanthes floccosa var. pumila (Howell) C.T. Mason – not accepted
  Trifolium rusbyi ssp. oreganum (Howell) D. Heller & Zohary – not accepted
  Lupinus arbustus ssp. arbustus var. montanus (Howell) D.B. Dunn – not accepted – longspur lupine
  Lupinus arbustus var. montanus (Howell) D.B. Dunn – accepted – longspur lupine
  Penstemon whitedii ssp. dayanus (Howell) D.D. Keck – not accepted
  Dentaria tenella var. quercetorum (Howell) Detling – not accepted
  Sidalcea malviflora var. virgata (Howell) Dimling – not accepted
  Boechera holboellii var. secunda (Howell) Dorn – not accepted
  Lewisia columbiana (Howell ex A. Gray) B.L. Rob. – accepted – Columbian lewisia
  Lewisia columbiana var. columbiana (Howell ex A. Gray) B.L. Rob. – accepted – Columbian lewisia
  Arabis purpurascens Howell ex Greene – not accepted
  Lepidium nitidum var. oreganum (Howell ex Greene) C.L. Hitchc. – not accepted – shining pepperweed
  Crepis runcinata var. hispidulosa Howell ex Rydb. – not accepted
  Crepis runcinata ssp. hispidulosa (Howell ex Rydb.) Babc. & Stebbins – accepted – fiddleleaf hawksbeard
  Psilochenia runcinata ssp. hispidulosa (Howell ex Rydb.) W.A. Weber – not accepted
  Poa argentea Howell ex Vasey – not accepted
  Melica argentea (Howell ex Vasey) Beal – not accepted
  Stellaria borealis var. simcoei (Howell) Fernald – not accepted
  Stellaria calycantha var. simcoei (Howell) Fernald – not accepted
  Sedum radiatum var. ciliosum (Howell) H. Ohba – accepted – Coast Range stonecrop
  Viola trinervata (Howell) Howell ex A. Gray – accepted – Rainier violet
  Plagiobothrys bracteatus (Howell) I.M. Johnst. – accepted – bracted popcornflower
  Plagiobothrys bracteatus var. bracteatus (Howell) I.M. Johnst. – accepted – bracted popcornflower
  Trifolium longipes var. oreganum (Howell) Isely – not accepted
  Arctostaphylos stanfordiana ssp. hispidula (Howell) J.E. Adams – not accepted
  Lomatium gormanii (Howell) J.M. Coult. & Rose – accepted – Gorman's biscuitroot
  Trifolium longipes ssp. oreganum (Howell) J.M. Gillett – accepted – Oregon clover
  Arabis holboellii var. secunda (Howell) Jeps. – not accepted
  Erigeron foliosus var. confinis (Howell) Jeps. – accepted – leafy fleabane
  Eriophyllum lanatum var. lanceolatum (Howell) Jeps. – accepted – common woolly sunflower
  Rhamnus californica var. occidentalis (Howell) Jeps. – not accepted
  Frangula californica ssp. occidentalis (Howell) Kartesz & Gandhi – not accepted – California buckthorn
  Potentilla egedii ssp. pacifica (Howell) L.A. Sergienko – not accepted
  Epilobium paniculatum var. hammondii (Howell) M. Peck – not accepted
  Lithophragma heterophyllum var. campanulatum (Howell) M. Peck – not accepted
  Aster attenuatus (Howell) M. Peck non Lindl. ex Hook. – not accepted
  Trifolium eriocephalum var. harneyense (Howell) McDermott – not accepted
  Limnanthes alba ssp. gracilis (Howell) Morin – accepted – slender meadowfoam
  Arctostaphylos intricata var. oblongifolia (Howell) Munz – not accepted
  Arctostaphylos viscida ssp. pulchella (Howell) P.V. Wells – accepted – sticky whiteleaf manzanita, serpentine manzanita
  Collinsia rattanii ssp. glandulosa (Howell) Pennell – accepted – sticky blue eyed Mary
  Cordylanthus viscidus (Howell) Pennell ex M. Peck – not accepted
  Arctostaphylos X cinerea Howell (pro sp.) – accepted – Waldo manzanita
  Arctostaphylos X parvifolia Howell (pro sp.) – accepted – gravel manzanita
  Heuchera X cuneata Howell (pro. sp.) – accepted – alumroot
  Iris tenax ssp. chrysophylla (Howell) Q.D. Clarkson – not accepted
  Sedum douglasii ssp. ciliosum (Howell) R.T. Clausen – not accepted
  Sedum radiatum ssp. ciliosum (Howell) R.T. Clausen – not accepted – Coast Range stonecrop
  Sedum stenopetalum ssp. ciliosum (Howell) R.T. Clausen – not accepted
  Arctostaphylos pungens ssp. hispidula (Howell) Roof – not accepted
  Potentilla anserina ssp. pacifica (Howell) Rousi – accepted – Pacific silverweed
  Micranthes oregana (Howell) Small – accepted – bog saxifrage, Oregon saxifrage
  Cordylanthus tenuis ssp. viscidus (Howell) T.I. Chuang & Heckard – accepted – slender bird's beak
  Claytonia rubra (Howell) Tidestr. – accepted – red-stem springbeauty, redstem springbeauty
  Claytonia rubra ssp. rubra (Howell) Tidestr. – accepted – redstem springbeauty
  Haplopappus ophitidus (J. T. Howell) D.D. Keck – not accepted
  Phacelia cicutaria var. heliophila (J.F. Macbr.) J.T. Howell – not accepted
  Phacelia cicutaria var. hubbyi (J.F. Macbr.) J.T. Howell – accepted – caterpillar phacelia
  Phacelia inyoensis (J.F. Macbr.) J.T. Howell – accepted – Inyo phacelia
  Agrostis longiligula var. australis J.T. Howell – not accepted – longtongue bentgrass
  Arctostaphylos edmundsii J.T. Howell – accepted – Little Sur manzanita
  Arctostaphylos glauca var. puberula J.T. Howell – not accepted
  Baeria bakeri J.T. Howell – not accepted
  Baeria macrantha var. thalassophila J.T. Howell – not accepted
  Blennosperma nanum var. robustum J.T. Howell – accepted – common stickyseed
  Calamagrostis purpurascens var. ophitidis J.T. Howell – not accepted
  Calyptridium parryi var. arizonicum J.T. Howell – not accepted
  Calyptridium parryi var. nevadense J.T. Howell – not accepted
  Campanula angustiflora var. exilis J.T. Howell – not accepted
  Carex jepsonii J.T. Howell – not accepted
  Carex specuicola J.T. Howell – accepted – Navajo sedge
  Carex tompkinsii J.T. Howell – accepted – Thompkins' sedge
  Castilleja leschkeana J.T. Howell – not accepted – Point Reyes paintbrush
  Ceanothus confusus J.T. Howell – accepted – Rincon Ridge ceanothus, Rincon ceanothus
  Ceanothus cuneatus var. dubius J.T. Howell – not accepted
  Ceanothus gloriosus J.T. Howell – accepted – Point Reyes ceanothus
  Ceanothus gloriosus ssp. gloriosus J.T. Howell – not accepted – Point Reyes creeper
  Ceanothus gloriosus var. exaltatus J.T. Howell – accepted – Point Reyes ceanothus
  Ceanothus gloriosus var. gloriosus J.T. Howell – accepted – Point Reyes ceanothus
  Ceanothus gloriosus var. porrectus J.T. Howell – accepted – Mount Vision ceanothus, Mt. Vision ceanothus
  Ceanothus jepsonii var. albiflorus J.T. Howell – accepted – Jepson ceanothus
  Ceanothus sonomensis J.T. Howell – accepted – Sonoma ceanothus
  Chorizanthe thurberi var. macrotheca J.T. Howell – not accepted
  Cirsium fontinale var. obispoense J.T. Howell – accepted – Chorro Creek bog thistle
  Cirsium pastoris J.T. Howell – not accepted – snowy thistle
  Cirsium proteanum J.T. Howell – not accepted
  Cordylanthus nidularius J.T. Howell – accepted – Mount Diablo bird's-beak
  Cryptantha circumscissa var. rosulata J.T. Howell – accepted – cushion cryptantha
  Eriogonum ampullaceum J.T. Howell – accepted – Mono buckwheat
  Eriogonum apricum J.T. Howell – accepted – Ione buckwheat
  Eriogonum apricum var. apricum J.T. Howell – accepted – Ione buckwheat
  Eriogonum argillosum J.T. Howell – accepted – clay buckwheat
  Eriogonum breedlovei var. shevockii J.T. Howell – accepted – Needle's buckwheat, The Needles buckwheat
  Eriogonum butterworthianum J.T. Howell – accepted – Butterworth's buckwheat
  Eriogonum eastwoodianum J.T. Howell – accepted – Eastwood's buckwheat
  Eriogonum esmeraldense var. toiyabense J.T. Howell – accepted – Toiyabe buckwheat
  Eriogonum glandulosum var. carneum J.T. Howell – not accepted
  Eriogonum ochrocephalum var. breedlovei J.T. Howell – not accepted
  Eriogonum ripleyi J.T. Howell – accepted – Fraziers Well buckwheat, Ripley wild-buckwheat
  Eriogonum vestitum J.T. Howell – accepted – Idria buckwheat
  Eriogonum viscidulum J.T. Howell – accepted – clammy buckwheat, sticky buckwheat
  Eriogonum zionis J.T. Howell – accepted – Zion wild buckwheat, Zion buckwheat
  Eriogonum zionis var. coccineum J.T. Howell – accepted – Zion buckwheat
  Eriogonum zionis var. zionis J.T. Howell – accepted – Zion buckwheat
  Eriophyllum lanatum var. aphanactis J.T. Howell – not accepted – common woolly sunflower
  Euphorbia bisulcata J.T. Howell – not accepted
  Euphorbia guadalupensis J.T. Howell – not accepted
  Euphorbia ocellata var. kirbyi J.T. Howell – not accepted
  Euphorbia patellifera J.T. Howell – not accepted
  Euphorbia pseudoserpyllifolia f. typica J.T. Howell – not accepted
  Euphorbia pseudoserpyllifolia f. villosa J.T. Howell – not accepted
  Galium collomae J.T. Howell – not accepted
  Galium collomiae J.T. Howell – accepted – Fossil Hill Creek bedstraw
  Hackelia amethystima J.T. Howell – not accepted
  Hackelia amethystina J.T. Howell – accepted – amethyst stickseed
  Haplopappus bloomeri var. ophitidis J.T. Howell – not accepted
  Lessingia germanorum var. peirsonii J.T. Howell – not accepted
  Lewisia cantelovii J.T. Howell – accepted – Cantelow's lewisia
  Lewisia cantelowii J.T. Howell – not accepted – Cantelon's lewisia
  Limnanthes bakeri J.T. Howell – accepted – Baker's meadowfoam
  Melica geyeri var. aristulata J.T. Howell – accepted – Geyer's oniongrass
  Mimulus cleistogamus J.T. Howell – accepted – selfing monkeyflower
  Nama retrorsa J.T. Howell – accepted – betatakin fiddleleaf
  Nama retrorsum J.T. Howell – not accepted – betatakin fiddleleaf
  Navarretia nigelliformis var. radians J.T. Howell – not accepted
  Nemacladus twisselmannii J.T. Howell – accepted – Twisselmann's threadplant, Twisselmann's nemacladus
  Opuntia echios J.T. Howell – not accepted
  Opuntia megasperma J.T. Howell – not accepted
  Opuntia saxicola J.T. Howell – not accepted
  Penstemon papillatus J.T. Howell – accepted – Inyo beardtongue, Inyo penstemon
  Phacelia adenophora J.T. Howell – accepted – glandbearing phacelia, glandular yellow phacelia
  Phacelia affinis var. patens J.T. Howell – not accepted
  Phacelia austromontana J.T. Howell – accepted – southern mountain phacelia, Southern Sierra phacelia
  Phacelia barnebyana J.T. Howell – accepted – Barneby's phacelia
  Phacelia ciliata var. opaca J.T. Howell – accepted – Great Valley phacelia, Merced phacelia
  Phacelia dalesiana J.T. Howell – accepted – Scott Mountain phacelia, Trinity phacelia
  Phacelia demissa var. heterotricha J.T. Howell – not accepted
  Phacelia demissa var. typica J.T. Howell – not accepted
  Phacelia eisenii var. brandegeeana J.T. Howell – not accepted
  Phacelia greenei J.T. Howell – accepted – Scott Valley phacelia
  Phacelia humilis var. dudleyi J.T. Howell – accepted – Dudley's phacelia
  Phacelia indecora J.T. Howell – accepted – drab phacelia
  Phacelia insularis var. continentis J.T. Howell – accepted – North Coast phacelia, northcoast phacelia
  Phacelia inundata J.T. Howell – accepted – playa phacelia, playa yellow phacelia
  Phacelia ivesiana var. pediculoides J.T. Howell – accepted – Ives' phacelia, lousewort scorpion-weed, louse phacelia
  Phacelia ivesiana var. typica J.T. Howell – not accepted
  Phacelia laxiflora J.T. Howell – accepted – dozing scorpion-weed, nodding phacelia, dozing phacelia
  Phacelia leonis J.T. Howell – accepted – Siskiyou phacelia
  Phacelia lutea var. purpurascens J.T. Howell – not accepted
  Phacelia nevadensis J.T. Howell – not accepted
  Phacelia peckii J.T. Howell – accepted – Peck's phacelia
  Phacelia peirsoniana J.T. Howell – accepted – trail phacelia, handsome phacelia
  Phacelia pulchella var. sabulonum J.T. Howell – accepted – beautiful phacelia
  Phacelia pulchella var. typica J.T. Howell – not accepted
  Phacelia quickii J.T. Howell – accepted – Quick's phacelia
  Phacelia submutica J.T. Howell – not accepted – DeBeque phacelia
  Phacelia tetramera J.T. Howell – accepted – fourpart phacelia
  Physocarpus alternans ssp. annulatus J.T. Howell – not accepted – dwarf ninebark
  Physocarpus alternans ssp. panamintensis J.T. Howell – not accepted – dwarf ninebark
  Pityrogramma semipallida J.T. Howell – not accepted
  Pityrogramma triangularis var. semipallida J.T. Howell – not accepted
  Plagiobothrys uncinatus J.T. Howell – accepted – Salinas Valley popcornflower
  Poa sierrae J.T. Howell – accepted – Sierra bluegrass
  Pogogyne abramsii J.T. Howell – accepted – San Diego pogogyne, San Diego mesamint
  Pogogyne clareana J.T. Howell – accepted – Santa Lucia pogogyne, Santa Lucia mint
  Pogogyne douglasii ssp. minor J.T. Howell – not accepted – Douglas' mesamint
  Potentilla aperta J.T. Howell – not accepted
  Potentilla patellifera J.T. Howell – not accepted
  Potentilla tularensis J.T. Howell – not accepted
  Senecio foetidus J.T. Howell – not accepted
  Senecio lewisrosei J.T. Howell – not accepted
  Streptanthella longirostris var. derelicta J.T. Howell – not accepted
  Streptanthus amplexicaulis var. barbarae J.T. Howell – not accepted
  Streptanthus cordatus var. piutensis J.T. Howell – accepted – heartleaf twistflower, Piute Mountains jewelflower
  Streptanthus farnsworthianus J.T. Howell – accepted – Farnsworth's jewelflower, Evalyn's jewelflower
  Thermopsis macrophylla var. agnina J.T. Howell – not accepted – Santa Barbara false-lupine
  Eriogonum hirtellum J.T. Howell & Bacig. – accepted – Klamath Mountain buckwheat, Klamath Mountain wild buckwheat
  Sidalcea stipularis J.T. Howell & G.H. True – accepted – Scadden Flat checkermallow, Scadden Flat checkerbloom
  Eriogonum eremicola J.T. Howell & Reveal – accepted – Telescope Peak buckwheat, Wild Rose Canyon buckwheat
  Eriogonum temblorense J.T. Howell & Twisselm. – accepted – Temblor buckwheat
  Navarretia nigelliformis ssp. radians (J.T. Howell) A.G. Day – accepted – adobe navarretia
  Ceanothus divergens ssp. confusus (J.T. Howell) Abrams – not accepted
  Ceanothus cuneatus ssp. sonomensis (J.T. Howell) C.L. Schmidt – not accepted – Sonoma ceanothus
  Ceanothus gloriosus ssp. exaltatus (J.T. Howell) C.L. Schmidt – not accepted – Point Reyes ceanothus
  Ceanothus gloriosus ssp. porrectus (J.T. Howell) C.L. Schmidt – not accepted – Point Reyes creeper
  Ceanothus jepsonii ssp. albiflorus (J.T. Howell) C.L. Schmidt – not accepted – Jepson ceanothus
  Ceanothus prostratus ssp. confusus (J.T. Howell) C.L. Schmidt – not accepted – squawcarpet
  Phacelia pediculoides (J.T. Howell) Constance – not accepted
  Phacelia lutea var. submutica (J.T. Howell) Cronquist – not accepted
  Phacelia perityloides var. laxiflora (J.T. Howell) Cronquist – not accepted
  Baeria macrantha var. bakeri (J.T. Howell) D.D. Keck – not accepted
  Grindelia robusta var. bracteosa (J.T. Howell) D.D. Keck – not accepted
  Haplopappus ophitidis (J.T. Howell) D.D. Keck – not accepted
  Haplopappus whitneyi ssp. discoideus (J.T. Howell) D.D. Keck – not accepted
  Ivesia patellifera (J.T. Howell) Ertter – accepted – Kingston Mountain mousetail, Kingston Mountains cinquefoil
  Eriogonum parvifolium ssp. lucidum J.T. Howell ex S. Stokes – not accepted
  Eriogonum parvifolium var. lucidum (J.T. Howell ex S. Stokes) Reveal – not accepted – Point Lobos wild buckwheat
  Lessingia lemmonii var. peirsonii (J.T. Howell) Ferris – not accepted – Peirson's lessingia
  Ericameria ophitidis (J.T. Howell) G.L. Nesom – accepted – serpentine goldenbush
  Centrostegia thurberi var. macrotheca (J.T. Howell) Goodman – not accepted
  Phacelia scopulina var. submutica (J.T. Howell) Halse – accepted – Debeque phacelia
  Packera eurycephala var. lewisrosei (J.T. Howell) J.F. Bain – accepted – Lewis' groundsel
  Potentilla hendersonii (J.T. Howell) J.T. Howell – not accepted
  Cistanthe parryi var. arizonica (J.T. Howell) Kartesz & Gandhi – not accepted – Arizona pussypaws
  Cistanthe parryi var. nevadensis (J.T. Howell) Kartesz & Gandhi – not accepted – Nevada pussypaws
  Grindelia camporum var. bracteosa (J.T. Howell) M.A. Lane – not accepted – bract gumweed
  Lessingia glandulifera var. peirsonii (J.T. Howell) Markos – accepted – Peirson's lessingia
  Lessingia pectinata var. tenuipes (J.T. Howell) Markos – accepted
  Cryptantha circumscissa ssp. rosulata (J.T. Howell) Mathew & P.H. Raven – not accepted
  Calyptridium parryi ssp. nevadense (J.T. Howell) Munz – not accepted
  Caulanthus amplexicaulis var. barbarae (J.T. Howell) Munz – not accepted – claspingleaf wild cabbage, Santa Barbara jewelflower
  Horkelia tularensis (J.T. Howell) Munz – accepted – Kern Plateau horkelia, Tulare horkelia
  Ivesia aperta (J.T. Howell) Munz – accepted – Sierra Valley ivesia, Sierra Valley mousetail
  Ivesia aperta var. aperta (J.T. Howell) Munz – accepted – Sierra Valley ivesia, Sierra Valley mousetail
  Phacelia divaricata var. continentis (J.T. Howell) Munz – not accepted
  Calamagrostis ophitidis (J.T. Howell) Nygren – accepted – serpentine reedgrass
  Lasthenia macrantha ssp. bakeri (J.T. Howell) Ornduff – not accepted – Baker's goldfields
  Arctostaphylos X repens (J.T. Howell) P.V. Wells – accepted – PMC manzanita
  Lasthenia californica ssp. bakeri (J.T. Howell) R. Chan – accepted – Baker's goldfields
  Eriogonum breedlovei (J.T. Howell) Reveal – accepted – Paiute buckwheat, Piute buckwheat
  Eriogonum breedlovei var. breedlovei (J.T. Howell) Reveal – accepted – Paiute buckwheat, Piute buckwheat
  Eriogonum carneum (J.T. Howell) Reveal – not accepted
  Eriogonum twisselmannii (J.T. Howell) Reveal – accepted – Twisselmann's buckwheat
  Eriogonum wrightii var. olanchense (J.T. Howell) Reveal – accepted – Olancha Peak buckwheat
  Arctostaphylos uva-ursi ssp. emundsii (J.T. Howell) Roof – not accepted
  Eriogonum mohavense ssp. ampullaceum (J.T. Howell) S. Stokes – not accepted
  Eriogonum racemosum var. coccineum (J.T. Howell) S.L. Welsh – not accepted
  Eriogonum racemosum var. zionis (J.T. Howell) S.L. Welsh – not accepted
  Senecio eurycephalus var. lewisrosei (J.T. Howell) T.M. Barkley – not accepted – Lewis' groundsel
  Erysimum capitatum var. stellatum (J.T. Howell) Twisselm. – not accepted
  Hazardia whitneyi var. discoidea (J.T. Howell) W.D. Clark – accepted – Whitney's bristleweed
  Pentagramma triangularis ssp. semipallida (J.T. Howell) Yatsk., Windham & E. Wollenw. – accepted – goldback fern
  Convolvulus occidentalis var. solanensis (Jeps.) J.T. Howell – not accepted
  Pleuropogon hooveranus (L. Bensen) J. T. Howell – not accepted
  Montia sibirica (L.) Howell – not accepted
  Pleuropogon hooverianus (L.D. Benson) J.T. Howell – accepted – North Coast semaphoregrass
  Montia arenicola (L.F. Hend.) Howell – not accepted
  Salix fluviatilis var. tenerrima (L.F. Hend.) Howell – not accepted
  Cirsium ciliolatum (L.F. Hend.) J.T. Howell – accepted – Ashland thistle
  Rubus ursinus ssp. ursinus var. sirbenus (L.H. Bailey) J.T. Howell – not accepted – California blackberry
  Rubus ursinus var. sirbenus (L.H. Bailey) J.T. Howell – not accepted – California blackberry
  Ambrosia chamissonis var. bipinnatisecta (Less.) J.T. Howell – not accepted
  Trisetum spicatum var. projectum (Louis-Marie) J.T. Howell – not accepted
  Eriogonum spergulinum var. reddingianum (M.E. Jones) J.T. Howell – accepted – Redding buckwheat
  Physocarpus alternans (M.E. Jones) J.T. Howell – accepted – dwarf ninebark
  Physocarpus alternans ssp. alternans (M.E. Jones) J.T. Howell – not accepted – dwarf ninebark
  Triglochin concinna var. debilis (M.E. Jones) J.T. Howell – not accepted
  Triglochin concinnum var. debile (M.E. Jones) J.T. Howell – not accepted
  Stenogonum flexum (M.E. Jones) Reveal & J.T. Howell – accepted – bent twowhorl buckwheat, bent two-whorl buckwheat
  Viola purpurea var. integrifolia (M.S. Baker & J.C. Clausen) J.T. Howell – accepted – goosefoot violet
  Viola purpurea var. mohavensis (M.S. Baker & J.C. Clausen) J.T. Howell – accepted – goosefoot violet
  Erodium obtusiplicatum (Maire, Weiller & Wilczek) J.T. Howell – not accepted
  Euphorbia vallis-mortae (Millsp.) J.T. Howell – accepted – Death Valley sandmat
  Phacelia suaveolens var. keckii (Munz & I.M. Johnst.) J.T. Howell – not accepted
  Erythronium grandiflorum ssp. pusaterii Munz & J.T. Howell – not accepted – Kaweah fawn lily
  Erythronium pusaterii (Munz & J.T. Howell) Shevock, Bartel & G.A. Allen – accepted – Kaweah Lakes fawnlily
  Potentilla douglasii var. parviflora (Nutt. ex Hook. & Arn.) J.T. Howell – not accepted – pinewoods horkelia
  Fragaria cuneifolia Nutt. ex Howell – not accepted
  Fragaria X ananassa var. cuneifolia (Nutt. ex Howell) Staudt – not accepted – hybrid strawberry
  Fragaria X ananassa ssp. cuneifolia (Nutt. ex Howell) Staudt (pro nm.) – accepted
  Mitellastra caulescens (Nutt.) Howell – not accepted
  Montia dichotoma (Nutt.) Howell – accepted – dwarf minerslettuce
  Cirsium callilepis var. oregonense (Petr.) J.T. Howell – not accepted
  Cirsium callilepis var. pseudocarlinoides (Petr.) J.T. Howell – not accepted
  Cirsium douglasii var. canescens (Petr.) J.T. Howell – not accepted
  Penstemon rupicola (Piper) Howell – accepted – cliff beardtongue
  Achillea borealis var. californica (Pollard) J.T. Howell – not accepted
  Calochortus superbus Purdy ex J.T. Howell – accepted – yellow mariposa
  Ceratoides lanata (Pursh) J.T. Howell – not accepted
  Rumex salicifolius var. crassus (Rech. f.) J.T. Howell – not accepted – willow dock
  Dedeckera Reveal & J.T. Howell – accepted – Mary's grass, July gold
  Dedeckera eurekensis Reveal & J.T. Howell – accepted – July gold
  Lomatium minus (Rose ex Howell) Mathias & Constance – accepted – Day Valley desertparsley, Day Valley desert-parsley
  Horkelia caruifolia Rydb. ex Howell – not accepted
  Horkelia pseudocapitata Rydb. ex Howell – not accepted
  Potentilla caruifolia (Rydb. ex Howell) Crum – not accepted
  Horkelia fusca ssp. pseudocapitata (Rydb. ex Howell) D.D. Keck – not accepted – littlehead horkelia
  Horkelia daucifolia var. caruifolia (Rydb. ex Howell) Ertter & Reveal – accepted – carrotleaf horkelia
  Ivesia gordonii var. alpicola (Rydb. ex Howell) Ertter & Reveal – accepted – Gordon's ivesia
  Potentilla douglasii var. pseudocapitata (Rydb. ex Howell) Jeps. – not accepted – pinewoods horkelia
  Horkelia fusca var. pseudocapitata (Rydb. ex Howell) M. Peck – accepted
  Horkelia gordonii var. alpicola (Rydb. ex Howell) Rydb. – not accepted
  Ceratoides lanata var. subspinosa (Rydb.) J.T. Howell – not accepted
  Festuca ovina var. minutiflora (Rydb.) J.T. Howell – not accepted
  Potentilla lindleyi var. puberula (Rydb.) J.T. Howell – not accepted
  Potentilla lycopodioides var. megalopetala (Rydb.) J.T. Howell – not accepted
  Potentilla lycopodioides var. scandularis (Rydb.) J.T. Howell – not accepted
  Potentilla sericoleuca (Rydb.) J.T. Howell – not accepted
  Potentilla tilingii var. flavescens (Rydb.) J.T. Howell – not accepted
  Potentilla tweedyi (Rydb.) J.T. Howell – not accepted
  Rubus spectabilis var. franciscanus (Rydb.) J.T. Howell – not accepted – salmonberry
  Rubus ursinus var. eastwoodianus (Rydb.) J.T. Howell – not accepted
  Eriogonum nudum var. westonii (S. Stokes) J.T. Howell – accepted – Weston's buckwheat
  Eriogonum spergulinum var. pratense (S. Stokes) J.T. Howell – accepted – spurry buckwheat
  Eriogonum ternatum var. congdonii (S. Stokes) J.T. Howell – not accepted
  Calandrinia ambigua (S. Watson) Howell – not accepted
  Cardamine occidentalis (S. Watson) Howell – accepted – big western bittercress
  Filipendula occidentalis (S. Watson) Howell – accepted – queen of the forest, queen-of-the-forest
  Rorippa columbiae (S. Watson) Howell – accepted – Columbian yellowcress, Columbia watercress
  Chenopodium macrospermum var. farinosum (S. Watson) J.T. Howell – not accepted – largeseed goosefoot
  Eriogonum ochrocephalum var. gracilipes (S. Watson) J.T. Howell – not accepted
  Juncus bufonius var. cogdonii (S. Watson) J.T. Howell – not accepted
  Juncus bufonius var. congdonii (S. Watson) J.T. Howell – not accepted
  Potentilla baileyi var. setosa (S. Watson) J.T. Howell – not accepted
  Poa canbyi (Scribn.) Howell – not accepted
  Poa candyi (Scribn.) T. Howell – not accepted
  Chenopodium ambrosioides var. vagans (Standl.) J.T. Howell – not accepted
  Eriogonum ovalifolium var. eximium (Tidestr.) J.T. Howell – accepted – brownmargin buckwheat, cushion buckwheat
  Marah oregana (Torr. & A. Gray) Howell – accepted – western wildcucumber, coastal manroot
  Marah oreganus (Torr. & A. Gray) Howell – not accepted – coastal manroot, western wildcucumber
  Astragalus nuttallii (Torr. & A. Gray) J.T. Howell – accepted – Nuttall's milkvetch
  Astragalus nuttallii var. nuttallii (Torr. & A. Gray) J.T. Howell – accepted – Nuttall's milkvetch
  Potentilla egedii var. grandis (Torr. & A. Gray) J.T. Howell – not accepted
  Phacelia glaberrima (Torr. ex S. Watson) J.T. Howell – accepted – Reese River phacelia, southwestern phacelia
  Monardella sheltonii (Torr.) Howell – accepted – Shelton's monardella
  Trillium chloropetalum (Torr.) Howell – accepted – giant wakerobin
  Trillium chloropetalum var. chloropetalum (Torr.) Howell – accepted – giant wakerobin
  Quercus agrifolia var. oxyadenia (Torr.) J.T. Howell – not accepted – coastal live oak
  Galium angustifolium var. siccatum (W. Wight) Hilend & J.T. Howell – not accepted
  Sophia pinnata (Walter) Howell – not accepted
   

A gray bar