Integrated Taxonomic Information System - Search Results

Results of: Search in every Kingdom for Taxon Author(s) Name(s) S. Watson OR S Watson 'S. Watson'
 
 Kingdom Plantae
  Abronia nana S. Watson – accepted – dwarf sand verbena
  Abronia nana var. nana S. Watson – accepted – dwarf sand verbena
  Abronia villosa S. Watson – accepted – desert sand verbena
  Abronia villosa var. villosa S. Watson – accepted – desert sand verbena, woolly desert sand verbena
  Abutilon malacum S. Watson – accepted – yellow Indian mallow
  Abutilon newberryi S. Watson – not accepted
  Abutilon parishii S. Watson – accepted – Parish's Indian mallow
  Abutilon reventum S. Watson – accepted – yellowflower Indian mallow
  Acacia millefolia S. Watson – not accepted – milfoil wattle, Santa Rita acacia
  Acalypha pringlei S. Watson – not accepted
  Acnida floridana S. Watson – not accepted
  Adenostoma fasciculatum var. obtusifolium S. Watson – accepted – chamise
  Adolphia californica S. Watson – accepted – California adolphia, California prickbush
  Allium atrorubens S. Watson – accepted – dark red onion, red onion, darkred onion
  Allium atrorubens var. atrorubens S. Watson – accepted – darkred onion
  Allium bidwelliae S. Watson – not accepted
  Allium bigelovii S. Watson – accepted – Bigelow onion, Bigelow's onion
  Allium bisceptrum S. Watson – accepted – aspen onion, twincrest onion
  Allium bisceptrum var. bisceptrum S. Watson – not accepted – twincrest onion
  Allium bolanderi S. Watson – accepted – Bolander's onion
  Allium bolanderi var. bolanderi S. Watson – accepted – Bolander's onion
  Allium brandegeei S. Watson – accepted – Brandegee's onion
  Allium brevistylum S. Watson – accepted – shortstyle onion
  Allium breweri S. Watson – not accepted
  Allium campanulatum S. Watson – accepted – Sierra onion, dusky onion
  Allium cristatum S. Watson – not accepted
  Allium cusickii S. Watson – not accepted
  Allium fimbriatum S. Watson – accepted – fringed onion
  Allium fimbriatum var. fimbriatum S. Watson – accepted – fringed onion
  Allium geyeri S. Watson – accepted – Geyer onion, Geyer's onion
  Allium geyeri var. geyeri S. Watson – accepted – Geyer's onion, Geyer onion
  Allium haematochiton S. Watson – accepted – redskin onion
  Allium lacunosum S. Watson – accepted – pitted onion
  Allium lacunosum var. lacunosum S. Watson – accepted – pitted onion
  Allium lemmonii S. Watson – accepted – Lemmon onion, Lemmon's onion
  Allium macrum S. Watson – accepted – rock onion
  Allium madidum S. Watson – accepted – swamp onion
  Allium nevadense S. Watson – accepted – Nevada onion
  Allium nevadense var. nevadense S. Watson – not accepted – Nevada onion
  Allium nevii S. Watson – accepted – Nevius' garlic
  Allium nuttallii S. Watson – not accepted
  Allium palmeri S. Watson – not accepted
  Allium parishii S. Watson – accepted – Parish's onion
  Allium parryi S. Watson – accepted – Parry's fringed onion
  Allium platycaule S. Watson – accepted – broadstem onion, broadstemmed onion
  Allium pleianthum S. Watson – not accepted – manyflower onion
  Allium plummerae S. Watson – accepted – Tanners Canyon onion
  Allium serratum S. Watson – not accepted – pompom onion
  Allium tribracteatum var. andersoni S. Watson – not accepted
  Allium tribracteatum var. andersonii S. Watson – not accepted
  Allium validum S. Watson – accepted – swamp onion, Pacific onion
  Alnus incana var. virescens S. Watson – not accepted
  Amaranthus blitoides S. Watson – accepted – prostrate pigweed, prostrate amaranth, mat amaranth
  Amaranthus chihuahuensis S. Watson – accepted – Chihuahuan amaranth
  Amaranthus greggii S. Watson – accepted – Gregg's amaranth
  Amaranthus leucocarpus S. Watson – not accepted
  Amaranthus palmeri S. Watson – accepted – Palmer's amaranth, carelessweed
  Amaranthus powellii S. Watson – accepted – Powell's pigweed, Powell's amaranth
  Amaranthus powellii ssp. powellii S. Watson – not accepted – Powell's amaranth
  Amaranthus pringlei S. Watson – not accepted – Pringle's amaranth
  Amaranthus venulosus S. Watson – not accepted – fringed amaranth
  Amaranthus wrightii S. Watson – accepted – Wright's amaranth
  Amyris madrensis S. Watson – accepted – mountain torchwood
  Androstephium breviflorum S. Watson – accepted – pink funnellily, smallflower androstephium, pink funnel lily
  Anemone drummondii S. Watson – accepted – Drummond's anemone
  Anemone drummondii ssp. drummondii S. Watson – not accepted – Drummond's anemone
  Anemone drummondii var. drummondii S. Watson – accepted – Drummond's anemone
  Anemone occidentalis S. Watson – accepted – white pasqueflower
  Angelica dawsonii S. Watson – accepted – Dawson's angelica
  Angelica lyallii S. Watson – not accepted
  Angelica pinnata S. Watson – accepted – smallleaf angelica, small-leaf angelica
  Angelica tomentosa S. Watson – accepted – woolly angelica
  Angelica tomentosa var. tomentosa S. Watson – not accepted – woolly angelica
  Angelica wheeleri S. Watson – accepted – Utah angelica
  Anoda reticulata S. Watson – accepted – netted anoda
  Antigonon flavescens S. Watson – accepted – lovechain
  Antirrhinum kingii S. Watson – not accepted
  Aphyllon dugesii S. Watson – not accepted
  Aquilegia flavescens S. Watson – accepted – yellow columbine
  Aquilegia flavescens var. flavescens S. Watson – not accepted – yellow columbine
  Arabis arcuata var. subvillosa S. Watson – not accepted
  Arabis beckwithii S. Watson – not accepted – Beckwith's rockcress
  Arabis bolanderi S. Watson – not accepted
  Arabis breweri S. Watson – not accepted – Brewer's rockcress
  Arabis breweri var. breweri S. Watson – not accepted – Brewer's rockcress
  Arabis confinis S. Watson – not accepted
  Arabis cusickii S. Watson – not accepted – Cusick's rockcress
  Arabis furcata S. Watson – accepted – Columbia Gorge rockcress
  Arabis furcata var. furcata S. Watson – not accepted – Columbia Gorge rockcress
  Arabis holboellii var. fendleri S. Watson – not accepted
  Arabis howellii S. Watson – not accepted
  Arabis lemmonii S. Watson – not accepted – Lemmon rockcress, Lemmon's rockcress
  Arabis lemmonii var. lemmonii S. Watson – not accepted – Lemmon's rockcress
  Arabis lyallii S. Watson – not accepted – Lyall's rockcress
  Arabis lyallii var. lyallii S. Watson – not accepted – Lyall's rockcress
  Arabis macounii S. Watson – not accepted
  Arabis parishii S. Watson – not accepted – dwarf rockcress, Parish's rockcress
  Arabis perennans S. Watson – not accepted – perennial rockcress
  Arabis repanda S. Watson – not accepted – Repand's rockcress, Yosemite rockcress
  Arabis repanda var. repanda S. Watson – not accepted – Yosemite rockcress
  Arabis subpinnatifida S. Watson – not accepted – Klamath rockcress
  Arabis suffrutescens S. Watson – not accepted – woody rockcress
  Arabis suffrutescens var. suffrutescens S. Watson – not accepted – woody rockcress
  Aralia californica S. Watson – accepted – California spikenard
  Arenaria aculeata S. Watson – not accepted – prickly sandwort, spiny sandwort
  Arenaria fendleri var. glabrescens S. Watson – not accepted
  Arenaria fendleri var. subcongesta S. Watson – not accepted
  Arenaria howellii S. Watson – not accepted – Howell's sandwort
  Arenaria macradenia S. Watson – not accepted – Mojave sandwort, shrubby sandwort
  Arenaria macradenia ssp. macradenia S. Watson – not accepted – Mojave sandwort
  Arenaria macradenia ssp. macradenia var. macradenia S. Watson – not accepted – Mojave sandwort
  Arenaria macradenia var. macradenia S. Watson – not accepted – Mojave sandwort
  Arenaria pusilla S. Watson – not accepted
  Aristolochia brevipes var. acuminata S. Watson – not accepted
  Artemisia forwoodii S. Watson – not accepted
  Asarum hartwegii S. Watson – accepted – Hartweg's wildginger
  Asarum lemmonii S. Watson – accepted – Lemmon's wildginger
  Asclepias albicans S. Watson – accepted – whitestem milkweed, wax milkweed, candelilla
  Asclepias cryptoceras S. Watson – accepted – Humboldt milkweed, pallid milkweed, cow cabbage, Humboldt Mountains milkweed
  Asclepias cryptoceras ssp. cryptoceras S. Watson – accepted – pallid milkweed, cow cabbage
  Aster forwoodii S. Watson – not accepted
  Astragalus accidens S. Watson – accepted – Rogue River milkvetch
  Astragalus accidens var. accidens S. Watson – accepted – Rogue River milkvetch
  Astragalus acutirostris S. Watson – accepted – sharpkeel milkvetch
  Astragalus ampullarius S. Watson – accepted – gumbo milk-vetch
  Astragalus atratus S. Watson – accepted – mourning milkvetch
  Astragalus atratus var. atratus S. Watson – accepted – mourning milkvetch
  Astragalus castaneiformis S. Watson – accepted – chestnut milkvetch, chestnut milk-vetch
  Astragalus congdonii S. Watson – accepted – Congdon's milkvetch
  Astragalus conjunctus S. Watson – accepted – Idaho milkvetch
  Astragalus conjunctus var. conjunctus S. Watson – accepted – Idaho milkvetch
  Astragalus diurnus S. Watson – not accepted
  Astragalus episcopus S. Watson – accepted – bishop's milkvetch
  Astragalus episcopus var. episcopus S. Watson – not accepted – bishop's milkvetch, Bishop milkvetch
  Astragalus forwoodii S. Watson – not accepted
  Astragalus forwoodii var. forwoodii S. Watson – not accepted
  Astragalus giganteus S. Watson – accepted – giant milkvetch, giant loco
  Astragalus hypoxylus S. Watson – accepted – Huachuca Mountain milkvetch, Huachuca milk-vetch
  Astragalus iodanthus S. Watson – accepted – Humboldt River milkvetch
  Astragalus iodanthus var. iodanthus S. Watson – accepted – Humboldt River milkvetch
  Astragalus jejunus S. Watson – accepted – starveling milkvetch
  Astragalus jejunus var. jejunus S. Watson – not accepted – starveling milkvetch
  Astragalus kentrophyta var. elatus S. Watson – accepted – tall spiny milkvetch
  Astragalus lectulus S. Watson – not accepted
  Astragalus matthewsii S. Watson – not accepted
  Astragalus misellus S. Watson – accepted – pauper milkvetch
  Astragalus misellus var. misellus S. Watson – accepted – pauper milkvetch
  Astragalus mohavensis S. Watson – accepted – Mojave milkvetch
  Astragalus mohavensis var. mohavensis S. Watson – accepted – Mojave milkvetch
  Astragalus obscurus S. Watson – accepted – arcane milkvetch
  Astragalus oophorus S. Watson – accepted – egg milkvetch
  Astragalus oophorus var. oophorus S. Watson – accepted – egg milkvetch
  Astragalus porrectus S. Watson – accepted – Lahontan milkvetch
  Astragalus pterocarpus S. Watson – accepted – winged milkvetch, wing milkvetch
  Astragalus robbinsii var. occidentalis S. Watson – accepted – western milkvetch, Lamoille Canyon milkvetch, Robbins milk-vetch
  Astragalus sesquiflorus S. Watson – accepted – sandstone milkvetch
  Astragalus tegetarius S. Watson – not accepted
  Astragalus terminalis S. Watson – accepted – railhead milkvetch
  Astragalus thompsonae S. Watson – not accepted
  Astragalus thompsoniae S. Watson – not accepted
  Astragalus troglodytus S. Watson – accepted – creeping milkvetch, cliff-dweller's milkvetch
  Astragalus vaseyi S. Watson – not accepted
  Astragalus vaseyi var. vaseyi S. Watson – not accepted
  Astragalus wingatanus S. Watson – accepted – Fort Wingate milkvetch
  Athysanus pusillus var. glabrior S. Watson – not accepted
  Atriplex alaskensis S. Watson – not accepted – Alaska orache
  Atriplex breweri S. Watson – not accepted
  Atriplex coronata S. Watson – accepted – crownscale
  Atriplex coronata var. coronata S. Watson – accepted – crownscale
  Atriplex corrugata S. Watson – accepted – mat saltbush
  Atriplex decumbens S. Watson – not accepted
  Atriplex expansa S. Watson – not accepted
  Atriplex fasciculata S. Watson – not accepted
  Atriplex linearis S. Watson – accepted – thinleaf fourwing saltbush
  Atriplex nuttallii S. Watson – not accepted – Nuttall's saltbush
  Atriplex parishii S. Watson – accepted – Parrish's brittlescale, Parish's saltbush
  Atriplex parishii var. parishii S. Watson – accepted – Parish's saltbush
  Atriplex parryi S. Watson – accepted – Parry's saltbush
  Atriplex powellii S. Watson – accepted – Powell's saltbush, Powell's orache, Powell's saltweed
  Atriplex powellii var. powellii S. Watson – accepted – Powell's saltweed
  Atriplex saccaria S. Watson – accepted – stalked orache, sack saltweed, sack saltbush
  Atriplex saccaria var. saccaria S. Watson – accepted – stalked saltbush
  Atriplex texana S. Watson – not accepted – Texas saltbush
  Atriplex wolfii S. Watson – accepted – Wolf's saltweed
  Atriplex wolfii var. wolfii S. Watson – accepted – Wolf's saltweed
  Atriplex wrightii S. Watson – accepted – Wright's saltbush
  Ayenia filiformis S. Watson – accepted – Trans-Pecos ayenia
  Ayenia glabra S. Watson – accepted – smooth ayenia
  Ayenia jaliscana S. Watson – accepted
  Bahia schaffneri S. Watson – accepted – Schaffner's bahia
  Bidens connata var. pinnata S. Watson – not accepted
  Bloomeria clevelandii S. Watson – accepted – San Diego goldenstar
  Boerhavia pterocarpa S. Watson – accepted – Apache Pass spiderling
  Boerhavia triquetra S. Watson – accepted – slender spiderling
  Boerhavia triquetra var. triquetra S. Watson – accepted – slender spiderling
  Bolandra oregana S. Watson – accepted – northern false coolwort
  Bouteloua polystachya S. Watson – not accepted
  Bouteloua polystachya var. vestita S. Watson – not accepted
  Bouteloua texana S. Watson – not accepted
  Brickellia longifolia S. Watson – accepted – longleaf brickellbush, long leaf brickellbush
  Brickellia longifolia var. longifolia S. Watson – accepted – longleaf brickellbush
  Brodiaea bridgesii S. Watson – not accepted
  Brodiaea douglasii S. Watson – not accepted
  Brodiaea filifolia S. Watson – accepted – thread-leaved brodiaea, threadleaf brodiaea
  Brodiaea gracilis S. Watson – not accepted
  Brodiaea howellii S. Watson – not accepted
  Brodiaea lemmoniae S. Watson – not accepted
  Brodiaea palmeri S. Watson – not accepted
  Brodiaea stellaris S. Watson – accepted – starflower brodiaea
  Brongniartia minutifolia S. Watson – accepted – littleleaf greentwig, little leaf Brongniartia
  Calandrinia breweri S. Watson – accepted – Brewer's redmaids
  Calandrinia cotyledon S. Watson – not accepted
  Calandrinia howellii S. Watson – not accepted
  Calandrinia oppositifolia S. Watson – not accepted
  Calathea crotalifera S. Watson – accepted – rattlesnake plant
  Calliandra coulteri S. Watson – not accepted – Coulter's stickpea
  Callitriche sepulta S. Watson – not accepted
  Calochortus aureus S. Watson – accepted – golden mariposa lily
  Calochortus catalinae S. Watson – accepted – Santa Catalina mariposa lily
  Calochortus clavatus S. Watson – accepted – clubhair mariposa lily
  Calochortus clavatus var. clavatus S. Watson – accepted – clubhair mariposa lily
  Calochortus eurycarpus S. Watson – accepted – bigpod mariposa lily, white mariposa lily
  Calochortus flexuosus S. Watson – accepted – weakstem mariposa lily, straggling mariposa lily, winding mariposa lily
  Calochortus greenei S. Watson – accepted – Greene's mariposa lily
  Calochortus gunnisonii S. Watson – accepted – Gunnison mariposa lily, Gunnison's mariposa lily
  Calochortus gunnisonii var. gunnisonii S. Watson – accepted – Gunnison's mariposa lily, Gunnison mariposa lily
  Calochortus howellii S. Watson – accepted – Howell's mariposa lily
  Calochortus longebarbatus S. Watson – accepted – longbeard mariposa lily
  Calochortus longebarbatus var. longebarbatus S. Watson – accepted – longbeard mariposa lily, long-haired star-tulip
  Calochortus luteus var. oculatus S. Watson – not accepted
  Calochortus nudus S. Watson – accepted – naked mariposa lily
  Calochortus palmeri S. Watson – accepted – Palmer's mariposa lily
  Calochortus palmeri var. palmeri S. Watson – accepted – Palmer's mariposa lily
  Calochortus venustus var. purpurascens S. Watson – not accepted
  Calyptridium quadripetalum S. Watson – not accepted
  Calyptridium roseum S. Watson – not accepted
  Camassia cusickii S. Watson – accepted – Cusick's camas
  Camassia howellii S. Watson – accepted – Howell's camas
  Canbya aurea S. Watson – accepted – golden pygmypoppy, yellow canbya
  Cardamine breweri S. Watson – accepted – Brewer's bittercress, Brewer bittercress
  Cardamine breweri var. breweri S. Watson – not accepted – Brewer's bittercress
  Cardamine gambelii S. Watson – not accepted
  Cardamine gambellii S. Watson – not accepted
  Cardamine lyallii S. Watson – not accepted
  Cardamine pratensis var. occidentalis S. Watson – not accepted
  Cassia armata S. Watson – not accepted
  Castilleja flava S. Watson – accepted – yellow paintbrush, yellow Indian paintbrush
  Castilleja flava var. flava S. Watson – accepted – yellow Indian paintbrush
  Caulanthus S. Watson – accepted – wild cabbage
  Caulanthus amplexicaulis S. Watson – accepted – claspingleaf wild cabbage
  Caulanthus amplexicaulis var. amplexicaulis S. Watson – not accepted – claspingleaf wild cabbage
  Caulanthus coulteri S. Watson – accepted – Coulter's wild cabbage
  Caulanthus coulteri var. coulteri S. Watson – not accepted – Coulter's wild cabbage
  Caulanthus glaucus S. Watson – accepted – bigleaf wildcabbage, glaucous wild cabbage
  Caulanthus inflatus S. Watson – accepted – desert candle
  Caulanthus lemmonii S. Watson – accepted – Lemmon's wild cabbage
  Caulanthus pilosus S. Watson – accepted – hairy wildcabbage, hairy wild cabbage
  Ceanothus decumbens S. Watson – not accepted
  Celosia palmeri S. Watson – accepted – Palmer's cock's comb
  Celtis brevipes S. Watson – not accepted
  Cerastium sericeum S. Watson – not accepted
  Cercocarpus intricatus S. Watson – not accepted – littleleaf mountain-mahogany
  Cercocarpus intricatus var. intricatus S. Watson – not accepted – littleleaf mountain-mahogany
  Cercocarpus parvifolius var. glaber S. Watson – not accepted
  Cercocarpus parvifolius var. paucidentatus S. Watson – not accepted
  Chenopodium fremontii S. Watson – accepted – Fremont's goosefoot
  Chenopodium fremontii var. fremontii S. Watson – not accepted – Fremont's goosefoot
  Chenopodium fremontii var. incanum S. Watson – not accepted
  Chenopodium leptophyllum var. oblongifolium S. Watson – not accepted
  Chenopodium leptophyllum var. subglabrum S. Watson – not accepted
  Chenopodium olidum S. Watson – not accepted
  Chlorogalum parviflorum S. Watson – accepted – smallflower soap plant
  Chorizanthe breweri S. Watson – accepted – San Luis Obispo spineflower, Brewer's spineflower
  Chorizanthe cuspidata S. Watson – accepted – San Francisco spineflower
  Chorizanthe cuspidata var. cuspidata S. Watson – accepted – San Francisco spineflower, San Francisco Bay spineflower
  Chorizanthe fernandina S. Watson – not accepted
  Chorizanthe palmeri S. Watson – accepted – Palmer's spineflower
  Chorizanthe parryi S. Watson – accepted – San Bernardino spineflower
  Chorizanthe parryi var. parryi S. Watson – accepted – San Bernardino spineflower, Parry's spineflower
  Chorizanthe spinosa S. Watson – accepted – Mojave spineflower
  Chorizanthe valida S. Watson – accepted – Sonoma spineflower
  Chorizanthe wheeleri S. Watson – accepted – Santa Barbara spineflower
  Chorizanthe xanti S. Watson – accepted – Riverside spineflower
  Chorizanthe xanti var. xanti S. Watson – accepted – Riverside spineflower
  Cicuta bolanderi S. Watson – not accepted – Bolander water-hemlock
  Cimicifuga arizonica S. Watson – not accepted – Arizona bugbane
  Cimicifuga laciniata S. Watson – not accepted – Mt. Hood bugbane
  Cladium mariscus var. californicum S. Watson – not accepted
  Claytonia cordifolia S. Watson – accepted – heartleaf springbeauty
  Claytonia nevadensis S. Watson – accepted – Sierra springbeauty
  Claytonia triphylla S. Watson – not accepted
  Claytonia umbellata S. Watson – accepted – Great Basin springbeauty
  Clematis fremontii S. Watson – accepted – Fremont's leather flower
  Clematis ligusticifolia var. californica S. Watson – not accepted – California clematis
  Cleome sparsifolia S. Watson – not accepted – fewleaf cleome, fewleaf spiderflower
  Cleomella brevipes S. Watson – accepted – shortstalk cleomella, shortstalk stinkweed
  Cleomella plocasperma S. Watson – accepted – alkali stinkweed, alkali cleomella, twisted cleomella
  Coldenia mexicana S. Watson – not accepted
  Collinsia wrightii S. Watson – not accepted
  Colubrina greggii S. Watson – accepted – Sierran nakedwood, Sierra nakedwood
  Colubrina greggii var. greggii S. Watson – not accepted – Gregg's nakedwood
  Convolvulus longipes S. Watson – not accepted
  Corallorhiza bigelovii S. Watson – not accepted
  Corallorrhiza bigelovii S. Watson – not accepted
  Cordylanthus kingii S. Watson – accepted – King's bird'sbeak, King's bird's-beak
  Cordylanthus kingii ssp. kingii S. Watson – accepted – King's bird'sbeak, King's bird's-beak
  Corydalis bidwelliae S. Watson – not accepted
  Corydalis brandegeei S. Watson – not accepted
  Corydalis cusickii S. Watson – not accepted
  Cotyledon oregonensis S. Watson – not accepted
  Crossosoma bigelovii S. Watson – accepted – Bigelow's crossosoma, ragged rockflower
  Crossosoma bigelovii var. bigelovii S. Watson – not accepted – ragged rockflower
  Croton calvescens S. Watson – not accepted
  Croton elaeagnoides S. Watson – not accepted
  Croton palmeri S. Watson – accepted
  Croton pringlei S. Watson – not accepted
  Croton tenuilobus S. Watson – accepted
  Croton tenuis S. Watson – not accepted
  Cucurbita palmata S. Watson – accepted – coyote melon, coyote gourd
  Cupressus guadalupensis S. Watson – not accepted – ciprés brillante
  Cymopterus bipinnatus S. Watson – not accepted
  Cymopterus longipes S. Watson – accepted – longstalk springparsley
  Cymopterus nivalis S. Watson – accepted – snowline springparsley
  Cymopterus purpureus S. Watson – accepted – purple spring parsley, purple springparsley
  Dalea amoena S. Watson – not accepted
  Dalea californica S. Watson – not accepted
  Dalea glaberrima S. Watson – not accepted
  Dalea kingii S. Watson – not accepted
  Dalea orcuttii S. Watson – not accepted
  Dalea polydenia var. subnuda S. Watson – not accepted
  Dalea scariosa S. Watson – accepted – Albuquerque prairie clover, Albuquerque prairieclover
  Dasylirion wheeleri S. Watson – accepted – Sotol de desierto, sotol, common sotol
  Delphinium elatum var. occidentale S. Watson – not accepted
  Delphinium glaucum S. Watson – accepted – tower larkspur, mountain larkspur, Sierra larkspur
  Delphinium madrense S. Watson – accepted – Sierra Madre larkspur
  Dentaria californica var. pachystigma S. Watson – not accepted
  Desmanthus bicornutus S. Watson – accepted – two-horn bundleflower, ruby bundleflower
  Desmanthus obtusus S. Watson – accepted – bluntpod bundleflower
  Desmodium arizonicum S. Watson – accepted – Arizona ticktrefoil, Arizona tick trefoil
  Desmodium scopulorum S. Watson – accepted – Sonoran ticktrefoil, Sonoran tick trefoil
  Dicentra pauciflora S. Watson – accepted – shorthorn steer's-head
  Douglasia dentata S. Watson – not accepted
  Draba aureola S. Watson – accepted – Mt. Lassen draba
  Draba breweri S. Watson – accepted – cushion draba
  Draba breweri var. breweri S. Watson – not accepted – cushion draba
  Draba corrugata S. Watson – accepted – Southern California draba
  Draba corrugata var. corrugata S. Watson – not accepted – Southern California draba
  Draba cuneifolia var. integrifolia S. Watson – accepted – wedgeleaf whitlowgrass, wedgeleaf draba
  Draba howellii S. Watson – accepted – rosette draba
  Draba lemmonii S. Watson – accepted – granite draba, Lemmon's draba
  Draba lemmonii var. lemmonii S. Watson – not accepted – granite draba, Lemmon's draba
  Draba nivalis var. elongata S. Watson – not accepted
  Draba subsessilis S. Watson – not accepted
  Drymaria fendleri S. Watson – not accepted
  Drymaria viscosa S. Watson – accepted – sticky drymary
  Elaterium bigelovii S. Watson – not accepted
  Eleocharis cancellata S. Watson – accepted – Arizona spikerush
  Eleocharis rostellata var. occidentalis S. Watson – not accepted
  Ephedra californica S. Watson – accepted – California Mormon tea, California jointfir
  Ephedra californica var. californica S. Watson – not accepted – California jointfir
  Ephedra nevadensis S. Watson – accepted – Nevada Mormon tea, Nevada ephedra, Nevada jointfir
  Ephedra nevadensis var. nevadensis S. Watson – not accepted – Nevada jointfir
  Ephedra torreyana S. Watson – accepted – Torrey's ephedra, Torrey's Mormon tea, Torrey's jointfir
  Ephedra torreyana var. torreyana S. Watson – accepted – Torrey's jointfir, Torrey's Mormon tea
  Eragrostis elliottii S. Watson – accepted – field lovegrass
  Eragrostis palmeri S. Watson – accepted – Rio Grande lovegrass
  Eremochloe bigelovii S. Watson – not accepted
  Eremochloe kingii S. Watson – not accepted
  Eremochloe thurberi S. Watson – not accepted
  Erigeron sanctarum S. Watson – accepted – saints fleabane
  Eriogonum allenii S. Watson – accepted – shale barren buckwheat, shalebarren buckwheat
  Eriogonum apiculatum S. Watson – accepted – San Jacinto buckwheat
  Eriogonum baileyi S. Watson – accepted – Bailey's buckwheat
  Eriogonum baileyi var. baileyi S. Watson – accepted – Bailey's buckwheat
  Eriogonum baileyi var. tomentosum S. Watson – not accepted
  Eriogonum cithariforme S. Watson – accepted – Cithara buckwheat
  Eriogonum cithariforme var. cithariforme S. Watson – accepted – Cithara buckwheat
  Eriogonum deserticola S. Watson – accepted – Colorado Desert buckwheat, desert wild buckwheat
  Eriogonum esmeraldense S. Watson – accepted – Esmeralda buckwheat
  Eriogonum esmeraldense var. esmeraldense S. Watson – accepted – Esmeralda buckwheat
  Eriogonum foliosum S. Watson – accepted – Baja buckwheat
  Eriogonum giganteum S. Watson – accepted – St. Catherine's lace
  Eriogonum giganteum var. giganteum S. Watson – accepted – St. Catherine's lace
  Eriogonum gracilipes S. Watson – accepted – White Mountain buckwheat
  Eriogonum gracillimum S. Watson – accepted – rose and white buckwheat
  Eriogonum harvardii S. Watson – not accepted
  Eriogonum havardii S. Watson – accepted – Havard's buckwheat
  Eriogonum hookeri S. Watson – accepted – Hooker's wild buckwheat, Hooker's eriogonum, Hooker's buckwheat
  Eriogonum insigne S. Watson – not accepted – ladder wild buckwheat, exalted buckwheat, ladder buckwheat
  Eriogonum jamesii var. flavescens S. Watson – not accepted – James' buckwheat
  Eriogonum jonesii S. Watson – accepted – Jones' buckwheat
  Eriogonum lemmonii S. Watson – accepted – Lemmon's buckwheat, volcanic buckwheat
  Eriogonum mohavense S. Watson – accepted – Western Mojave buckwheat
  Eriogonum molestum S. Watson – accepted – pineland buckwheat
  Eriogonum nudum var. oblongifolium S. Watson – accepted – naked buckwheat
  Eriogonum nudum var. pauciflorum S. Watson – accepted – naked buckwheat
  Eriogonum ochrocephalum S. Watson – accepted – ocherflower buckwheat, whitewoolly buckwheat
  Eriogonum ochrocephalum var. ochrocephalum S. Watson – accepted – whitewoolly buckwheat
  Eriogonum ordii S. Watson – accepted – Fort Mojave buckwheat
  Eriogonum parishii S. Watson – accepted – mountainmist
  Eriogonum pendulum S. Watson – accepted – Waldo buckwheat
  Eriogonum puberulum S. Watson – not accepted – puberulent buckwheat, Red Creek buckwheat
  Eriogonum saxatile S. Watson – accepted – rock buckwheat, hoary buckwheat
  Eriogonum shockleyi S. Watson – accepted – Shockley's wild buckwheat, Shockley's buckwheat
  Eriogonum shockleyi var. shockleyi S. Watson – not accepted – Shockley's buckwheat
  Eriogonum subreniforme S. Watson – accepted – kidney-shape wild buckwheat, kidneyshape buckwheat
  Eriogonum suffruticosum S. Watson – accepted – bushy wild-buckwheat, bushy buckwheat
  Eriogonum sulcatum S. Watson – not accepted
  Eriogonum thompsonae var. thompsonae S. Watson – not accepted – Thompson wild-buckwheat
  Eriogonum thompsoniae S. Watson – accepted – Thompson's wild buckwheat, Thompson's buckwheat
  Eriogonum thompsoniae var. thompsoniae S. Watson – accepted – Thompson's buckwheat
  Eriogonum triste S. Watson – not accepted
  Eriogonum ursinum S. Watson – accepted – Bear Valley buckwheat
  Eriogonum ursinum var. ursinum S. Watson – accepted – Bear Valley buckwheat
  Eriogonum wrightii var. subscaposum S. Watson – accepted – bastardsage
  Eriogynia uniflora S. Watson – not accepted
  Erysimum arenicola S. Watson – accepted – Sierra wallflower, cascade wallflower
  Erysimum arenicola var. arenicola S. Watson – not accepted – cascade wallflower
  Erythronium citrinum S. Watson – accepted – cream fawnlily
  Erythronium citrinum var. citrinum S. Watson – not accepted – cream fawnlily
  Erythronium hendersonii S. Watson – accepted – Henderson's fawnlily
  Erythronium howellii S. Watson – not accepted – Howell's fawnlily
  Erythronium montanum S. Watson – accepted – white avalanche-lily
  Erythronium purpurascens S. Watson – accepted – purple fawnlily
  Eschscholzia minutiflora S. Watson – accepted – pygmy goldenpoppy, pygmy poppy
  Eschscholzia minutiflora ssp. minutiflora S. Watson – accepted – smallflower goldenpoppy, pygmy poppy
  Euphorbia biformis S. Watson – not accepted
  Euphorbia capitellata var. laxiflora S. Watson – not accepted
  Euphorbia digitata S. Watson – not accepted
  Euphorbia exclusa S. Watson – not accepted
  Euphorbia gracillima S. Watson – accepted – Mexican sandmat
  Euphorbia guadalajarana S. Watson – accepted
  Euphorbia hexagonoides S. Watson – accepted
  Euphorbia intermixta S. Watson – not accepted
  Euphorbia lineata S. Watson – accepted
  Euphorbia longicornuta S. Watson – accepted
  Euphorbia longiramosa S. Watson – not accepted
  Euphorbia misella S. Watson – accepted
  Euphorbia pediculifera var. linearifolia S. Watson – accepted
  Euphorbia petrina S. Watson – accepted
  Euphorbia plicata S. Watson – not accepted
  Euphorbia plummerae S. Watson – not accepted
  Euphorbia plummeriae S. Watson – not accepted
  Euphorbia polycarpa var. vestita S. Watson – not accepted
  Euphorbia portulana S. Watson – not accepted
  Euphorbia rattanii S. Watson – not accepted
  Euphorbia retroscabra S. Watson – not accepted
  Euphorbia subpeltata S. Watson – accepted
  Euphorbia subreniformis S. Watson – accepted
  Euphorbia tenera S. Watson – not accepted
  Euphorbia tomentulosa S. Watson – accepted
  Euphorbia uniglandulosa S. Watson – not accepted
  Festuca ovina var. brevifolia S. Watson – not accepted
  Fimbristylis thermalis S. Watson – accepted – hotsprings fimbry, hot springs fimbry
  Fragaria virginiana var. glauca S. Watson – not accepted
  Frankenia palmeri S. Watson – accepted – Palmer's seaheath, Palmer's frankenia
  Frasera albomarginata S. Watson – accepted – desert frasera, desert elkweed
  Frasera albomarginata var. albomarginata S. Watson – not accepted – desert elkweed
  Galium bifolium S. Watson – accepted – twinleaf bedstraw, twin-leaf bedstraw
  Garrya flavescens S. Watson – accepted – yellowleaf silktassel, ashy silktassel
  Garrya flavescens ssp. flavescens S. Watson – not accepted – ashy silktassel
  Geranium carolinianum var. longipes S. Watson – not accepted
  Geranium wislizeni S. Watson – accepted – Huachuca Mountain geranium, Huachuca geranium
  Geranium wislizenii S. Watson – not accepted
  Gilia latifolia S. Watson – not accepted – broad-leaf gily-flower, broadleaf gilia
  Gilia latifolia var. latifolia S. Watson – not accepted – broadleaf gilia
  Glyceria grandis S. Watson – accepted – American mannagrass, manna grass
  Glyceria grandis f. grandis S. Watson – not accepted
  Glyceria grandis var. grandis S. Watson – accepted – American mannagrass
  Godetia hispidula S. Watson – not accepted
  Habenaria sparsiflora S. Watson – not accepted
  Halostachys occidentalis S. Watson – not accepted
  Haplopappus cervinus S. Watson – not accepted
  Haplopappus crevinus S. Watson – not accepted
  Hastingsia S. Watson – accepted – rushlily
  Hastingsia bracteosa S. Watson – accepted – largeflower rushlily
  Hastingsia bracteosa var. bracteosa S. Watson – not accepted – largeflower rushlily
  Hebanthe palmeri S. Watson – not accepted
  Hechtia texensis S. Watson – accepted – Guapilla de Texas, Texas false agave
  Helianthus mollis var. cordatus S. Watson – not accepted
  Hermannia pauciflora S. Watson – accepted – Santa Catalina burstwort, hierba del soldado
  Hermidium alipes S. Watson – not accepted
  Hesperochiron S. Watson – accepted
  Heteranthera mexicana S. Watson – accepted – Mexican mudplantain
  Heuchera cylindrica var. alpina S. Watson – not accepted – alpine alumroot
  Heuchera racemosa S. Watson – not accepted
  Hibiscus biseptus S. Watson – accepted – Arizona rosemallow, Arizona rose-mallow
  Hollisteria S. Watson – accepted
  Hollisteria lanata S. Watson – accepted – false spikeflower
  Horkelia fusca var. tenella S. Watson – accepted – pinewoods horkelia
  Horkelia purpurascens S. Watson – not accepted
  Horkelia sericata S. Watson – accepted – silky horkelia
  Horsfordia palmeri S. Watson – not accepted
  Hydrophyllum capitatum var. alpinum S. Watson – accepted – alpine waterleaf
  Hymenocallis humilis S. Watson – not accepted
  Hymenocallis palmeri S. Watson – accepted – alligatorlily
  Hypericum paucifolium S. Watson – accepted
  Iris bracteata S. Watson – accepted – Siskiyou iris
  Iris tenuis S. Watson – accepted – Clackamas iris
  Isoloma jaliscanum S. Watson – not accepted
  Ivesia baileyi S. Watson – accepted – Bailey's ivesia
  Ivesia baileyi var. baileyi S. Watson – accepted – Bailey's ivesia
  Ivesia baileyi var. setosa S. Watson – not accepted – Bailey's ivesia
  Ivesia kingii S. Watson – accepted – Ash Meadows ivesia, King's ivesia, King's mousetail
  Ivesia kingii var. kingii S. Watson – accepted – alkali ivesia
  Ivesia lemmonii S. Watson – not accepted
  Ivesia pinnatifida S. Watson – not accepted
  Ivesia shockleyi S. Watson – accepted – Shockley's ivesia, sky mousetail
  Ivesia shockleyi var. shockleyi S. Watson – accepted – Shockley's ivesia, sky mousetail
  Ivesia utahensis S. Watson – accepted – Utah mousetail
  Jacquemontia palmeri S. Watson – not accepted
  Juglans californica S. Watson – accepted – California black walnut, Southern California walnut
  Juglans californica var. californica S. Watson – not accepted – California walnut, southern California black walnut
  Juncus nevadensis S. Watson – accepted – Nevada rush, Sierra rush
  Juncus nevadensis var. nevadensis S. Watson – not accepted – Sierra rush, Nevada rush
  Juncus oreganus S. Watson – not accepted
  Kochia americana S. Watson – accepted – greenmolly, greenmolly kochia, greenmolly summercypress
  Kochia americana var. vestita S. Watson – not accepted
  Kochia californica S. Watson – accepted – Mojave kochia, rusty molly
  Krameria bicolor S. Watson – accepted
  Laphamia megalocephala S. Watson – not accepted
  Lathyrus bolanderi S. Watson – not accepted
  Lathyrus cusickii S. Watson – not accepted
  Lathyrus nevadensis S. Watson – accepted – Sierra pea
  Lathyrus nevadensis ssp. nevadensis S. Watson – not accepted – Sierra pea
  Lathyrus nevadensis var. nevadensis S. Watson – accepted – Sierra pea, wild pea
  Lathyrus nuttallii S. Watson – not accepted
  Lathyrus parviflorus S. Watson – accepted
  Lavatera occidentalis S. Watson – not accepted
  Lavatera venosa S. Watson – not accepted
  Lepidium fremontii S. Watson – accepted – desert pepperweed
  Lepidium fremontii var. fremontii S. Watson – not accepted – desert pepperweed
  Lepidium integrifolium var. heterophyllum S. Watson – not accepted – thickleaf pepperweed
  Lepidium montanum var. alpinum S. Watson – not accepted – alpine pepperweed
  Lepidium nanum S. Watson – accepted – dwarf pepperweed
  Lepidospartum latisquamum S. Watson – accepted – Nevada broomsage
  Lesquerella S. Watson – not accepted – bladderpod species, bladderpod
  Lesquerella arctica var. purshii S. Watson – not accepted
  Lesquerella arizonica S. Watson – not accepted – Arizona bladderpod
  Lesquerella berlandieri S. Watson – not accepted
  Lesquerella cinerea S. Watson – not accepted – basin bladderpod
  Lesquerella douglasii S. Watson – not accepted – Douglas' bladderpod
  Lesquerella gordonii var. sessilis S. Watson – not accepted
  Lesquerella kingii S. Watson – not accepted – King's bladderpod, King bladderpod
  Lesquerella kingii ssp. kingii S. Watson – not accepted – King's bladderpod, King bladderpod
  Lesquerella kingii ssp. kingii var. kingii S. Watson – not accepted – King bladderpod, King's bladderpod
  Lesquerella kingii var. kingii S. Watson – not accepted – King bladderpod
  Lesquerella occidentalis S. Watson – not accepted – western bladderpod
  Lesquerella occidentalis ssp. occidentalis S. Watson – not accepted – western bladderpod
  Lesquerella palmeri S. Watson – not accepted – bladder pod
  Lesquerella wardii S. Watson – not accepted – Ward's bladderpod
  Leucaena greggii S. Watson – accepted
  Ligusticum filicinum S. Watson – accepted – fernleaf licoriceroot, fernleaf licorice-root
  Ligusticum tenuifolium S. Watson – accepted – Idaho licorice-root
  Lilium bolanderi S. Watson – accepted – Bolander's lily
  Lilium grayi S. Watson – accepted – Gray's lily
  Lilium parryi S. Watson – accepted – Parry lily, lemon lily
  Lilium rubescens S. Watson – accepted – redwood lily
  Linum kingii S. Watson – accepted – King's flax
  Loeselia greggii S. Watson – accepted – Chisos Mountain false calico
  Lonicera utahensis S. Watson – accepted – Utah honeysuckle
  Lupinus andersonii S. Watson – accepted – Anderson's lupine
  Lupinus andersonii var. grayi S. Watson – not accepted
  Lupinus arcticus S. Watson – accepted – arctic lupine
  Lupinus arcticus ssp. arcticus S. Watson – accepted – arctic lupine
  Lupinus aridus var. utahensis S. Watson – not accepted
  Lupinus barbiger S. Watson – accepted – bearded lupine
  Lupinus brevicaluis S. Watson – not accepted
  Lupinus brevicaulis S. Watson – accepted – shortstem lupine
  Lupinus burkei S. Watson – accepted – largeleaf lupine
  Lupinus burkei ssp. burkei S. Watson – accepted – largeleaf lupine, Burke's lupine
  Lupinus chamissonis var. longifolius S. Watson – not accepted
  Lupinus chihuahuensis S. Watson – accepted – Chihuahuan lupine
  Lupinus concinnus var. arizonicus S. Watson – not accepted
  Lupinus cusickii S. Watson – accepted – Cusick's lupine
  Lupinus cusickii ssp. cusickii S. Watson – accepted – Cusick's lupine
  Lupinus havardii S. Watson – accepted – Big Bend bluebonnet, Chisos bluebonnet
  Lupinus holosericeus var. utahensis S. Watson – not accepted
  Lupinus kingii S. Watson – accepted – King's lupine
  Lupinus kingii var. kingii S. Watson – accepted – King's lupine
  Lupinus meionanthus var. heteranthus S. Watson – not accepted
  Lupinus micranthus var. microphyllus S. Watson – not accepted
  Lupinus micranthus var. trifidus S. Watson – not accepted
  Lupinus nootkatensis var. unalaskensis S. Watson – not accepted
  Lupinus nuttallii S. Watson – not accepted
  Lupinus onustus S. Watson – accepted – Plumas lupine
  Lupinus orcuttii S. Watson – not accepted
  Lupinus ornatus var. glabratus S. Watson – not accepted
  Lupinus palmeri S. Watson – accepted – bluebonnet lupine, Palmer's lupine
  Lupinus perennis ssp. perennis var. occidentalis S. Watson – not accepted – sundial lupine
  Lupinus perennis var. occidentalis S. Watson – accepted – sundial lupine
  Lupinus plattensis S. Watson – accepted – Nebraska lupine, Platte lupine
  Lupinus shockleyi S. Watson – accepted – purple desert lupine, desert lupine
  Lupinus sileri S. Watson – not accepted
  Lupinus sitgreavesii S. Watson – not accepted
  Lupinus uncialis S. Watson – accepted – inchhigh lupine, Lilliput lupine
  Lupinus wyethi S. Watson – not accepted
  Lupinus wyethi var. wyethi S. Watson – not accepted
  Lupinus wyethii S. Watson – accepted – Wyeth's lupine
  Lupinus wyethii ssp. wyethii S. Watson – accepted – Wyeth's lupine
  Luzula carolinae S. Watson – not accepted
  Luzula comosa var. macrantha S. Watson – not accepted
  Luzula comosa var. subsessilis S. Watson – not accepted
  Luzula divaricata S. Watson – accepted – forked woodrush
  Lychnis kingii S. Watson – not accepted
  Lychnis montana S. Watson – not accepted
  Malperia S. Watson – accepted – malperia
  Malperia tenuis S. Watson – accepted – brownturbans
  Malvastrum coulteri S. Watson – not accepted
  Malvastrum densiflorum S. Watson – not accepted
  Malvastrum palmeri S. Watson – not accepted
  Malvastrum rugelii S. Watson – not accepted
  Malvastrum tricuspidatum var. bicuspidatum S. Watson – not accepted
  Megarrhiza guadalupensis S. Watson – not accepted
  Mentzelia brandegeei S. Watson – not accepted
  Mentzelia dispersa S. Watson – accepted – bushy blazingstar, Nevada blazingstar, scattered blazingstar
  Mentzelia dispersa var. dispersa S. Watson – accepted – bushy blazingstar
  Mentzelia hirsutissima S. Watson – accepted – hairy blazingstar
  Mentzelia involucrata S. Watson – accepted – whitebract blazingstar, white bract stickleaf
  Mentzelia involucrata var. involucrata S. Watson – accepted – whitebract blazingstar, whitebract stickleaf
  Mertensia brevistyla S. Watson – accepted – shortstyle bluebells
  Mertensia paniculata var. nivalis S. Watson – not accepted
  Metastelma palmeri S. Watson – accepted
  Mimulus deflexus S. Watson – not accepted
  Mimulus filicaulis S. Watson – accepted – slenderstem monkeyflower, Hetch Hetchy monkey-flower
  Mimulus rubellus var. latiflorus S. Watson – not accepted
  Mirabilis greenei S. Watson – accepted – Greene's four o'clock
  Mirabilis multiflora var. pubescens S. Watson – accepted – Colorado four o'clock
  Mirabilis tenuiloba S. Watson – accepted – longlobe four o'clock
  Mirabilis tenuiloba var. tenuiloba S. Watson – accepted
  Montia howellii S. Watson – accepted – Howell's montia, Howell's minerslettuce
  Muhlenbergia scabra S. Watson – not accepted
  Muhlenbergia sylvatica var. setiglumis S. Watson – not accepted
  Myosurus cupulatus S. Watson – accepted – Arizona mousetail
  Myosurus sessilis S. Watson – accepted – vernal pool mousetail
  Myrica hartwegii S. Watson – accepted – Sierra bayberry, Sierra sweet-bay
  Nasturtium curvisiliqua var. nuttallii S. Watson – not accepted
  Nasturtium obtusum var. alpinum S. Watson – not accepted
  Nasturtium sinuatum var. columbiae S. Watson – not accepted
  Nemastylis pringlei S. Watson – not accepted
  Nissolia platycalyx S. Watson – accepted – broadsepal yellowhood
  Nitrophila S. Watson – accepted – niterwort
  Nolina microcarpa S. Watson – accepted – Palmilla sacahuista, sacahuista
  Nolina parryi S. Watson – accepted – Palmilla de Parry, Parry's sacahuista, Parry's beargrass
  Nolina texana S. Watson – accepted – Palmilla texana, sacahuista, Texas sacahuista
  Oenothera alyssoides var. villosa S. Watson – not accepted
  Oenothera fremontii S. Watson – not accepted
  Oenothera fremontii var. fremontii S. Watson – not accepted
  Oenothera guadalupensis S. Watson – not accepted
  Oenothera havardii S. Watson – accepted – Havard's evening-primrose, Havard's eveningprimrose, Havard's evening primrose
  Oenothera heterochroma S. Watson – not accepted
  Oenothera multijuga S. Watson – not accepted
  Oenothera palmeri S. Watson – not accepted
  Oenothera parryi S. Watson – not accepted
  Oenothera pterosperma S. Watson – not accepted
  Oenothera refracta S. Watson – not accepted
  Oenothera scapoidea var. purpurascens S. Watson – not accepted
  Oenothera strigulosa var. pubens S. Watson – not accepted
  Orogenia S. Watson – accepted – Indian potato
  Orogenia fusiformis S. Watson – accepted – California Indian potato
  Orogenia linearifolia S. Watson – accepted – Indianpotato, Great Basin Indian potato
  Orthocarpus pilosus S. Watson – not accepted
  Orthocarpus purpurascens var. latifolius S. Watson – not accepted
  Oryctes S. Watson – accepted
  Oryctes nevadensis S. Watson – accepted – Nevada oryctes
  Oxybaphus glaber S. Watson – not accepted
  Oxytheca inermis S. Watson – not accepted
  Pappophorum wrightii S. Watson – not accepted
  Paronychia wilkinsonii S. Watson – accepted – Wilkinson's nailwort, Wilkinson's whitlow-wort
  Paspalum elliottii S. Watson – not accepted
  Pectis palmeri S. Watson – not accepted
  Pedicularis furbishiae S. Watson – accepted – St. Johns River lousewort, Furbish's lousewort, Furbish lousewort
  Penstemon haydenii S. Watson – accepted – blowout penstemon, blowout beardtongue
  Penstemon kingii S. Watson – accepted – King's penstemon, King's beardtongue
  Petalonyx nitidus S. Watson – accepted – shinyleaf sandpaperplant, smooth sandpaper plant, shinyleaf sandpaper plant
  Petalostemon flavescens S. Watson – not accepted
  Petalostemon reverchonii S. Watson – not accepted
  Petalostemon sabinalis S. Watson – not accepted
  Peteria thompsoniae S. Watson – accepted – Thompson's peteria
  Peucedanum graveolens S. Watson – not accepted
  Peucedanum graveolens var. alpinum S. Watson – not accepted
  Peucedanum kingii S. Watson – not accepted
  Phacelia covillei S. Watson – accepted – Coville's phacelia
  Phaseolus polymorphus S. Watson – accepted – variable bean
  Phaseolus thompsonae S. Watson – not accepted
  Phyllospadix torreyi S. Watson – accepted – Torrey's surfgrass
  Physaria oregona S. Watson – accepted – Oregon twinpod
  Picea breweriana S. Watson – accepted – Brewer spruce, weeping spruce
  Pithecellobium sonorae S. Watson – not accepted
  Platanus wrightii S. Watson – accepted – Arizona sycamore
  Poa eatonii S. Watson – not accepted
  Poa kingii S. Watson – not accepted
  Podistera S. Watson – accepted
  Polemonium pauciflorum S. Watson – accepted – fewflower Jacob's-ladder
  Polemonium pauciflorum ssp. pauciflorum S. Watson – accepted – fewflower Jacob's-ladder
  Polygala alba var. suspecta S. Watson – not accepted
  Polygala palmeri S. Watson – accepted – Palmer's milkwort
  Polygala subspinosa S. Watson – not accepted – spiny polygala, spiny milkwort
  Polygonum bidwelliae S. Watson – accepted – Bidwell's knotweed, Bidwell knotweed
  Polygonum greenii S. Watson – not accepted
  Polygonum minimum S. Watson – accepted – broadleaf knotweed, zigzag knotweed, dwarf knotweed
  Polygonum muehlenbergii S. Watson – not accepted
  Polygonum muhlenbergii S. Watson – not accepted
  Populus balsamifera var. californica S. Watson – not accepted
  Populus fremontii S. Watson – accepted – cottonwood, Fremont's cottonwood
  Populus fremontii ssp. fremontii S. Watson – accepted – Fremont's cottonwood
  Populus fremontii var. wislizeni S. Watson – not accepted
  Populus trichocarpa var. cupulata S. Watson – not accepted
  Potentilla breweri S. Watson – accepted
  Potentilla breweri var. expansa S. Watson – not accepted
  Potentilla dissecta var. decurrens S. Watson – not accepted
  Potentilla diversifolia var. multisecta S. Watson – not accepted
  Potentilla glandulosa var. nevadensis S. Watson – not accepted
  Potentilla gracilis var. rigida S. Watson – not accepted
  Potentilla grayi S. Watson – accepted – Gray's cinquefoil
  Potentilla nivea var. dissecta S. Watson – not accepted
  Potentilla ovina var. pinnatisecta S. Watson – not accepted
  Potentilla supina var. nicollettii S. Watson – not accepted
  Potentilla wheeleri S. Watson – accepted – Kern cinquefoil
  Potentilla wheeleri var. wheeleri S. Watson – not accepted – Wheeler's cinquefoil
  Prosartes oregana S. Watson – not accepted
  Prosartes parvifolia S. Watson – not accepted
  Prosartes trachycarpa S. Watson – accepted – roughfruit fairybells
  Prosopis articulata S. Watson – not accepted – velvet mesquite
  Prosopis palmeri S. Watson – accepted – mesquite
  Prunus fremontii S. Watson – accepted – desert apricot
  Prunus mexicana S. Watson – accepted – Mexican plum
  Psilactis tenuis S. Watson – accepted – slender tansyaster
  Psoralea californica S. Watson – not accepted
  Psoralea castorea S. Watson – not accepted
  Psoralea mephitica S. Watson – not accepted
  Psoralea reverchonii S. Watson – not accepted
  Puccinellia maritima var. minor S. Watson – not accepted
  Pyrus occidentalis S. Watson – not accepted
  Randia obcordata S. Watson – accepted
  Ranunculus alismifolius var. montanus S. Watson – accepted – waterplantain buttercup
  Ranunculus ambigens S. Watson – accepted – waterplantain spearwort
  Ranunculus andersonii var. tenellus S. Watson – not accepted – desert buttercup, Anderson's buttercup
  Ranunculus bloomeri S. Watson – not accepted
  Ranunculus orthorhynchus var. alpinus S. Watson – not accepted
  Rhus ovata S. Watson – accepted – sugar sumac
  Ribes ambiguum S. Watson – not accepted
  Rosa engelmannii S. Watson – not accepted
  Rosa gymnocarpa var. pubescens S. Watson – not accepted
  Rosa gymnocarpa var. pubescens S. Watson – not accepted
  Rosa spithamea S. Watson – accepted – ground rose
  Rosa spithamea var. spithamea S. Watson – not accepted – ground rose
  Rumex occidentalis S. Watson – accepted – western dock
  Ruppia occidentalis S. Watson – not accepted
  Sageretia wrightii S. Watson – accepted – mock buckthorn, Wright's mock buckthorn
  Sagina crassicaulis S. Watson – not accepted
  Sagina occidentalis S. Watson – not accepted
  Sagittaria teres S. Watson – accepted – slender arrowhead, quill-leaved sagittaria
  Salix nevadensis S. Watson – not accepted
  Sanicula nevadensis S. Watson – not accepted
  Saxifraga eriophora S. Watson – not accepted – redfuzz saxifrage
  Saxifraga occidentalis S. Watson – not accepted – Alberta saxifrage
  Schobera occidentalis S. Watson – not accepted
  Schoberia occidentalis S. Watson – not accepted
  Scirpus nevadensis S. Watson – not accepted – Nevada bulrush
  Scoliopus hallii S. Watson – accepted – Oregon fetid adderstongue
  Sebastiania bilocularis S. Watson – accepted – arrow poison plant
  Sedum debile S. Watson – accepted – weakstem stonecrop, orpine stonecrop
  Sedum diffusum S. Watson – accepted
  Sedum divergens S. Watson – accepted – Pacific stonecrop
  Sedum divericatum S. Watson – not accepted
  Sedum radiatum S. Watson – accepted – Coast Range stonecrop
  Sedum radiatum ssp. radiatum S. Watson – not accepted – Coast Range stonecrop
  Sedum radiatum var. radiatum S. Watson – accepted – Coast Range stonecrop
  Sedum stelliforme S. Watson – accepted – Huachuca Mountain stonecrop
  Sida alata S. Watson – not accepted
  Sidalcea hendersonii S. Watson – accepted – Henderson's checkermallow, Henderson's checkerbloom
  Silene bernardina S. Watson – accepted – Palmer's campion, Palmer's catchfly
  Silene bernardina ssp. bernardina S. Watson – not accepted – Palmer's catchfly, Palmer's campion
  Silene campanulata S. Watson – accepted – Red Mountain catchfly
  Silene campanulata ssp. campanulata S. Watson – accepted – Red Mountain catchfly
  Silene campanulata var. greenei S. Watson – not accepted
  Silene grayi S. Watson – accepted – Maui catchfly, Gray's catchfly
  Silene hallii S. Watson – not accepted
  Silene lemmonii S. Watson – accepted – Lemmon's catchfly
  Silene lyallii S. Watson – not accepted
  Silene macounii S. Watson – not accepted
  Silene montana S. Watson – not accepted
  Silene montana var. montana S. Watson – not accepted
  Silene multinervia S. Watson – not accepted – manynerve catchfly
  Silene occidentalis S. Watson – accepted – western catchfly
  Silene occidentalis ssp. occidentalis S. Watson – not accepted – western catchfly
  Silene oregana S. Watson – accepted – Oregon campion, Oregon silene
  Silene parishii S. Watson – accepted – Parish's catchfly
  Silene parishii var. parishii S. Watson – not accepted – Parish's catchfly
  Silene pectinata S. Watson – not accepted
  Silene platyota S. Watson – not accepted
  Silene sargentii S. Watson – accepted – Sargent's campion, Sargent's catchfly
  Silene shockleyi S. Watson – not accepted
  Silene spaldingii S. Watson – accepted – Spalding's catchfly, Spalding's silene
  Silene thurberi S. Watson – accepted – woolly catchfly
  Silene verecunda S. Watson – accepted – Delores' campion, San Francisco campion
  Silene verecunda ssp. verecunda S. Watson – not accepted – San Francisco campion, Mission Dolores campion
  Sisyrinchium bellum S. Watson – accepted – western blue-eyed grass
  Smelowskia fremontii S. Watson – not accepted
  Sophora arizonica S. Watson – not accepted – Arizona necklacepod, Arizona sophora, mescalbean
  Spiraea caespitosa var. elatior S. Watson – not accepted
  Spiraea occidentalis S. Watson – not accepted
  Stanfordia S. Watson – not accepted – stanfordia
  Stanfordia californica S. Watson – not accepted – St. Francis cabbage
  Stenanthium robustum S. Watson – not accepted
  Stillingia linearifolia S. Watson – accepted – queen's-root, narrowleaf stillingia
  Stillingia paucidentata S. Watson – accepted – Mojave toothleaf
  Streptanthus arizonicus S. Watson – not accepted
  Streptanthus barbatus S. Watson – accepted – Pacific jewelflower
  Streptanthus campestris S. Watson – accepted – southern jewelflower
  Streptanthus diversifolius S. Watson – accepted – variableleaf jewelflower, variedleaf twistflower
  Streptanthus howellii S. Watson – accepted – Howell's jewelflower
  Streptanthus lemmonii S. Watson – accepted – Lemmon's jewelflower
  Suaeda californica S. Watson – accepted – California seablite
  Suaeda californica var. californica S. Watson – not accepted – California seablite
  Suaeda depressa var. erecta S. Watson – not accepted
  Suaeda intermedia S. Watson – not accepted
  Suaeda minutiflora S. Watson – not accepted
  Suaeda suffrutescens S. Watson – not accepted – desert seepweed
  Suaeda suffrutescens var. suffrutescens S. Watson – not accepted – desert seepweed
  Suaeda torreyana S. Watson – not accepted
  Sullivantia gregana S. Watson – not accepted
  Sullivantia oregana S. Watson – accepted – Oregon coolwort
  Synthyris pinnatifida S. Watson – accepted – featherleaf kittentails
  Synthyris pinnatifida var. pinnatifida S. Watson – not accepted – featherleaf kittentails
  Talinum brevicaule S. Watson – not accepted – dwarf fameflower
  Tephrosia affinis S. Watson – not accepted
  Tephrosia constricta S. Watson – not accepted
  Thelypodium ambiguum S. Watson – not accepted
  Thelypodium cooperi S. Watson – not accepted
  Thelypodium howellii S. Watson – accepted – Howell's thelypody
  Thelypodium howellii ssp. howellii S. Watson – accepted – Howell's thelypody
  Thelypodium stenopetalum S. Watson – accepted – slender-petaled mustard, slenderpetal thelypody
  Thermopsis californica S. Watson – accepted – California goldenbanner
  Thermopsis californica var. californica S. Watson – accepted – California goldenbanner
  Thlaspi californicum S. Watson – not accepted – Kneeland Prairie pennycress
  Thysanocarpus erectus S. Watson – accepted
  Tillaea angustifolia var. bolanderi S. Watson – not accepted
  Tillaea minima var. subsimplex S. Watson – not accepted
  Tillaea viridis S. Watson – not accepted
  Tofieldia occidentalis S. Watson – not accepted
  Trifolium brandegeei S. Watson – accepted – Brandegee's clover
  Trifolium breweri S. Watson – accepted – forest clover
  Trifolium catalinae S. Watson – not accepted
  Trifolium howellii S. Watson – accepted – canyon clover
  Trifolium kingii S. Watson – accepted – King's clover
  Trifolium kingii ssp. kingii S. Watson – accepted – King's clover
  Trifolium lemmonii S. Watson – accepted – Lemmon's clover
  Trifolium longipes var. brachypus S. Watson – not accepted
  Trifolium palmeri S. Watson – not accepted
  Trifolium plummerae S. Watson – not accepted
  Trillium rivale S. Watson – not accepted – brook wakerobin
  Triodia schaffneri S. Watson – not accepted
  Triodia texana S. Watson – not accepted
  Urtica breweri S. Watson – not accepted
  Urtica dioica var. occidentalis S. Watson – not accepted
  Urtica lyallii S. Watson – not accepted
  Valeriana dioica var. sylvatica S. Watson – accepted – woods valerian, woods valeriana
  Vicia floridana S. Watson – accepted – Florida vetch
  Vicia hassei S. Watson – accepted – Hasse's vetch, slender vetch
  Vicia reverchonii S. Watson – not accepted – hairy pod vetch
  Viguiera reticulata S. Watson – not accepted – netvein goldeneye, Death Valley goldeneye
  Viola cuneata S. Watson – accepted – wedgeleaf violet
  Viola lobata var. integrifolia S. Watson – accepted – pine violet
  Viola oxyceras S. Watson – not accepted
  Washingtonia sonorae S. Watson – not accepted
  Zea canina S. Watson – not accepted
  Zephyranthes treatiae S. Watson – accepted
  Zigadenus venenosus S. Watson – not accepted – death camas, meadow deathcamas
  Zigadenus venenosus var. venenosus S. Watson – not accepted – meadow deathcamas
  Zostera pacifica S. Watson – not accepted – Pacific zostera
   

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