My sources for all the plants on my Washington Natives list are:

1. Lady Bird Johnson Wildflower Center
2. Central Washington Native Plants
3. UW Herbarium at the Burke
4. Garden Guide
5. Washington Native Plant Society
6. USDA Plants Database

• Sagina decumbens - trailing pearlwort, western pearlwort
• Sagina saginoides - Arctic pearlwort
• Sagittaria cuneata syn Sagittaria arifolia - Arumleaf arrowhead, Narrowleaf Arrowhead
• Sagittaria latifolia syn Sagittaria engelmanniana ssp. longirostra, Sagittaria esculenta, Sagittaria latifolia var. obtusa, Sagittaria latifolia var. pubescens, Sagittaria longirostra, Sagittaria obtusa, Sagittaria ornithorhyncha, Sagittaria planipes, Sagittaria pubescens, Sagittaria variabilis var. obtusa, Sagittaria viscosa - Arrowhead, Broadleaf arrowhead, Duck-potato, Wapato
• Salicornia depressa syn Salicornia europaea, Salicornia europaea var. pachystachya, Salicornia europaea var. simplex, Salicornia maritima, Salicornia virginica - American Glasswort, Virginia glasswort, perennial glasswort, Pickleweed
• Salicornia rubra syn Salicornia europaea ssp. rubra, Salicornia europaea var. prona - Red swampfire, red saltwort
• Salix amygdaloides syn Salix amygdaloides var. wrightii, Salix nigra var. amygdaloides, Salix nigra var. wrightii, Salix wrightii - Peachleaf willow
• Salix arctica syn Salix anglorum, Salix anglorum var. antiplasta, Salix anglorum var. araioclada, Salix anglorum var. kophophylla, Salix arctica ssp. crassijulis, Salix arctica ssp. tortulosa, Salix arctica var. antiplasta, Salix arctica var. araioclada, Salix arctica var. brownei, Salix arctica var. kophophylla, Salix arctica var. pallasii, Salix arctica var. tortulosa, Salix browne, Salix crassijulis, Salix hudsonensis, Salix pallasii, Salix pallasii var. crassijulis, Salix tortulosa - Arctic willow
• Salix barclayi syn Salix barclayi var. angustifolia, Salix barclayi var. conjuncta, Salix conjuncta, Salix hoyeriana, Salix pyrolifolia var. hoyeriana, Salix regelii - Barclay's willow
• Salix bebbiana syn Salix bebbiana var. bebbiana, Salix bebbiana var. capreifolia, Salix bebbiana var. depilis, Salix bebbiana var. luxurians, Salix bebbiana var. perrostrata, Salix bebbiana var. projecta, Salix depressa ssp. rostrata, Salix livida var. occidentalis, Salix livida var. rostrata, Salix perrostrata, Salix rostrata, Salix rostrata var. capreifolia, Salix rostrata var. luxurians, Salix rostrata var. perrostrata, Salix rostrata var. projecta, Salix starkeana ssp. bebbiana, Salix vagans var. occidentalis, Salix vagans var. rostrata - Bebb willow, Gray willow, Long-beaked willow
• Salix boothii syn Salix curtiflora, Salix myrtillifolia, Salix myrtillifolia var. curtiflora, Salix novae-angliae, Salix pseudocordata, Salix pseudocordata var. aequalis, Salix pseudomyrsinites, Salix pseudomyrsinites var. aequalis - Booth's willow
• Salix brachycarpa syn Salix brachycarpa ssp. brachycarpa - Shortfruit willow
• Salix candida syn Salix candida var. denudata, Salix candida var. tomentosa, Salix candidula - Hoary willow, Sage willow, Sageleaf willow
• Salix cascadensis syn Salix brownii var. tenera, Salix cascadensis var. thompsonii, Salix tenera - cascade willow
• Salix commutata syn Salix barclayi var. commutata, Salix commutata var. denudata, Salix commutata var. mixta, Salix commutata var. puberula, Salix commutata var. sericea - Undergreen willow, variable willow
• Salix drummondiana syn Salix bella, Salix covillei, Salix drummondiana ssp. subcaerulea, Salix drummondiana var. bella, Salix drummondiana var. subcaerulea, Salix pachnophora, Salix subcaerulea - Drummond's willow
• Salix exigua syn Salix argophylla, Salix exigua ssp. exigua, Salix exigua ssp. exigua var. exigua, Salix exigua ssp. interior, Salix exigua var. angustissima, Salix exigua var. columbiana, Salix exigua var. hindsiana, Salix exigua var. luteosericea, Salix exigua var. nevadensis, Salix exigua var. parishiana, Salix exigua var. stenophylla, Salix exigua var. virens, Salix fluviatilis var. argophylla, Salix hindsiana, Salix hindsiana var. leucodendroides, Salix hindsiana var. parishiana, Salix hindsiana var. tenuifolia, Salix interior var. angustissima, Salix interior var. luteosericea, Salix linearifolia, Salix longifolia var. argophylla, Salix longifolia var. exigua, Salix longifolia var. opaca, Salix luteosericea, Salix macrostachya var. leucodendroides, Salix malacophylla, Salix nevadensis, Salix parishiana, Salix sessilifolia var. hindsiana, Salix sessilifolia var. leucodendroides, Salix stenophylla, Salix thurberi - Coyote willow, Narrowleaf willow, Sandbar willow
• Salix farriae syn Salix farriae var. microserrulata, Salix hastata var. farriae - Farr's willow
• Salix geyeriana syn Salix geyeriana ssp. argentea, Salix geyeriana var. argentea, Salix geyeriana var. geyeriana, Salix geyeriana var. meleiana, Salix geyeriana var. meleina, Salix macrocarpa, Salix macrocarpa var. argentea, Salix meleina - Geyer willow
• Salix glauca - Grayleaf willow
• Salix hookeriana syn Salix amplifolia, Salix hookeriana var. laurifolia, Salix hookeriana var. tomentosa, Salix piperi - Dune willow, Hooker Willow, coastal willow
• Salix lasiolepis - Arroyo willow
• Salix lemmonii syn Salix austinae, Salix lemmonii var. austinae, Salix lemmonii var. macrostachya, Salix lemmonii var. melanopsis, Salix lemmonii var. sphaerostachya - Lemmon's willow
• Salix lucida - Shining willow, gland willow, Pacific willow
• Salix lucida ssp. lasiandra syn Salix arguta, Salix arguta var. erythrocoma, Salix arguta var. lasiandra, Salix lancifolia, Salix lasiandra, Salix lasiandra var. abramsii, Salix lasiandra var. lancifolia, Salix lasiandra var. lyallii, Salix lasiandra var. macrophylla, Salix lasiandra var. recomponens, Salix lucida var. macrophylla, Salix lyallii, Salix speciosa - Pacific willow, shining willow
• Salix maccalliana - McCalla's willow
• Salix melanopsis syn Salix bolanderiana, Salix exigua ssp. melanopsis, Salix exigua var. gracilipes, Salix exigua var. tenerrima, Salix fluviatilis var. tenerrima, Salix longifolia var. tenerrima, Salix melanopsis var. bolanderiana, Salix melanopsis var. gracilipes, Salix melanopsis var. kronkheittii, Salix melanopsis var. tenerrima, Salix parksiana, Salix sessilifolia var. vancouverensis, Salix tenerrima - dusky willow, Columbia river willow
• Salix nivalis syn Salix nivalis var. nivalis, Salix nivalis var. saximontana, Salix reticulata ssp. nivalis, Salix reticulata var. nana, Salix reticulata var. nivalis, Salix reticulata var. saximontana, Salix saximontana, Salix venusta, Salix vestita var. nana - snow willow, swarf willow
• Salix pedicellaris syn Salix fuscescens var. hebecarpa, Salix hebecarpa, Salix myrtilloides var. hypoglauca, Salix myrtilloides var. pedicellaris, Salix pedicellaris var. hypoglauca, Salix pedicellaris var. tenuescens - Bog willow
• Salix petrophila syn Salix arctica ssp. petraea, Salix arctica var. caespitosa, Salix arctica var. graminifolia, Salix arctica var. petraea, Salix arctica var. petrophila, Salix brownei var. petraea, Salix caespitosa, Salix petrophila var. caespitosa - alpine willow
• Salix planifolia - Diamondleaf willow, tea-leaved willow, plane-leaf willow
• Salix prolixa syn Salix cordata var. mackenzieana, Salix eriocephala ssp. mackenzieana, Salix eriocephala var. mackenzieana, Salix mackenzieana, Salix mackenzieana var. macrogemma, Salix rigida ssp. mackenzieana, Salix rigida var. mackenzieana, Salix rigida var. macrogemma- MacKenzie's willow
• Salix pseudomonticola syn Salix barclayi var. pseudomonticola, Salix monticola - False mountain willow
• Salix scouleriana syn Salix brachystachys, Salix brachystachys var. scouleriana, Salix capreoides, Salix flavescens, Salix flavescens var. capreoides, Salix flavescens var. scouleriana, Salix nuttallii, Salix nuttallii var. capreoides, Salix scouleriana var. brachystachys, Salix scouleriana var. coetanea, Salix scouleriana var. crassijulis, Salix scouleriana var. flavescens, Salix scouleriana var. poikila, Salix scouleriana var. thompsonii, Salix stagnalis - Scouler's willow, Western pussy willow
• Salix sessilifolia - Northwest sandbar willow, Northwest Willow, River Willow
• Salix sitchensis syn Salix coulteri, Salix cuneata, Salix sitchensis var. congesta, Salix sitchensis var. denudata, Salix sitchensis var. parviflora, Salix sitchensis var. ralphiana - Sitka willow
• Salix tweedyi syn Salix barrattiana var. tweedyi, Salix rotundifolia - Tweedy's willow
• Salix vestita syn Salix fernaldii, Salix leiolepis, Salix reticulata var. vestita, Salix vestita ssp. leiolepis, Salix vestita var. erecta, Salix vestita var. humilior, Salix vestita var. psilophylla - Rock willow
• Salvia dorrii - Gray ball sage, Purple sage
• Sambucus racemosa syn Sambucus buergeriana, Sambucus racemosa subsp. sieboldiana forma stenophylla, Sambucus callicarpa, Sambucus racemosa subsp. pubens var. arborescens, Sambucus coreana, Sambucus kamtschatica, Sambucus melanocarpa, Sambucus racemosa subsp. pubens var. melanocarpa, Sambucus microbotrys, Sambucus racemosa subsp. pubens var. microbotrys, Sambucus pubens, Sambucus pubens var. arborescens, Sambucus racemosa subsp. pubens var. arborescens, Sambucus pubens f. xanthocarpa, Sambucus pubescens, Sambucus racemosa subsp. pubens, Sambucus racemosa var. laciniata, Sambucus racemosa var. miquelii, Sambucus racemosa var. sieboldiana, Sambucus racemosa f. xanthocarpa, Sambucus racemosa subsp. pubens, Sambucus sibirica, Sambucus racemosa subsp. sibirica, Sambucus sieboldiana, Sambucus racemosa subsp. sieboldiana, Sambucus sieboldiana var. miquelii, Sambucus racemosa subsp. kamtschatica, Sambucus sieboldiana var. stenophylla, Sambucus racemosa subsp. sieboldiana forma stenophylla, Sambucus sieboldiana f. xanthocarpa, Sambucus sieboldiana var. xanthocarpa, Sambucus racemosa subsp. sieboldiana forma nakaiana, Sambucus tigranii, Sambucus racemosa subsp. racemosa - Black Elderberry, Blackbead Elder, Blackfruit Elderberry, Bore Tree, Boutry, Bunchberry Elder, Mountain Elder, Pacific Red Elderberry, Red Elder, Red Elderberry, Redberried Elder, Red-berried elderberry, Scarlet Elder, Stinking Elder, Stinking Elderberry, Sureau rouge
• Sambucus racemosa var. melanocarpa syn Sambucus melanocarpa - Black Elderberry, Rocky Mountain elder
• Samolus valerandi - Seaside brookweed, water pimpernel
• Sanguisorba annua syn Poteridium annuum, Sanguisorba occidentalis - annual burnet
• Sanguisorba canadensis syn Sanguisorba canadensis ssp. latifolia, Sanguisorba canadensis var. latifolia, Sanguisorba sitchensis, Sanguisorba stipulata - Canadian burnet, Sitka burnet
• Sanicula arctopoides syn Sanicula crassicaulis var. howellii, Sanicula ×howellii - Footsteps of spring, bear's-foot sanicle
• Sanicula bipinnatifida syn Sanicula bipinnatifida var. flava - Purple sanicle, purple black-snakeroot
• Sanicula crassicaulis - Gambleweed, Pacific sanicle, Pacific Snakeroot, Snakeroot
• Sanicula graveolens syn Sanicula graveolens var. septentrionalis, Sanicula nevadensis, Sanicula nevadensis var. septentrionalis, Sanicula septentrionalis - northern sanicle, Sierran black-snakeroot
• Sanicula marilandica syn Sanicula marilandica var. petiolulata - Maryland sanicle
• Sarcobatus vermiculatus syn Sarcobatus baileyi, Sarcobatus vermiculatus var. baileyi - Greasewood
• Sarcocornia pacifica syn Salicornia pacifica - American Glasswort, Pacific glasswort, Pacific swampfire, Perennial Glasswort, Pickleweed, Poor man's asparagus, Pousse-pied, Salicornia, Samphire, Sea asparagus, Sea bean, Virginia Glasswort, Woody Glasswort
• Saussurea americana - American saw-wort
• Saxifraga bronchialis - yellowdot saxifrage, spotted saxifrage, Matted saxifrage, Yellow-spot saxifrage, Yellowdot saxifrage
• Saxifraga caespitosa - Tufted alpine saxifrage
• Saxifraga ferruginea - Alaska Saxifrage, russethair saxifrage, Rusty Saxifrage
• Saxifraga idahoensis syn Saxifraga marshallii ssp. idahoensis, Saxifraga marshallii var. idahoensis, Saxifraga occidentalis var. idahoensis - Idaho Saxifrage
• Saxifraga integrifolia syn Micranthes bidens, Saxifraga bracteosa, Saxifraga bracteosa var. angustifolia, Saxifraga fragosa var. leucandra, Saxifraga integrifolia var. integrifolia, Saxifraga laevicarpa - Wholeleaf saxifrage
• Saxifraga lyallii - red-stemmed saxifrage, Lyall's saxifrage
• Saxifraga mertensiana syn Saxifraga mertensiana var. eastwoodiae - Wood saxifrage, woodland saxifrage, Merten's saxifrage
• Saxifraga nelsoniana - heartleaf saxifrage, dotted saxifrage, Nelson's saxifrage
• Saxifraga nidifica - peak Saxifrage
• Saxifraga occidentalis syn Micranthes lata, Micranthes occidentalis, Micranthes saximontana, Saxifraga occidentalis var. allenii, Saxifraga occidentalis var. occidentalis, Saxifraga occidentalis var. wallowensis, Saxifraga reflexa ssp. occidentalis - Alberta saxifrage, Western Saxifrage, mountain saxifrage
• Saxifraga odontoloma syn Micranthes odontoloma, Saxifraga aestivalisn Saxifraga arguta, Saxifraga punctata ssp. arguta, Saxifraga punctata var. arguta - Brook saxifrage, streambank saxifrage
• Saxifraga oppositifolia - Purple mountain saxifrage, purple saxifrage, twinflowered saxifrage
• Saxifraga oregana syn Micranthes arnoglossa, Micranthes brachypus, Micranthes oregana, Saxifraga montanensis, Saxifraga oregana var. montanensis, Saxifraga oregana var. sierrae - Oregon saxifrage
• Saxifraga rivularis syn Saxifraga debilis, Saxifraga hyperborea ssp. debilis, Saxifraga rivularis ssp. flexuosa, Saxifraga rivularis var. debilis, Saxifraga rivularis L. v. flexuosa - pygmy saxifrage, weak saxifrage, alpine-brook saxifrage
• Saxifraga rufidula syn Saxifraga aequidentata, Saxifraga klickitatensis, Saxifraga occidentalis ssp. rufidula, Saxifraga occidentalis var. aequidentata, Saxifraga occidentalis var. rufidula - rusty-hair saxifrage
• Saxifraga tolmiei syn Saxifraga tolmiei var. ledifolia, Saxifraga tolmiei var. tolmiei - Alpine saxifrage, Tolmie's saxifrage
• Saxifragopsis fragarioides syn Saxifraga fragarioides - strawberry saxifrage
• Scheuchzeria palustris - Rannoch-rush, scheuchzeria
• Schoenoplectus acutus - Hardstem bulrush, Tule, viscous bulrush
• Schoenoplectus americanus syn Scirpus americanus, Scirpus chilensis, Scirpus conglomeratus, Scirpus olneyi, Scirpus pungens var. longisetus - Chairmaker's bulrush, American three square, chairmaker's clubrush
• Schoenoplectus fluviatilis syn Bolboschoenus fluviatilis, Bolboschoenus maritimus ssp. fluviatilis, Scirpus fluviatilis - River bulrush
• Schoenoplectus maritimus syn Bolboschoenus maritimus, Bolboschoenus maritimus ssp. paludosus, Bolboschoenus maritimus var. paludosus, Bolboschoenus paludosus, Scirpus fernaldii, Scirpus maritimus, Scirpus maritimus var. fernaldii, Scirpus maritimus var. paludosus, Scirpus pacificus, Scirpus paludosus, Scirpus paludosus var. atlanticus - Alkali bulrush, Bayonet grass, Cosmopolitan bulrush, Prairie bulrush, Saltmarsh club-rush, saltmarsh bulrush, seaside bulrush
• Schoenoplectus pungens - common bulrush, common threesquare
• Schoenoplectus subterminalis syn Scirpus subterminalis - Swaying bulrush, water clubrush, swaying clubrush
• Schoenoplectus tabernaemontani syn Schoenoplectus lacustris ssp. creber, Schoenoplectus lacustris ssp. tabernaemontani, Schoenoplectus lacustris ssp. validus, Schoenoplectus validus, Schoenoplectus validus ssp. creber, Schoenoplectus validus ssp. luxurians, Scirpus lacustris ssp. creber, Scirpus lacustris ssp. glaucus, Scirpus lacustris ssp. tabernaemontani, Scirpus lacustris ssp. validus, Scirpus tabernaemontani, Scirpus validus, Scirpus validus var. creber - Great bulrush, Soft-stem club-rush, Softstem bulrush
• Scirpus atrovirens - Dark-green bulrush, Green bulrush
• Scirpus cyperinus syn Scirpus cyperinus var. condensatus, Scirpus cyperinus var. eriophorum, Scirpus cyperinus var. laxus, Scirpus cyperinus var. pelius, Scirpus cyperinus var. rubricosus, Scirpus eriophorum, Scirpus rubricosus - Cottongrass bulrush, Wool grass, brown woolly sedge
• Scirpus microcarpus syn Scirpus microcarpus var. longispicatus, Scirpus microcarpus var. rubrotinctus, Scirpus rubrotinctus - Panicled bulrush, small fruited bulrush
• Scirpus pallidus syn Scirpus atrovirens var. pallidus - cloaked bulrush, pale bulrush
• Scrophularia lanceolata syn Scrophularia pectinata - Lanceleaf figwort
• Scrophularia oregana syn Scrophularia californica, Scrophularia californica var. oregana - Oregon figwort
• Scutellaria angustifolia - Narrowleaf skullcap
• Scutellaria antirrhinoides - nose skullcap, snapdragon skullcap
• Scutellaria galericulata syn Scutellaria epilobiifolia, Scutellaria galericulata ssp. pubescens, Scutellaria galericulata var. epilobiifolia, Scutellaria galericulata var. pubescens - Marsh skullcap, Hooded skullcap
• Scutellaria lateriflora - Blue skullcap, mad-dog skullcap, madweed
• Sedum divergens syn Amerosedum divergens - Pacific stonecrop, spreading stonecrop
• Sedum lanceolatum - Lanceleaf Stonecrop, Spearleaf stonecrop
• Sedum leibergii syn Amerosedum leibergii, Sedum borschii, Sedum divericatum, Sedum leibergii var. typicum - Leiberg stonecrop
• Sedum oreganum - Oregon stonecrop
• Sedum rupicola syn Amerosedum rupicola, Sedum lanceolatum var. rupicola, Sedum lanceolatum var. rupicolum - curvedleaf stonecrop, lance-leaved stonecrop
• Sedum spathulifolium syn Sedum anomalum, Gormania anomalum - Broadleaf stonecrop, Colorado stonecrop, Pacific Broadleaf Stonecrop, Pacific Stonecrop, Common stonecrop
• Sedum stenopetalum - Wormleaf stonecrop
• Selaginella densa - lesser spikemoss, Rocky Mountain or cliff spikemoss
• Selaginella douglasii - Douglas' spikemoss, lesser clubmoss
• Selaginella oregana - Oregon spikemoss, festoon spikemoss
• Selaginella wallacei - Wallace's selaginella
• Senecio elmeri syn Senecio crepidineus - Elmer's ragwort
• Senecio fremontii - Dwarf mountain ragwort, dwarf mountain groundsel
• Senecio hydrophiloides syn Senecio foetidus, Senecio foetidus var. foetidus , Senecio foetidus var. hydrophiloides, Senecio pereziifolius - Tall groundsel, sweet marsh butterweed, stout meadow groundsel
• Senecio hydrophilus syn Senecio sandvicensis - water ragwort, alkali marsh butterweed, water groundsel, alkali marsh ragwort
• Senecio integerrimus - Lambstongue ragwort, tall western groundsel, lambstongue groundsel
• Senecio lugens syn Senecio integerrimus var. lugens - Small blacktip ragwort, black-tipped groundsel
• Senecio neowebsteri syn Ligularia websteri, Senecio websteri - Olympic Mountain ragwort
• Senecio serra - Tall ragwort, butterweed groundsel, tall butterweed
• Senecio triangularis syn Senecio gibbsonsii, Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis - Arrowleaf Groundsel, Arrowleaf ragwort
• Sericocarpus rigidus syn Aster curtus - Columbian whitetop aster, rigid white-topped aster
• Shepherdia canadensis syn Elaeagnus canadensis, Lepargyrea canadensis - Russet buffalo-berry, soopolallie, soapberry
• Sibbaldia procumbens syn Potentilla sibbaldii - Creeping sibbaldia
• Sidalcea campestris - Meadow checkerbloom
• Sidalcea hendersonii - Henderson's checkerbloom, Henderson's checker-mallow
• Sidalcea hirtipes - Bristlystem checkerbloom
• Sidalcea malviflora - Checkerbloom, Dwarf checker-mallow, Dwarf checkerbloom
• Sidalcea malviflora ssp. virgata syn Sidalcea malviflora var. virgata, Sidalcea virgata - dwarf checkerbloom
• Sidalcea nelsoniana - Nelson's checker-mallow
• Sidalcea oregana - Oregon checkerbloom, Oregon checker-mallow
• Silene acaulis - Cushion-pink, Moss campion
• Silene douglasii - Douglas pink, Seabluff catchfly
• Silene menziesii - Menzies' campion
• Silene parryi syn Silene douglasii var. macounii, Silene macounii, Silene scouleri var. macounii, Silene tetonensis, Wahlbergella parryi - Parry's Silene
• Silene scouleri - Bluff pink, Simple campion, Simple catchfly
• Silene seelyi syn Anotites seelyi - Seely's catchfly, Seely's silene
• Silene spaldingii - Spalding's silene
• Silene suksdorfii - Suksdorf's silene, Cascade catchfly
• Sisyrinchium californicum syn Hydastylus borealis, Hydastylus brachypus, Hydastylus californicus, Sisyrinchium boreale - Golden-eyed grass, golden blue-eyed grass
• Sisyrinchium idahoense - Idaho blue-eyed grass
• Sisyrinchium littorale - Alaska blue-eyed grass
• Sisyrinchium sarmentosum - mountain blue-eyed grass, pale or Suksdorf's blue-eyed grass
• Sisyrinchium septentrionale - northern blue-eyed grass
• Sium suave syn Sium cicutifolium, Sium floridanum, Sium suave var. floridanum - Hemlock waterparsnip, Water Parsnip
• Smelowskia calycina - Alpine smelowskia, Western Smelowskia, Siberian smelowskia
• Smelowskia ovalis - alpine false candytuft, short-fruited smelowskia
• Solanum triflorum - cut-leaf nightshade
• Solidago canadensis syn Solidago altissima, Solidago lepida, Solidago pruinosa, Solidago longifolia - Giant goldenrod, Canada goldenrod, Canadian goldenrod, Common golden-rod, Hairy Canada goldenrod, Gerbe d'or, Meadow Goldenrod, Tall goldenrod, Kanadagullris, Kanadanpiisku, Kanadensiskt gullris, Kanadische Goldrute, Verge d'or du Canada
• Solidago gigantea syn Aster latissimifolius var. serotinus, Solidago gigantea ssp. serotina, Solidago gigantea var. leiophylla, Solidago gigantea var. pitcheri, Solidago gigantea var. serotina Solidago gigantea var. shinnersii, Solidago ×leiophallax, Solidago pitcheri, Solidago serotina, Solidago serotinoides - Giant goldenrod
• Solidago missouriensis - Missouri goldenrod, Prairie goldenrod
• Solidago multiradiata - Northern goldenrod, Rocky Mountain goldenrod
• Solidago simplex - Mt. Albert goldenrod, Narrow Goldenrod
• Solidago simplex ssp. simplex var. nana syn Solidago bellidifolia, Solidago decumbens, Solidago decumbens var. oreophila, Solidago glutinosa var. nana, Solidago oreophila, Solidago spathulata var. nana - Dwarf goldenrod
• Sonchus arvensis - field sowthistle
• Sorbus scopulina - Cascade mountain-ash, Greene's mountain ash, Western mountain-ash
• Sorbus sitchensis - Sitka mountain-ash, Western mountain ash
• Sparganium angustifolium syn Sparganium acaule, Sparganium chlorocarpum var. acaule, Sparganium emersum, Sparganium emersum var. angustifolium, Sparganium emersum var. emersum, Sparganium emersum var. multipedunculatum, Sparganium multipedunculatum - Narrowleaf bur-reed
• Sparganium eurycarpum syn Sparganium californicum, Sparganium eurycarpum var. greenei, Sparganium greenei - Broadfruit bur-reed, Giant Bur-reed
• Sparganium fluctuans syn Sparganium androcladum - Floating bur-reed
• Sparganium natans syn Sparganium minimum, Sparganium minimum, Sparganium natans var. minimum - Small bur-reed, lesser bur-reed
• Spartina patens syn Spartina patens var. juncea, Spartina patens var. monogyna - Marsh-hay cord grass, Saltmeadow cordgrass
• Spartina pectinata syn Spartina michauxiana, Spartina pectinata var. suttiei - Freshwater cord grass, Prairie cordgrass
• Spergularia canadensis - Canadian sandspurry
• Spergularia marina syn Spergularia alata, Spergularia leiosperma, Spergularia marina, Spergularia marina var. leiosperma, Spergularia marina var. simonii, Spergularia marina var. tenuis, Spergularia salina var. tenuis, Spergularia sparsiflora, Spergularia tenuis var. involucrata, Tissa marina, Tissa tenuis - Saltmarsh sandspurry
• Sphaeralcea grossulariifolia - Current-leaf globe-mallow, Gooseberry-leaf globe-mallow
• Sphaeralcea munroana - Orange Globemallow, Munro's globemallow, White-stem globe-mallow
• Sphenopholis intermedia syn Sphenopholis intermedia var. pilosa, Sphenopholis obtusata var. major - Slender wedgescale
• Sphenopholis obtusata syn Aira obtusata, Sphenopholis obtusata var. lobata, Sphenopholis obtusata var. pubescens - Prairie wedgescale, blunt sphenopholis
• Spiraea betulifolia - White spirea
• Spiraea douglasii - rose spirea
• Spiraea splendens - Rose meadowsweet, Subalpine Spiraea
• Spiraea ×pyramidata - hybrid spiraea
• Spiranthes diluvialis syn Spiranthes romanzoffiana var. diluvialis - diluvim ladies'-tresses
• Spiranthes romanzoffiana syn Ibidium strictum, Spiranthes romanzoffiana var. romanzoffiana, Spiranthes stricta - Hooded lady's tresses
• Sporobolus airoides syn Agrostis airoides - Alkali sacaton
• Sporobolus compositus - Composite dropseed, longleaf dropseed, dropseed, rough dropseed
• Sporobolus compositus var. compositus - Composite dropseed, Tall dropseed
• Sporobolus cryptandrus syn Agrostis cryptandra, Sporobolus cryptandrus ssp. fuscicola, Sporobolus cryptandrus var. fuscicola, Sporobolus cryptandrus var. occidentalis - sand dropseed
• Stachys chamissonis - Coastal hedgenettle, Cooley's hedge-nettle
• Stachys chamissonis var. cooleyae syn Stachys ciliata, Stachys cooleyae - Coastal hedgenettle, Great Hedge-nettle, Cooley's hedge-nettle
• Stachys pilosa - Hairy hedgenettle
• Stachys pilosa var. pilosa syn Stachys asperrima, Stachys borealis, Stachys homotricha, Stachys palustris ssp. pilosa, Stachys palustris var. homotricha, Stachys palustris var. nipigonensis, Stachys palustris var. phaneropoda, Stachys palustris var. pilosa, Stachys palustris var. puberula, Stachys scopulorum, Stachys teucriifolia, Stachys teucriiformis - Hairy hedgenettle
• Stellaria alsine syn Alsine uliginosa, Stellaria uliginosa - Bog chickweed
• Stellaria borealis - Boreal starwort, northern stitchwort
• Stellaria calycantha syn Alsine calycantha, Alsine simcoei, Stellaria borealis var. simcoei, Stellaria calycantha var. simcoei, Stellaria simcoei - Northern starwort
• Stellaria humifusa syn Alsine humifusa, Stellaria humifusa var. oblongifolia, Stellaria humifusa var. suberecta - Saltmarsh starwort
• Stellaria longifolia - Longleaf starwort, longleaf stitchwort
• Stellaria longipes syn Alsine longipes, Alsine palmeri, Alsine stricta, Alsine validus , Stellaria dulcis, Stellaria edwardsii, Stellaria edwardsii var. arctica, Stellaria Hultenii, Stellaria laeta, Stellaria laeta var. altocaulis, Stellaria laxmannii, Stellaria longifolia var. laeta, Stellaria longipes ssp. monantha, Stellaria longipes ssp. stricta, Stellaria longipes var. altocaulis, Stellaria longipes var. edwardsii, Stellaria longipes var. laeta, Stellaria longipes var. longipes, Stellaria longipes var. monantha, Stellaria longipes var. subvestita, Stellaria monantha, Stellaria monantha ssp. atlantica, Stellaria monantha var. altocaulis, Stellaria monantha var. atlantica, Stellaria palmeri, Stellaria stricta, Stellaria subvestita, Stellaria valida - Longstalk starwort
• Stellaria nitens syn Stellaria praecox - Shining chickweed
• Stenanthium occidentale syn Stenanthella occidentalis - Western featherbells, Western Stenanthium, mission bells, bronze bells
• Stenotus lanuginosus syn Haplopappus lanuginosus, Haplopappus lanuginosus ssp. andersonii, Haplopappus lanuginosus ssp. typicus, Haplopappus lanuginosus var. andersonii, Stenotus andersonii, Stenotus lanuginosus var. andersonii, Stenotus lanuginosus var. lanuginosus - Wooly Mock goldenweed Goldenweed, Anderson's mock goldenweed
• Stenotus stenophyllus syn Haplopappus stenophyllus - Narrowleaf Goldenweed, Narrowleaf mock goldenweed
• Stephanomeria minor - Narrowleaf wirelettuce, lesser wirelettuce, narrow-leaf stephanomeria, wire lettuce
• Stephanomeria minor var. minor syn Stephanomeria tenuifolia - Skeletonweed
• Stephanomeria paniculata - tufted wirelettuce, stiff branched wirelettuce, stiff branched stephanomeria
• Streptopus amplexifolius - Claspleaf twistedstalk
• Streptanthella longirostris syn Streptanthella longirostris var. derelicta - longbeak streptanthella, streptanthella, long-beaked fiddle mustard
• Streptopus amplexifolius - clasp-leaf twisted-stalk, clasping twisted-stalk
• Streptopus lanceolatus - Rosy Twisted-stalk, Twistedstalk
• Stuckenia pectinata syn Coleogeton pectinatus, Potamogeton pectinatus - fennel-leaved pondweed, Sago pondweed
• Stuckenia vaginata syn Coleogeton vaginatus, Potamogeton interruptus, Potamogeton vaginatus, Stuckenia vaginatus - Sheathed pondweed
• Suaeda calceoliformis syn Dondia depressa, Schoberia occidentalis, Suaeda americana, Suaeda depressa, Suaeda depressa var. erecta, Suaeda maritima var. americana, Suaeda minutiflora, Suaeda occidentalis - Pursh seepweed, horned seablite, pahute weed, paiuteweed, common seablite
• Subularia aquatica - Waterawlwort, awlwort
• Suksdorfia ranunculifolia syn Boykinia ranunculifolia, Hemieva ranunculifolia - Buttercup-leaved Suksdorfia, buttercup suksdorfia, buttercup-leaf mock brookfoam
• Suksdorfia violacea - Violet suksdorfia, violet mock brookfoam
• Swertia perennis syn Swertia perennis var. obtusa - Felwort Star Gentian, felwort
• Symphoricarpos albus syn Symphoricarpos racemosus, Symphoricarpos rivularis, Symphoricarpos albus var. laevigatus, Symphoricarpos albus var. pauciflorus, Symphoricarpos pauciflorus, Symphoricarpos racemosus - Common snowberry, Corpse Berries, Snake Berry, Snowberry, Waxberry, White Coralberry, White Hedgei
• Symphoricarpos occidentalis - Western snowberry, Wolfberry
• Symphoricarpos oreophilus - Mountain snowberry
• Symphyotrichum ascendens syn Aster adscendens, Aster ascendens, Aster chilensis ssp. adscendens, Aster macounii, Aster subgriseus, Virgulaster ascendens - Pacific aster, Purple aster, Western American-aster, Western aster
• Symphyotrichum boreale syn Aster borealis, Aster franklinianus, Aster junceus, Aster junciformis, Aster laxifolius var. borealis - Northern bog aster, rush aster
• Symphyotrichum chilense - Common California Aster, Pacific aster
• Symphyotrichum ciliatum syn Aster brachyactis, Brachyactis angusta, Brachyactis ciliata, Brachyactis ciliata ssp. angusta, Tripolium angustum - Alkali American-aster, Rayless alkali aster, Rayless aster
• Symphyotrichum cusickii syn Aster cusickii, Aster foliaceus var. cusickii - Cusick's aster, Cusick's American aster
• Symphyotrichum eatonii syn Aster bracteolatus, Aster cordalenus, Aster eatonii, Aster foliaceus var. eatonii, Aster mearnsii, Aster oregonus, Symphyotrichum bracteolatum - Eaton's aster, Oregon aster
• Symphyotrichum ericoides - Heath Aster, White heath aster
• Symphyotrichum foliaceum - Alpine leafybract aster, Leafy Aster
• Symphyotrichum hallii syn Aster chilensis ssp. hallii, Aster hallii -Hall's aster
• Symphyotrichum jessicae syn Aster jessicae - Jessica's aster, Palouse aster
• Symphyotrichum laeve - Smooth blue aster, Steele's aster
• Symphyotrichum spathulatum - Western mountain aster
• Symphyotrichum subspicatum - Douglas aster
• Synthyris missurica - Mountain Kittentails, Tailed kittentails
• Synthyris pinnatifida - cut-leaf kittentails, feather-leaf kittentails
• Synthyris reniformis - round-leaved kittentails, Snow Queen
• Synthyris schizantha - fringepetal kittentails, fringe-petal kitten's-tail

• Talinum sediforme syn Talinum okanoganense - Okanogan fameflower
• Talinum spinescens - spiny fameflower, spinescent fameflower
• Tanacetum camphoratum syn Tanacetum douglasii - Camphor tansy, dune tansy
• Taraxacum lyratum syn Taraxacum kamtschaticum, Taraxacum scopulorum, Taraxacum sibiricum - Harp dandelion
• Tauschia stricklandii syn Hesperogenia stricklandii - Strickland's umbrella-wort, Strickland's tauschia
• Taxus brevifolia - Pacific yew, Western yew
• Tellima grandiflora syn Tellima odorata, Tellima breviflora - Bigflower tellima Fragrant fringecup, Fringecup
• Tetradymia canescens syn Tetradymia canescens var. inermis - Spineless horsebrush, gray horsebrush
• Teucrium canadense - American germander, Canada germander, Candad germander, Germander, Hairy germander, Wood sage
• Thalictrum dasycarpum syn Thalictrum dasycarpum var. hypoglaucum, Thalictrum hypoglaucum - Meadow rue, Purple meadow-rue, Tall meadow-rue
• Thalictrum occidentale - Western meadow-rue
• Thalictrum venulosum syn Thalictrum confine, Thalictrum confine var. columbianum, Thalictrum confine var. greeneanum, Thalictrum occidentale var. columbianum, Thalictrum turneri, Thalictrum venulosum var. confine, Thalictrum venulosum var. fissum, Thalictrum venulosum var. lunellii, Thalictrum venulosum var. turneri - Veiny meadow-rue, Boundary meadow-rue
• Thelypodium laciniatum syn Thelypodium laciniatum var. laciniatum, Thelypodium laciniatum var. streptanthoides, Thelypodium streptanthoides - cut-leaf thelypody, thick-leaved thelypody
• Thelypodium milleflorum syn Thelypodium laciniatum var. milleflorum - Manyflower Thelypody
• Thelypteris nevadensis syn Dryopteris nevadensis, Dryopteris oregana, Lastrea oregana - Sierra marsh fern
• Thelypteris quelpaertensis syn Dryopteris oreopteris, Lastrea limbosperma, Oreopteris limbosperma, Oreopteris quelpaertensis, Polypodium limbospermum, Thelypteris limbosperma - queen's-veil maiden fern, mountain fern
• Thermopsis gracilis - slender golden-banner, mountain thermopsis
• Thermopsis montana - Buckbean, Golden pea, Montane golden-banner, Mountain goldenbanner, Hitchcock's thermopsis
• Thlaspi montanum - Mountain Pennycress, alpine pennycress, wild candytuft
• Thuja plicata - Western arborvitae, Western red cedar, canoe cedar
• Thysanocarpus curvipes syn Thysanocarpus amplectens, Thysanocarpus curvipes var. elegans, Thysanocarpus curvipes var. eradiatus, Thysanocarpus curvipes var. longistylus, Thysanocarpus elegans - Sand fringepod, lacepod
• Tiarella trifoliata - Threeleaf foamflower, Western Foamflower, Coolwort, Foamflower, False Mitrewort, Laceflower
• Tolmiea menziesii syn Tiarella menziesii - Piggyback-plant, Thousand mothers, Youth on age
• Tonella floribunda - manyflower tonella, greater baby-innocence, large-flowered tonella
• Tonella tenella - small-flowered tonella, lesser baby-innocence
• Tonestus lyallii syn Haplopappus lyallii - Lyall's goldenweed, Lyall's serpentweed
• Torreyochloa pallida - Pale false mannagrass, weak alkaligrass
• Townsendia florifera
  syn Townsendia florifer,Townsendia florifera var. watsonii - showy Townsend daisy
• Toxicodendron diversilobum syn Rhus diversiloba, Toxicodendron radicans ssp. diversilobum - Pacific poison oak, Western Poison Oak
• Toxicodendron rydbergii syn Rhus radicans, Rhus radicans var. rydbergii, Rhus radicans var. vulgaris, Rhus toxicodendron var. vulgaris, Toxicodendron desertorum, Toxicodendron radicans var. rydbergii - Western poison ivy
• Tragopogon mirus - remarkable salsify, remarkable goatsbeard
• Trautvetteria caroliniensis - Carolina bugbane, False bugbane, wild bugbane
• Triantha occidentalis - sticky asphodel, sticky tofieldia
• Trichophorum caespitosum syn Baeothryon caespitosum, Baeothryon cespitosum, Scirpus caespitosus, Scirpus caespitosus var. austriacus, Scirpus caespitosus var. callosus, Scirpus caespitosus var. delicatulus, Scirpus cespitosus, Scirpus cespitosus var. austriacus, Scirpus cespitosus var. callosus, Scirpus cespitosus var. delicatulus, Trichophorum caespitosum var. callosum, Trichophorum cespitosum - Tufted bulrush, deer's hair sedge, tufted club-rush
• Trientalis borealis - Starflower, Western Starflower
• Trientalis borealis ssp. latifolia syn Trientalis europaea var. latifolia, Trientalis latifolia - Broad-leaved Starflower, Western Starflower, Indian Potato
• Trientalis europaea - arctic starflower, northern starflower
• Trifolium cyathiferum - cup clover, bowl clover
• Trifolium eriocephalum - woolly-head clover
• Trifolium fucatum syn Trifolium flavulum, Trifolium fucatum var. gambelii, Trifolium fucatum var. virescens, Trifolium gambelii - Bull clover
• Trifolium macrocephalum - Big-head Clover, Largehead clover
• Trifolium longipes - long-stalked clover
• Trifolium macrocephalum syn Lupinaster macrocephalus, Trifolium macrocephalum var. caeruleomontanum - large-head clover, big-head clover
• Trifolium microcephalum - Woolly clover, small-head clover
• Trifolium microdon syn Trifolium microdon var. pilosum - thimble clover, Valparaiso clover
• Trifolium oliganthum syn Trifolium pauciflorum, Trifolium variegatum var. pauciflorum - few-flowerered clover
• Trifolium thompsonii - Thompson's clover
• Trifolium variegatum syn Trifolium appendiculatum, Trifolium geminiflorum , Trifolium melananthum, Trifolium polyodon, Trifolium trilobatum, Trifolium variegatum var. major, Trifolium variegatum var. melananthum, Trifolium variegatum var. rostratum, Trifolium variegatum var. trilobatum - white-tip clover
• Trifolium willdenowii syn Trifolium tridentatum, Trifolium tridentatum var. aciculare, Trifolium willdenovii - Tomcat clover, springbank clover
• Trifolium wormskioldii syn Lupinaster wormskioldii, Trifolium fendleri, Trifolium fimbriatum, Trifolium heterodon, Trifolium involucratum var. fendleri, Trifolium involucratum var. fimbriatum, Trifolium involucratum var. heterodon, Trifolium involucratum var. kennedianum, Trifolium kennedianum, Trifolium spinulosum, Trifolium willdenowii var. fimbriatum, Trifolium willdenowii var. kennedianum, Trifolium wormskioldii var. fimbriatum, Trifolium wormskioldii var. kennedianum, Trifolium wormskjoldii - Cow Clover, salt marsh clover
• Triglochin maritima syn Triglochin concinna var. debilis, Triglochin debilis, Triglochin elata, Triglochin maritima var. elata, Triglochin maritimum - Seaside arrowgrass
• Triglochin palustris syn Triglochin palustre - Marsh arrowgrass, arrow-grass, small arrowgrass
• Trillium chloropetalum - giant trillium, Giant wakerobin, Wake robin
• Trillium ovatum - Coast trillium, Pacific trillium, Western wakerobin, wakerobin
• Trillium parviflorum - smallflower trillium, small-flowered wakerobin
• Trillium petiolatum - purple trillium, Idaho trillium, purple wakerobin
• Triodanis perfoliata syn Legousia perfoliata, Specularia perfoliata - Clasping Venus' looking-glass, clasping-leaf venus'-looking-glass
• Triphysaria pusilla syn Orthocarpus pusillus, Orthocarpus pusillus var. densiuscuus - Dwarf owl-clover
• Trisetum canescens syn Trisetum cernuum, Trisetum cernuum ssp. canescens, Trisetum cernuum var. canescens, Trisetum cernuum var. projectum, Trisetum spicatum var. projectum - Tall trisetum
• Triteleia grandiflora - Large-flower Tritelia, Douglas' brodiaea
• Triteleia grandiflora var. howellii syn Brodiaea douglasii var. howellii, Brodiaea howellii, Triteleia bicolor, Triteleia howellii - Howell's triteleia
• Triteleia hyacinthina syn Brodiaea dissimulata, Brodiaea hyacinthina, Brodiaea hyacinthina var. lactea, Hesperoscordum hyacinthinum - white triteleia, white brodiaea, fool's-onion
• Trollius laxus - American globeflower, western globeflower
• Tsuga heterophylla - Western hemlock, Pacific hemlock, lowland hemlock
• Tsuga mertensiana - Mountain hemlock, black hemlock
• Typha latifolia - Broadleaf cattail, Common cat-tail

• Urtica dioica - Stinging nettle NOTE: ssp. gracilis, holosericea are native; ssp. dioica is introduced
• Utricularia gibba syn Utricularia biflora, Utricularia fibrosa, Utricularia obtusa, Utricularia pumila - Bladderwort, Conespur bladderpod, Humped bladderwort, swollen-spurred bladderwort
• Utricularia intermedia - Flatleaf bladderwort, mountain bladderwort
• Utricularia macrorhiza syn Utricularia vulgaris, Utricularia vulgaris ssp. macrorhiza, Utricularia vulgaris var. americana - Common bladderwort, greater bladderwort
• Utricularia minor - Lesser bladderwort
• Utricularia ochroleuca syn Utricularia occidentalis - Yellowishwhite bladderwort

• Vaccinium alaskaense syn Vaccinium alaskense Vaccinium ovalifolium - Alaska blueberry, Oval-leaf blueberry, Alaska blueberry
• Vaccinium caespitosum - Dwarf bilberry, Dwarf blueberry, Dwarf huckleberry
• Vaccinium deliciosum - Cascade blueberry, blueleaf huckleberry, Cascade bilberry, rainier blueberry
• Vaccinium membranaceum syn Vaccinium coccineum, Vaccinium globulare, Vaccinium membranaceum var. rigidum - Mountain huckleberry, Square-twig blueberry, Thinleaf huckleberry, tall huckleberry
• Vaccinium myrtilloides syn Cyanococcus canadensis, Vaccinium angustifolium var. myrtilloides, Vaccinium canadense - Velvetleaf huckleberry, velvet-leaf blueberry
• Vaccinium myrtillus - dwarf blueberry, whortleberry, low blueberry
• Vaccinium ovatum syn Vaccinium ovatum var. saporosum - California huckleberry, Evergreen blueberry, Evergreen huckleberry
• Vaccinium oxycoccos syn Oxycoccus hagerupii, Oxycoccus intermedius, Oxycoccus microcarpos, Oxycoccus ovalifolius, Oxycoccus oxycoccos, Oxycoccus palustris, Oxycoccus palustris ssp. microphyllus, Oxycoccus palustris var. intermedius, Oxycoccus palustris var. ovalifolius, Oxycoccus quadripetalus, Oxycoccus quadripetalus var. microphyllus, Vaccinium microcarpos, Vaccinium oxycoccos ssp. microphyllum, Vaccinium oxycoccos var. intermedium, Vaccinium oxycoccos var. microphyllum, Vaccinium oxycoccos var. ovalifolium - Small cranberry
• Vaccinium parvifolium - Red blueberry, Red huckleberry, Red Whortleberry
• Vaccinium scoparium - Grouse whortleberry, Grouseberry
• Vaccinium uliginosum syn Vaccinium occidentale, Vaccinium uliginosum ssp. alpinum, Vaccinium uliginosum ssp. gaultherioides, Vaccinium uliginosum ssp. microphyllum, Vaccinium uliginosum ssp. occidentale, Vaccinium uliginosum ssp. pedris, Vaccinium uliginosum ssp. pubescens, Vaccinium uliginosum var. alpinum, Vaccinium uliginosum var. occidentale, Vaccinium uliginosum var. salicinum - Alpine blueberry, Bog blueberry, alpine bilberry
• Valeriana columbiana - Wenatchee valerian
• Valeriana dioica - Marsh valerian, northern valerian
• Valeriana scouleri syn Valeriana sitchensis ssp. scouleri, Valeriana sitchensis var. scouleri - Scouler's valerian
• Valeriana sitchensis syn Valeriana sitchensis var. hookeri - Mountain helioptrope, Sitka valerian
• Vancouveria hexandra syn Vancouveria brevicula, Vancouveria parvifolia, Vancouveria picta - Northern inside-out flower, White insideout flower
• Veratrum californicum - California false hellebore, Corn lily, California wild hellebore, skunk cabbage
• Veratrum insolitum - Siskiyou false hellebore, Siskiyou wild hellebore
• Veratrum viride syn Veratrum eschscholtzianum, Veratrum eschscholtzii, Veratrum eschscholtzii var. incriminatum, Veratrum viride ssp. eschscholtzii, Veratrum viride var. eschscholtzii - Green Corn Lily, Green false hellebore, American wild hellebore
• Verbena bracteata syn Verbena bracteosa, Verbena imbricata - Bigbract verbena, Carpet vervain, Prostrate vervain
• Verbena hastata - Blue verbena, Blue vervain, Swamp verbena, wild hyssop
• Verbena stricta - Hoary verbena, Hoary vervain, Tall vervain, Woolly verbena
• Veronica americana - American Brooklime, American speedwell
• Veronica cusickii - Cusick's speedwell
• Veronica scutellata syn Veronica scutellata var. villosa - Skullcap speedwell, marsh speedwell, grass-leaf speedwell
• Veronica serpyllifolia - Thymeleaf speedwell
• Veronica wormskjoldii - Alpine Speedwell, American alpine speedwell, hairy speedwell
• Viburnum edule syn Viburnum pauciflorum - Moosewood viburnum, Squashberry, high-bush cranberry
• Viburnum opulus - European cranberrybush, cranberry-tree, snowball
• Vicia americana - American vetch
• Vicia hirsuta syn Vicia hirsuta var. terronii, Ervum hirsutum, Ervum terronii - Alverjón, Cigerão, Ers lentille, Ers velu, Ervilhaca-pilosa, Hairy tare, Hairy vetch, Rauhhaarwicke, Sparrow vetch, Tare vetch, Tiny vetch, Vesce hérissée, Vesceron, Zitterwicke
• Vicia nigricans - black vetch
• Vicia nigricans ssp. gigantea syn Vicia gigantea - Giant vetch
• Vicia tetrasperma syn Vicia tetrasperma var. tenuissima - lentil vetch
• Viola adunca - Hookedspur violet, Western Blue Violet, early blue violet
• Viola bakeri syn Viola bakeri ssp. grandis, Viola bakeri ssp. shastensis, Viola nuttallii var. bakeri -
  Baker's violet
• Viola canadensis - Canadian white violet
• Viola flettii - Olympic violet, Flett's violet
• Viola glabella - Pioneer violet, Smooth yellow violet, stream violet
• Viola howellii - Howell's violet
• Viola langsdorfii syn Viola simulata, Viola superba - Alaska violet, Aleutian violet
• Viola macloskeyi - Small white violet, Smooth white violet, White mountain violet
• Viola nephrophylla syn Viola maccabeana, Viola nephrophylla var. arizonica, Viola nephrophylla var. cognata, Viola pratincola, Viola retusa - Northern bog violet, Wanderer violet, kidney-leaved violet, prairie blueviolet, wild pansy, wild violet
• Viola odorata - sweet blue violet
• Viola orbiculata syn Viola sempervirens var. orbiculata,Viola sempervirens var. orbiculoides -
  darkwoods violet, round-leaved violet, evergreen yellow violet
• Viola palustris - Marsh Violet
• Viola praemorsa - Canary violet
• Viola purpurea - Goosefoot violet, purplish violet
• Viola sempervirens syn Viola sarmentosa - Evergreen violet, redwood violet
• Viola sheltonii - Shelton's violet, fan violet
• Viola trinervata - Desert pansy, Rainier violet, Sagebrush violet, 3-nerved violet
• Viola vallicola - Sagebrush violet, Yellow violet, Nuttall violet
• Vulpia octoflora - Common Sixweeks Grass, Sixweeks fescue, eight-flowered fescue, pullout grass, sixweeks grass

• Whipplea modesta - Common whipplea, Modesty Whipplevine, Yerba de Selva
• Wolffia borealis syn Wolffia punctata - northern watermeal
• Wolffia brasiliensis syn Bruniera punctata, Wolffia papulifera - Brazilian watermeal
• Woodsia oregana - Oregon cliff fern, western cliff fern
• Woodsia scopulina - Rocky Mt. Woodsia, Laurentian cliff fern
• Woodwardia fimbriata syn Woodwardia chamissoi - Giant chainfern
• Wyethia amplexicaulis syn Espeletia amplexicaulis - Mule-earsnorthern mule-ears, smooth dwarf sunflower
• Wyethia angustifolia syn Wyethia angustifolia var. foliosa - California compassplant, Narrowleaf mule ears, narrowleaf Wyethia

• Xanthium strumarium - Rough cockleburr, Canada cocklebur, common cocklebur
• Xerophyllum tenax syn Helonias tenax - Beargrass, Common beargrass, Western turkeybeard

• Zannichellia palustris syn Zannichellia major, Zannichellia palustris var. major, Zannichellia palustris var. stenophylla - Horned pondweed, Horned poolmat
• Zigadenus elegans - Mountain deathcamas, glaucous death camas
• Zigadenus paniculatus syn Helonias paniculatus, Toxicoscordion paniculatum - Foothill deathcamas, panicled death camas, sand corn
• Zigadenus venenosus - Meadow deathcamas, common death camas
• Zizia aptera syn Zizia aptera var. occidentalis, Zizia cordata - Heartleaf alexanders, Meadow zizia, Meadowparsnip Zizia
• Zostera marina syn Zostera marina var. latifolia, Zostera marina var. stenophylla, Zostera pacifica - Eelgrass, Seawrack

= Poisonous to animal and/or human
= Noxious or Invasive in Washington
= Crop weed in Washington
= Federal Noxious weed in Washington
= Native to Washington
= endangered in Washington
= Found on Whidbey and/or Fidalgo Islands

Flowers Home Page

Common Names: A-F
Common Names: G-M
Common Names: N-S
Common Names: T-Z

Mystery flowers. Can you help me name them?

01 - 02 - 03 - 04 - 05 - 06 - 07 - 08

Endangered Flowers, Washington

Scientific Names: A-F
Scientific Names: G-M
Scientific Names: N-S
Scientific Names: T-Z

Noxious Flowers , Washington

Washington Natives: A-F
Washington Natives: G-M
Washington Natives: N-R
Washington Natives: S-Z (Alphabetized by scientific name)

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Copyright 2007 Colleen D. Bergeron
Last revised: September 18, 2007