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- Abies grandis -Grand fir*
- Abies lasiocarpa -Subalpine-fir*
- Acer glabrum -Rocky mountain maple*
- Acer negundo -Box elder*
- Achillea millefolium -Yarrow*
- Aconitum columbianum var. columbianum -Monkshood*
- Actea rubra -Baneberry*
- Adenocaulon bicolor -Trail-plant, Pathfinder*
- Adiantum pedatum -Northern maidenhair fern*
- Agastache urticifolia -Nettle-leaf giant-hyssop*
- Agoseris aurantiaca -Orange agoseris*
- Agoseris glauca var. agrestis -Pale agoseris, Short-beaked agoseris*
- Alisma plantago-aquatica -American waterplantain*
- Allium brevistylum -Short-style onion*
- Allium cernuum -Nodding onion*
- Allium schoenoprasum -Chives*
- Allium textile -Textile onion*
- Alnus incana -Mountain alder*
- Alnus viridis -Sitka alder, Wavy-leaved alder*
- Amaranthus graezicans -Prostrate pigweed, Tumbleweed, Tumbleweed amaranth*
- Amaranthus retroflexus -Rough pigweed, Pigweed amaranth, Redroot amaranth*
- Ambrosia psilostachya -Western ragweed, Common ragweed*
- Ambrosia trifida -Giant ragweed*
- Amelanchier alnifolia -Serviceberry, Juneberry*
- Amerorchis rotundifolia -Small round-leaved orchis*
- Anaphalis margaritacea -Common pearly-everlasting*
- Androsace septentrionalis -Northern fairy-candelabra*
- Anemone drummondii S. Watson -Drummond's anemone*
- Anemone multifida Poir -Cliff anemone, Pacific anemone*
- Anemone occidentalis S. Watson -Western pasqueflower*
- Anemone parviflora Michx. -Northern anemone, Small-flowered anemone*
- Anemone patens L. -Pasque flower, Crocus*
- Antennaria anaphaloides -Tall pussy-toes*
- Antennaria dimorpha -Low pussytoes*
- Antennaria neglecta -Field pussytoes*
- Antennaria parviflora -Nuttall's pussytoes
- Apocynum androsaemifolium -Dogbane*
- Aquilegia coerulea -Colorado blue columbine, Blue columbine*
- Aquilegia flavescens -Yellow columbine*
- Aquilegia formosa -Red columbine, Sitka columbine*
- Aquilegia jonesii -Limestone columbine*
- Arabis holboellii var. retrofracta -Holboell's rockcress*
- Arabis sparsiflora var.subvillosa -Elegant rockcress, sicklepod rockcress*
- Aralia nudicaulis -Wild sarsaparilla*
- Arctium minus -Cocklebur*
- Arctostaphylos uva-ursi -Kinnikinnik, Bearberry*
- Arenaria hookeri -Hooker's sandwort*
- Arenaria laterifolia -Bluntleaf sandwort*
- Aristida purpurea var. longiseta -Purple threeawn*
- Arnica cordifolia -Heartleaf arnica*
- Arnica latifolia var. latifolia -Mountain arnica*
- Arnica sororia -Twin arnica*
- Artemisia cana -Silver sagebrush*
- Artemisia ludoviciana ssp. Candicans -Western mugwort*
- Artemisia tridentata ssp. tridentata -Great Basin big sagebrush*
- Artemisia tridentata ssp. vaseyana -Mountain big sagebrush*
- Artemisia tridentata ssp. wyomingensis -Wyoming big sagebrush*
- Asarum caudatum -Wild ginger*
- Asclepias speciosa -Showy milkweed*
- Asclepias viridiflora -Green milkweed*
- Aster eatonii -Eaton's aster*
- Aster foliaceus var. parryi -Leafy aster*
- Aster hesperius -Western willow aster, Marsh aster*
- Astragalus aboriginum -Indian milkvetch*
- Astragalus agrestis -Field milkvetch, Purple milkvetch*
- Astragalus bisulcatus -Two-groove milkvetch*
- Astragalus canadensis v. canadensis -Canada milkvetch*
- Astragalus ceramicus -Painted milkvetch*
- Astragalus convallarius -Lesser rushy milkvetch*
- Astragalus crassicarpus -Ground plum, Buffalo plum*
- Astragalus drummondii -Drummond's milkvetch*
- Astragalus gilviflorus -Plains orophaca*
- Astragalus gracilis -Slender milkvetch*
- Astragalus miser -Weedy milkvetch*
- Astragalus missouriensis -Missouri milkvetch*
- Astragalus pectinatus -Tine-leaved milkvetch*
- Astragalus spatulatus -Draba milkvetch*
- Astragalus vexilliflexus v. vexilliflexus -Bent-flowered milkvetch*
- Athyrium filix-femina -Lady fern*
- Atriplex confertifolia -Shadscale, spiny saltbush, sheepfat*
- Atriplex dioica -Rillscale*
- Atriplex nuttallii -Saltsage*
- Bahia oppositifolia -Bahia*
- Balsamorhiza sagittata -Arrowleaf balsamroot*
- Barbarea orthocereus -Wintercress*
- Berberis aquifolium Pursh -Shining oregon-grape, Tall oregon-grape*
- Berberis repens Lindl -Creeping barberry, Oregon-grape*
- Besseya rubra -Red kittentail*
- Besseya wyomingensis -Wyoming kittentail*
- Betula occidentalis -Water birch, spring birch, red birch*
- Betula papyrifera -Paper birch*
- Bouteloua gracilis -Blue grama*
- Brassica campestris -Field mustard, Common mustard*
- Brickellia grandiflora -Large-flowered brickellia
- Bromus brizaeformis -Rattle grass, rattlesnake grass*
- Bromus japonicus -Japanese brome*
- Bromus tectorum -Cheat grass, downy brome*
- Bupleurum americanum -American thorough-wax*
- Calochortus apiculatus -Pointed mariposa, Baker's mariposa*
- Calochortus eurycarpus -Wide-fruited mariposa, Big-pod mariposa*
- Calochortus gunnisonii -Gunnison's mariposa, Sego-lily*
- Calochortus macrocarpus -Sagebrush mariposa, Green-banded star-tulip*
- Calochortus nuttallii -Sego-lily, Nuttall's sego-lily*
- Caltha leptosepala -Elkslip, Eastern marshmarigold*
- Calypso bulbosa -Fairy-slipper*
- Camassia quamash -Blue camas*
- Campanula rotundifolia L. -Scotch bellflower, Harebell, Lady'-thimble*
- Capsella bursa-pastoris -Shepherd's purse*
- Cardamine oligosperma -Siberia bittercress, Little western bittercress, Few-seeded bittercress*
- Cardamine pensylvanica -Pennsylvania bittercress*
- Cardaria draba -Whitetop*
- Carduus nutans -Musk thistle*
- Carex disperma -Soft leaved sedge*
- Carex flava -Yellow sedge*
- Carex microptera -Small-winged sedge*
- Carex nebrascensis -Nebraska sedge*
- Carex rostrata -Beaked sedge*
- Cassiope mertensiana -Mertens' mountain heather*
- Castilleja angustifolia -Northwest paintbrush*
- Castilleja cusickii -Cusick's paintbrush*
- Castilleja gracillima -Slender paintbush*
- Castilleja linariaefolia -Narrow-leaved paintbrush*
- Castilleja lutescens -Yellowish paintbrush*
- Castilleja miniata -Scarlet paintbrush, Common paintbrush*
- Castilleja occidentalis x rhexifolia -Western paintbrush*
- Castilleja pulchella -Showy Indian-paintbush*
- Castilleja rhexifolia -Rhexia-leaved paintbrush*
- Castilleja sessiliflora -Downy painted-cup*
- Castilleja sulphurescens -Sulfur paintbrush*
- Ceanothus sanguineus -Redstem ceanothus*
- Ceanothus velutinus -Mountain balm, Sticky-laurel, Snowbrush, Tobacco-brush*
- Centaurea stoebe -Spotted knapweed*
- Cerastium arvense -Field chickweed, Starry cerastium, field mouse-ear*
- Cerastium berringianum -Alpine chickweed, Alpine cerastium*
- Ceratoides lanata -Winterfat*
- Cercocarpus ledifolius -Curlleaf mountain-mahogany*
- Cercocarpus montanus -Birch-leaf mountain-mahogany, true mountain-mahogany*
- Chaenactis douglasii -Hoary chaenactis, Hoary false-yarrow*
- Chamaebatiaria millefolium -Fern-bush, Desert-sweet*
- Chamaerhodos erecta -Chamaerhodos*
- Chenopodium glaucum -Glaucous goosefoot, Oakleaf goosefoot*
- Chenopodium leptophyllum -Slimleaf goosefoot*
- Chenopodium rubrum -Red goosefoot*
- Chimaphila umbellatum -Pipsissewa*
- Chorispora tenella -Blue mustard*
- Chrysanthemum leucanthemum -Oxeye-daisy*
- Cichorium intybus -Chicory*
- Cicuta douglasii (DC.) J.M. Coult. & Rose -Douglas' water hemlock*
- Circaea alpina -Enchanter's nightshade*
- Cirsium arvense -Canada thistle*
- Cirsium scariosum -Elk thistle*
- Cirsium undulatum -Wavy-leaved thistle*
- Cirsium vulgare -Common thistle, Bull thistle, Field thistle*
- Clarkia pulchella -Elkhorns clarkia*
- Clarkia rhomboidea -Rhombic-petaled clarkia, common clarkia*
- Claytonia lanceolata -Western springbeauty, Lanceleaf springbeauty*
- Claytonia perfoliata -Miner's lettuce*
- Claytonia sibirica -*
- Clematis columbiana -Columbia virgin's bower*
- Clematis hirsutissima -Douglas' clematis, Leatherflower, Vaseflower, Sugarbowls*
- Clematis ligusticifolia -Western clematis, White virgin's_bower*
- Cleome lutea -Yellow bee plant*
- Cleome serrulata -Rocky Mountain bee plant, Stinkweed*
- Clintonia uniflora -Beadlily, Queen's cup, Bride's bonnet*
- Collinsia parviflora -Small-flowered blue-eyed Mary*
- Collomia debilis -Alpine collomia*
- Collomia linearis -Narrow-leaf collomia*
- Comandra umbellata -Bastard toadflax*
- Conimitella williiamsii -Conimitella*
- Conium maculatum -Poison-hemlock*
- Conringia orientalis -Hare's ear mustard, Hare's ear cabbage, Treacle mustard*
- Convolvulus arvensis -Field bindweed, Morning glory*
- Coptis occidentalis -Western goldthread*
- Corallorhiza maculata -Spotted coral-root*
- Corallorhiza striata -Hooded coral-root, Striped coral-root*
- Corallorhiza wisteriana -Wister coral-root*
- Cornus canadensis L. -Bunchberry*
- Cornus sericea L. -Red-osier dogwood*
- Corydalis aurea -Golden corydalis*
- Crataegus columbiana -Columbia hawthorn*
- Crataegus douglasii -Black hawthorne*
- Crepis occidentalis -Western hawksbeard*
- Crepis runcinata -Dandelion hawksbeard, Meadow hawksbeard*
- Cryptantha celosioides -Cockscomb cryptantha, Northern cryptantha*
- Cuscuta approximata -Dodder*
- Cynoglossum officinale -Common hound's tongue*
- Cypripedium montanum -Mountain lady's-slipper*
- Cypripedium parviflorum -Yellow lady's slipper*
- Cypripedium passerinum -Northern lady's slipper*
- Dalea candida -White prairie clover*
- Dalea purpurea -Purple prairie clover*
- Delphinium bicolor -Montana larkspur, Little larkspur*
- Delphinium depauperatum -Slim larkspur, Dwarf larkspur*
- Delphinium nuttallianum var. nuttallianum -Upland larkspur*
- Delphinium occidentale -Western larkspur, Duncecap larkspur*
- Descurainia sophia -Flixweed*
- Dianthus armeria -Deptford pink, Grass pink*
- Dipsacum fullonum -Teasel*
- Dodecatheon conjugens -Slimpod shooting-star, Desert shooting-star*
- Dodecatheon pulchellum -Few-flowered shooting-star, Dark-throat shooting-star*
- Douglasia montana -Mountain douglasia*
- Draba lonchophora -Lancefruit draba*
- Draba oligosperma -Few-seeded draba*
- Draba verna -Spring whitlow-wort*
- Dryas octopetala -White dryad*
- Dryopteris cristata -Crested shield-fern*
- Dyssodia papposa -Fetid marigold, False dogfennel*
- Elymus canadensis -Canada wildrye*
- Elymus lanceolatus ssp. lanceolatus -Thickspike wheatgrass*
- Epilobium alpinum -Alpine willow-herb*
- Epilobium angustifolium -Fireweed*
- Epilobium glaberrimum -Smooth willow-herb*
- Epilobium glandulosum -Common willow-herb*
- Epilobium paniculatum -Autumn willow-herb, Tall annual willow-herb*
- Epilobium watsonii -Watson's willow-herb*
- Equisetum arvense -Common horsetail, snake-grass*
- Equisetum hyemale -Scouring rush*
- Ericameria nauseosus -Rubber rabbitbrush*
- Erigeron compositus v. glabratus -Cut-leaved daisy, Dwarf mountain fleabane*
- Erigeron peregrinus ssp.callianthemus v. eucallianthemus -Subalpine daisy, Wandering daisy*
- Erigeron pumilis ssp.intermedius var. euintermedius -Shaggy fleabane*
- Erigeron pumilis ssp.pumilis -Shaggy fleabane*
- Erigeron speciosus var. speciosus -Showy fleabane*
- Erigeron strigosus var. strigosus -Daisy fleabane, branching daisy*
- Eriogonum annuum -Annual buckwheat*
- Eriogonum caespitosum -Mat buckwheat*
- Eriogonum flavum -Yellow buckwheat*
- Eriogonum heracleoides var. angustifolium -Wyeth buckwheat, parsnip-flowered eriogonum*
- Eriogonum ovalifolium v. celsum -Oval-leaved eriogonum, Cushion buckwheat*
- Eriogonum umbellatum v. subalpinum -Sulfur buckwheat*
- Eritrichium nanum -Pale alpine forget-me-not*
- Erodium cicutarium -Storksbill, Alfilaria, Filaree*
- Erysimum asperum -Rough wallflower, Prairie rocket*
- Erysimum inconspicuum -Small flowered rocket, Small wallflower*
- Erythronium grandiflorum -Pale fawn-lily, Yellow fawn-lily, Yellow dogtooth-violet*
- Escobaria missouriensis -Yellow pincushion cactus, Nipple cactus*
- Escobaria vivipara -Pink pincushion cactus, Cushion cactus, Ball cactus*
- Euphorbia esula -Leafy spurge*
- Euphorbia glyptosperma -Corrugate-seeded spurge*
- Euphorbia spathulata -Spatulate-leaved spurge*
- Festuca idahoensis -Idaho fescue*
- Fragaria virginiana -Strawberry*
- Frasera speciosa -Green gentian*
- Fraxinus pennsylvanica -Green ash*
- Fritillaria atropurpurea -Checker lily, Chocolate lily, Leopard lily*
- Fritillaria pudica -Yellow bell*
- Gaillardia aristata Pursh -Blanketflower*
- Galium aparine -Cleavers, Goose-grass*
- Galium asperrimum -Rough bedstraw*
- Galium boreale -Northern bedstraw*
- Gaura coccinea -Scarlet gaura*
- Gentiana affinis -Pleated gentian, Prairie gentian*
- Gentiana algida -Whitish gentian*
- Gentiana amarella -Northern gentian*
- Geranium bicknellii -Bicknell's geranium*
- Geranium pusillum -Small-flowered crane's-bill*
- Geranium richardsonii -Richardson's white geranium*
- Geranium viscossissimum -Sticky geranium*
- Geum triflorum -Prairie smoke*
- Gilia aggregata -Scarlet gilia, Skyrocket*
- Gilia spicata -Spicate gilia*
- Glecoma hederacea -Field balm, Creeping Charlie*
- Glychyrrhiza lepidota -Wild licorice, Licorice root*
- Goodyera oblongifolia -Rattlesnake plantain*
- Grindelia nana -Low gumweed*
- Grindelia squarrosa -Curly-cup gumweed*
- Gymnocarpium dryopteris -Oak-fern*
- Hackelia patens -Spreading stickseed*
- Hedeoma drummondii -Drummond's pennyroyal*
- Hedysarum boreale -Northern sweetvetch, Northern hedysarum*
- Hedysarum occidentale -Western sweet vetch*
- Hedysarum sulphurescens -Yellow hedysarum*
- Helianthella uniflora -Rocky mountain helianthella*
- Helianthus annuus -Common sunflower*
- Heliotropium curassavicum -Salt heliotrope, Seaside heliotrope*
- Heracleum lanatum -Cow-parsnip*
- Hesperochiron californicus -California hesperochiron*
- Hesperostipa comata -Needle-and-thread grass*
- Heterotheca villosa -Golden aster*
- Heuchera cylindrica -Roundleaf alumroot, Lava alumroot*
- Hieracium albiflorum -White-flowered hawkweed*
- Hieracium aurantiacum -King devil, Orange hawkweed, Golden mouse-ear hawkweed*
- Hieracium pratense -Yellow hawkweed*
- Holodiscus discolor (Pursh.) Maxim. -Ocean-spray*
- Hordeum jubatum -Foxtail barley*
- Hydrophyllum capitatum -Waterleaf*
- Hymenoxis richardsonii -Richardson's hymenoxys*
- Hyoscyamis niger -Black henbane, Hog's bean*
- Hypericum formosum var. nortoniae -Western St. John's-wort*
- Hypericum perforatum -Common St. John's wort, Goatweed*
- Iliamna rivularis -Streambank globemallow, Wild hollyhock*
- Impatiens ecalcarata -Spurless balsam*
- Iris missouriensis -Blue flag, Wild iris*
- Iva axillaris -Poverty weed*
- Ivesia gordonii -Gordon's ivesia*
- Juncus ensifolius -Dagger-leaf rush*
- Juncus hallii -Hall's rush*
- Juniperus communis -Common juniper*
- Juniperus horizontalis -Creeping juniper, horizontal juniper*
- Juniperus scopulorum -Rocky Mountain juniper*
- Kalmia microphylla -Small-leaved laurel, Alpine laurel*
- Kochia scoparia -Summer cypress, Mock cypress*
- Lactuca biennis -Tall blue lettuce*
- Lactuca pulchella -Blue lettuce*
- Lactuca serriola -Prickly lettuce*
- Lamium amplexicaule -Common dead-nettle*
- Lappula redowskii -Western stickseed*
- Larix lyallii -Alpine larch, subalpine larch*
- Larix occidentalis -Western larch, mountain larch, hackmatack, tamarack, western tamarack*
- Ledum glandulosum -Labrador tea*
- Lepidium densiflorum -Prairie pepperweed, Common pepperweed*
- Lepidium perfoliatum -Clasping pepperweed*
- Leptarrhena pyrolifolia -False saxifrage, Leatherleaf saxifrage*
- Leucocrinum montanum -Sand lily, Star lily, Mountain lily, Wild tuberose, Star-of-Bethlehem*
- Lewisia pygmaea -Pygmy bitterroot*
- Lewisia rediviva -Bitterroot*
- Liatris punctata -Dotted gayfeather*
- Lilium philadelphicum -Wood lily, Philadelphia lily, Red lily*
- Linaria dalmatica -Dalmatian toadflax*
- Linaria vulgaris -Butter-and-eggs*
- Linnaea borealis -Western twinflower*
- Linum perenne -Blue flax*
- Linum rigidum -Yellow flax, Large-flowered yellow flax*
- Listera cordata -Heart-leaf twayblade*
- Lithophragma parviflora -Smallflower fringecup, Woodlandstar*
- Lithospermum arvense -Corn gromwell*
- Lithospermum incisum -Yellow gromwell*
- Lithospermum ruderale -Western gromwell, Columbia puccoon*
- Lloydia serotina -Alpine lily*
- Lomatium cous -Cous, Cous bisquitroot*
- Lomatium dissectum -Fern-leaved lomatium*
- Lomatium foeniculaceum -Fennel-leaved desert-parsley*
- Lomatium macrocarpum -Large-fruit lomatium*
- Lomatium triternatum -Nine-leaf lomatium*
- Lonicera ciliosa -Orange vine honeysuckle, Trumpet honeysuckle, Northwest honeysuckle*
- Lonicera involucrata -Twinberry honeysuckle, Bearberry honeysuckle*
- Lonicera utahensis -Utah honeysuckle*
- Lupinus caudatus -Tailcup lupine, Kellog spurred lupine*
- Lupinus lepidus var. utahensis -Prairie lupine*
- Lupinus leucophyllus -Velvet lupine*
- Lupinus polyphyllus var. burkei -Bigleaf lupine, many-leaved lupine, large-leaved lupine*
- Lupinus pusillus -Low lupine, Rusty lupine*
- Lupinus sericeus -Silky lupine*
- Lupinus wyethii -Wyeth's lupine*
- Luzula campestris v. multiflora -Field woodrush*
- Lychnis alba -White campion, Evening campion*
- Lychnis drummondii -Drummond campion*
- Lycopodium clavatum -Elk-moss, ground-pine, stag's horn moss*
- Lycopus asper -Rough bugleweed*
- Lygodesmia juncea -Rush skeletonweed*
- Lysitchitum americanum -Skunk-cabbage*
- Machaeranthera grindeloides -Gumweed aster*
- Machaeranthera pinnatifida -Spiny goldenweed*
- Maianthemum racemosa -False Solomon's seal*
- Maianthemum stellatum -Starry Solomon's seal*
- Malva neglecta -Dwarf mallow*
- Malva parviflora -Cheeseweed*
- Marchantia polymorpha -liverwort*
- Matricaria maritima -Scentless may-weed*
- Matricaria matricarioides -Pineapple weed*
- Medicago lupulina -Black medic*
- Medicago sativa -Alfalfa*
- Melilotus alba -White sweet-clover*
- Melilotus officinalis -Yellow sweet-clover*
- Mentha arvensis -Corn mint, Field mint*
- Mentzelia decapetala -Sand lily, Evening star*
- Mentzelia laevicaulis -Blazing star*
- Menyanthes trifoliatum -Buckbean, bogbean*
- Menziesia ferruginea v. glabella -Fool's huckleberry, Mock azalea, Rusty menziesia*
- Mertensia ciliata -Mountain bluebells, Ciliate bluebells, Broad-leaf bluebells*
- Mertensia oblongifolia -Bluebells, Leafy bluebells*
- Micranthes rhomboidea -Diamondleaf saxifrage*
- Micranthes subapetala -Bog saxifrage*
- Microseris cuspidata -Toothed microseris*
- Microsteris gracilis -Pink microsteris*
- Mimulus guttatus v. guttatus -Yellow monkey-flower*
- Mimulus lewisii -Lewis' monkey-flower*
- Mimulus moschatus var. moschatus -Musk flower*
- Mirabilis linearis -Narrow-leaved four-o'clock*
- Mitella breweri -Brewer's mitrewort*
- Mitella nuda -Bare-stemmed mitrewort, Stoloniferous mitrewort*
- Mitella pentandra -Alpine mitrewort, five-stamened mitrewort*
- Monarda fistulosa L. -Beebalm, Bergamot, Horsemint*
- Moneses uniflora -Woodnymph, Single delight, Wintergreen, Wax-flower wintergreen*
- Monolepsis nuttalliana -Patata*
- Monotropa uniflora -Indian-pipe*
- Musineon divaricatum -Leafy musineon*
- Myosotis asiatica -Wood forget-me-not*
- Neottia convallarioides (Sw.) Rich. -Broad leaved twayblade*
- Nepeta cataria -Catnip*
- Nuphar polysepalum -Spatterdock*
- Oenothera albicaulis -Prairie evening primrose*
- Oenothera caespitosa -Gumbo evening primrose*
- Oenothera flava -Long-tubed evening primrose*
- Oenothera hookeri -Hooker's evening primrose*
- Oenothera subacaulis -Long-leaf evening primrose*
- Onobrychis viciaefolia -Sainfoin*
- Oplopanax horridum -Devil's club*
- Opuntia polyacantha -Prairie prickly-pear, Starvation cactus*
- Origanum vulgare -Oregano*
- Orobanche fasciculata -Clustered broomrape*
- Orobanche ludoviciana -Suksdorf's broomrape*
- Orobanche uniflora -Naked broomrape*
- Orthilia secunda -One-sided wintergreen, Sidebells pyrola*
- Orthocarpus luteus -Yellow owl-clover*
- Orthocarpus tenuifolius -Thin-leaved owl-clover*
- Oryzopsis hymenoides -Indian rice-grass*
- Osmorhiza chilensis -Mountain sweet-root*
- Osmorhiza occidentalis -Western sweet-root*
- Oxalis corniculata -Creeping yellow woodsorrel*
- Oxyria digyna -Mountain sorrel*
- Oxytropis besseyi v.argophylla -Bessey's crazyweed*
- Oxytropis campestris v. gracilis -Slender crazyweed, Field crazyweed*
- Oxytropis deflexa v. sericea -Pendent-pod crazyweed*
- Oxytropis lagopus v. conjugens -Rabbit-foot crazyweed *
- Oxytropis sericea v. sericea -Silky crazyweed*
- Oxytropis sericea v.spicata -Silky crazyweed*
- Pachistima myrsinites -Mt.box, Mountain-lover, Myrtle boxwood, Oregon boxwood*
- Packera cana -Woolly groundsel*
- Parnassia fimbriata -Fringed grass-of-Parnassus*
- Parnassia palustris -Northern grass-of-Parnassus, Wideworld grass-of-Parnassus*
- Paronychia sessiliflora -Whitlow wort*
- Pascopyrum smithii -Western wheatgrass*
- Pedicularis bracteosa var. bracteosa -Bracted lousewort*
- Pedicularis bracteosa var. paysoniana -Bracted lousewort*
- Pedicularis contorta v. contorta -White coiled-beak lousewort*
- Pedicularis groenlandica -Elephant-head*
- Pedicularis oederi -Oeder's lousewort*
- Pedicularis parryi var. purpurea -Parry's lousewort*
- Pedicularis racemosa v. alba -Leafy lousewort, Sickletop lousewort*
- Pediomelum argophyllum -Silver-leaved scurf-pea*
- Penstemon albertinus -Alberta penstemon*
- Penstemon albidus -White-flowered penstemon*
- Penstemon attenuatus v. attenuatus -Sulfur penstemon*
- Penstemon cyaneus -Dark-blue penstemon*
- Penstemon deustus v. deustus -Hot-rock penstemon*
- Penstemon ellipticus -Elliptic-leaved beardtongue*
- Penstemon eriantherus -Fuzzy-tongue penstemon, Crested-tongue penstemon*
- Penstemon fruticosus v. fruticosus -Shrubby penstemon*
- Penstemon nitidus v. nitidus -Waxleaf penstemon, Shining penstemon*
- Penstemon procerus v. procerus -Tiny-bloom penstemon, Small-flower penstemon*
- Penstemon rydbergii -Rydberg's penstemon*
- Penstemon whippleanus -Whipple's penstemon*
- Penstemon wilcoxii -Wilcox's penstemon*
- Pentaphylloides floribunda -Shrubby cinquefoil*
- Phacelia hastata -Whiteleaf phacelia, Silverleaf phacelia*
- Phacelia heterophylla var. heterophylla -Varileaf phacelia, Virgate phacelia*
- Phacelia linearis -Threadleaf phacelia*
- Phacelia lyallii -Lyall's phacelia*
- Phacelia sericea -Silky phacelia*
- Philadelphus lewisii -Mockorange, Syringa*
- Phlox hoodii -Hood's phlox*
- Phlox kelseyi v. kelseyi -Kelsey's plox*
- Phlox longifolia -Long-leaf phlox*
- Phlox muscoides -Moss phlox*
- Phlox pulvinata -Cushion phlox*
- Phlox speciosa -Showy phlox*
- Phylodoce empetriformis -Red mountain heath, Pink mountain heath*
- Phylodoce glanduliflora -Yellow mountain heath, Cream mountain heath*
- Physaria didymocarpa -Common twinpod*
- Physocarpus malvaceus -Ninebark*
- Picea engelmannii -Engelmann spruce, Silver spruce*
- Picea glauca -White spruce*
- Pinus albicaulis -Whitebark pine*
- Pinus contorta -Lodgepole pine*
- Pinus flexilis -Limber pine*
- Pinus monticola -White pine*
- Pinus ponderosa -Ponderosa pine, Yellow pine*
- Piperia elegans -Rein orchid*
- Piperia unalascensis -Alaska rein-orchid*
- Plantago elongata -Slender plantain*
- Plantago lanceolata -English plantain, Buckhorn plantain, Ribwort*
- Plantago patagonica -Indian-wheat*
- Platanthera dilatata -White bog-orchid, Boreal bog-orchid, Leafy white orchis, Bog candle*
- Platanthera dilatata v. leucostachys -White bog-orchid, Boreal bog-orchid, Leafy white orchis, Bog candle*
- Platanthera hyperborea v. gracilis -Canyon bog-orchid*
- Platanthera hyperborea v. hyperborea -Northern green bog-orchid*
- Platanthera orbiculata -Large round-leaved rein-orchid*
- Polanisia trachysperma -Clammy-weed*
- Polemonium pulcherrimum -Skunk-leaved polemonium, Showy polemonium*
- Polemonium viscosum -Sticky polemonium, Sky pilot, Sticky jacob's ladder*
- Polygonum aviculare -Doorweed, Prostrate knotweed*
- Polygonum bistortoides -American bistort, Western bistort, Snakeweed*
- Polygonum coccineum -Water smartweed*
- Polygonum convolvulus -Dullseed, Cornbind, Climbing bindweed, Knot bindweed, Ivy bindweed*
- Polystichum munitum var. munitum -Western sword fern*
- Populus angustifolia -Narrow-leaved cottonwood, Mountain cottonwood*
- Populus deltoides -Plains cottonwood*
- Populus tremuloides -Quaking aspen, Trembling aspen*
- Populus trichocarpa -Black cottonwood*
- Portulaca oleracea -Common purslane*
- Potentilla anserina -Common silverweed*
- Potentilla arguta -Glandular cinquefoil*
- Potentilla diversifolia -Diverse-leaved cinquefoil, Vari-leaf cinquefoil*
- Potentilla gracilis v. glabrata -Cinquefoil*
- Potentilla norvegica -Norwegian cinquefoil*
- Potentilla ovina -Sheep cinquefoil*
- Potentilla palustris -Purple cinquefoil, marsh cinquefoil*
- Potentilla recta -Sulfur cinquefoil*
- Prosartes trachycarpa -Wartberry fairy-bells, Sierra fairy-bells*
- Prunella vulgaris -Self-heal, All-heal*
- Prunella vulgaris v. lanceolata (W.P.C.Barton) -Lanceleaf all-heal*
- Prunus virginiana -Chokecherry*
- Pseudoregneria spicata -bluebunch wheatgrass*
- Pseudotsuga menziessii v. glauca -Rocky Mountain Douglas-fir*
- Psoralidium tenuiflorum -Slender-flowered scurf-pea, Slim-flowered scurf-pea*
- Pteridium aquilinum -Bracken fern, brake-fern*
- Pterospora andromedea Nutt. -Pinedrops*
- Purshia tridentata -Antelope bitterbrush*
- Pyrola asarifolia -Leafless pyrola, alpine pyrola*
- Pyrola chlorantha -Green wintergreen, Leafless pyrola*
- Pyrola picta -White vein pyrola*
- Quercus macrocarpa -Bur oak, Mossy-cup oak*
- Ranunculus acriformis -Sharp buttercup*
- Ranunculus acris -Tall buttercup*
- Ranunculus aquatilis v. capillaceous -White water buttercup*
- Ranunculus cymbalaria -Shore buttercup, Seaside buttercup*
- Ranunculus eschscholtzii -Subalpine buttercup*
- Ranunculus flabellaris -Yellow western buttercup*
- Ranunculus glabberimus v. ellipticus -Sagebrush buttercup, Smooth buttercup*
- Ranunculus inamoenus -Unlovely buttercup*
- Ranunculus natans -Floating western-buttercup*
- Ranunculus uncinatus -Little buttercup*
- Ratibida columnifera -Prairie coneflower*
- Rhamnus purshiana DC -Cascara, Buckthorn*
- Rhinanthus crista-galli -Rattle-box*
- Rhododendron albiflorum -White rhododendron, Cascade azalea, white-flowered azalea*
- Rhus aromatica -Skunkbush sumac, Aromatic sumac*
- Rhus glabra -Smooth sumac*
- Rhus radicans -Poison-ivy*
- Ribes aureum Pursh. -Golden currant*
- Ribes cereum v. cereum Douglas -Wax currant*
- Ribes hudsonianum Richardson -Stinking currant, Northern black currant*
- Ribes inerme Rydb. -Smooth gooseberry*
- Ribes lacustre (Pers.) Poir -Swamp gooseberry, Swamp black gooseberry, Prickly currant*
- Ribes laxiflorum Pursh -Western black currant, Trailing black currant*
- Ribes setosum Lindl. -Missouri gooseberry*
- Ribes viscossissimum Pursh -Sticky currant*
- Rorippa nasturtium-aquaticum -Water-cress*
- Rosa arkansana -Arkansas rose*
- Rosa nutkana v. hispida -Bristley nootka rose*
- Rosa woodsii v. ultramontana -Wood's rose*
- Rubus idaeus v. strigosus (Michx.) Maxim. -Raspberry*
- Rubus parviflorus Nutt. -Thimbleberry*
- Rumex crispus -Curly dock, sour dock*
- Rumex obtusifolius -Bitterdock*
- Rumex paucifolius -Alpine sorrel, Mountain sorrel*
- Rumex venosus -Veiny dock, Winged dock, Wild begonia*
- Sagittaria cuneata -Arumleaf arrowhead, Wapato*
- Salicornia rubra -Pickleweed, Glasswort, Samphire*
- Salix amygdaloides -Peach-leaf willow*
- Salix bebbiana -Bebb's willow*
- Salix commutata -Undergreen willow*
- Salix lasiandra -Whiplash willow, Caudate willow*
- Salix rigida v. mackenzieana -Mackenzie willow*
- Salix scouleriana -Scouler willow*
- Salsola kali -Russian thistle*
- Sambucus mexicana -Blue elderberry*
- Sambucus racemosa v.melanocarpa -Black elderberry*
- Sarcobatus vermiculatus -Black greasewood*
- Saxifraga arguta -Brook saxifrage*
- Saxifraga bronchialis -Matted saxifrage, Spotted saxifrage*
- Schedonnardus paniculatus -Tumblegrass*
- Schizachyrium scoparium -little bluestem*
- Scirpus americanus -American bulrush*
- Scirpus pallidus -Pale bulrush*
- Sedum lanceolatum -Lanceleaved stonecrop*
- Sedum rhodanthum -Rose crown*
- Sedum roseum -King's crown, Roseroot, Midsummer-men*
- Sedum stenopetalum -Wormleaf stonecrop*
- Selaginella densa -Dense clubmoss*
- Senecio crassulus -Thick-leaved groundsel*
- Senecio triangularis -Arrowleaf groundsel*
- Shepherdia argentea -Silver buffaloberry*
- Shepherdia canadensis -Canada buffaloberry*
- Sibbaldia procumbens -Creeping sibbaldia*
- Silene acaulis -Moss campion, Moss pink, Cushion pink*
- Sisymbrium loesselii -Loesel tumblemustard*
- Sisyrinchium angustifolium -Blue-eyed-grass*
- Smelowskia calycina -Alpine smelowskia*
- Solanum dulcamara -Bittersweet, Climbing nightshade, Felonwort, Blue bindweed*
- Solanum rostratum -Buffalo bur*
- Solanum sarrachoides -Hairy nightshade*
- Solanum triflorum -Cut-leaved nightshade*
- Solidago gigantea -Smooth goldenrod, Late goldenrod
- Solidago missouriensis -Missouri goldenrod*
- Solidago simplex -Dune goldenrod*
- Solidago simplex var. nana -Dune goldenrod*
- Sonchus asper -Prickly sow-thistle*
- Sorbus scopulina v. scopulina -Cascade mountain-ash*
- Spartina gracilis -Alkali cordgrass*
- Sphaeralcea coccinea -Scarlet globemallow*
- Spiranthes romanzoffiana -Lady's tresses*
- Spirea betulifolia -Birch-leaf spirea*
- Spirea densiflora -Subalpine spirea*
- Spirea douglasii -Menzies' spirea*
- Sporobolus airoides -Alkali sacaton*
- Stellaria americana -American starwort*
- Stellaria simcoe -Simcoe mountain starwort*
- Suaeda intermedia -Tall seablite*
- Suaeda occidentalis -Slender seablite*
- Suckleya suckleyana -Suckleya*
- Symphoricarpos albus -White snowberry*
- Symphoricarpos occidentalis -Western snowberry, Wolfberry*
- Symphoricarpos oreophilus -Mountain snowberry*
- Symphyotrichum falcatum -Creeping white prairie aster*
- Symphyotrichum laeve (Aster laevis var. geyeri) -Smooth aster*
- Synthyris pinnatifida v. canescens -Cut-leaf synthyris*
- Taraxacum officinale -Dandelion*
- Taxus brevifolia -Western yew, Pacific yew*
- Telesonix heucheriformis -Rafael James' saxifrage*
- Tetraneuris acaulis -Stemless hymenoxys, Stemless tetraneuris*
- Thalictrum occidentale -Western meadowrue*
- Thalictrum venulosum -Veiny meadowrue*
- Thermopsis montana -Mountain thermopsis*
- Thermopsis rhombifolia -Round-leaved thermopsis*
- Thlaspi arvense -Fanweed*
- Thuja plicata -Giant arborvitae, Western red-cedar*
- Tiarella trifoliata v. unifoliata -Coolwort, Foamflower, False-mitrewort, Laceflower*
- Townsendia hookeri -Hooker's townsendia*
- Townsendia parryi -Parry's townsendia*
- Tragopogon dubius -Goatsbeard, Salsify*
- Tribulus terrestris -Puncture vine, Goathead*
- Trifolium dubium -Yellow clover*
- Trifolium haydenii -Hayden's clover*
- Trifolium nanum -Dwarf clover*
- Trifolium pratense -Red clover*
- Trifolium repens -White clover*
- Trillium ovatum -White trillium, Western wake-robin, Western trillium*
- Triteliea grandiflora -Wild hyacinth, Brodiaea*
- Trollius laxus -American globeflower*
- Tsuga heterophylla -Western hemlock, pacific hemlock, lowland hemlock*
- Turritis glabra -Tower mustard*
- Tussilago farfara -Coltsfoot*
- Typha latifolia -Cattail*
- Ulmus americana -American elm*
- Urtica dioica -Nettle*
- Vaccinium ovalifolium -Oval-leaf huckleberry*
- Vaccinium scoparium -Grouse whortleberry, Grouseberry*
- Valeriana edulis -Edible valerian, Tobacco-root*
- Valeriana sitchensis -Mountain heliotrope, Sitka valerian*
- Veratrum viride -False-hellebore*
- Verbascum blattaria -Moth mullein*
- Verbascum thapsus -Flannel mullein*
- Verbena bracteata -Bracted verbena*
- Veronica americana -American brooklime*
- Veronica anagallis-aquatica -Water speedwell, Water pimpernell*
- Veronica arvensis -Wall speedwell, Common speedwell*
- Veronica catenata -Chain speedwell*
- Veronica peregrina v. peregrina -Purslane speedwell*
- Veronica persica -Persian speedwell*
- Veronica serpyllifolia -Thyme-leaved speedwell*
- Veronica wormskjoldii -American alpine speedwell*
- Vicia americana -American vetch*
- Viola adunca -Early blue violet, Hook violet*
- Viola adunca var. bellidifolia -Hook violet*
- Viola canadensis -Canada violet*
- Viola glabella -Stream violet, Pioneer violet*
- Viola macloskeyi -Small white violet*
- Viola nephrophylla -Northern bog violet*
- Viola nuttallii v.nuttallii -Yellow prairie violet*
- Viola nuttallii v.vallicola -Valley yellow violet*
- Viola orbiculata -Round-leaved violet, Darkwoods violet*
- Woodsia oregana -Woodsia*
- Woodsia scopulina -Rocky Mountain woodsia*
- Xanthocephalum sarothrae -Broom snakeweed*
- Xerophyllum tenax -Beargrass*
- Yucca glauca -Prairie yucca, Soapwell*
- Zygadenus elegans -Glaucous zygadenus*
- Zygadenus venenosus -Deadly zygadenus, Meadow death-camas*
*Species page has photo(s).
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