Oenothera albicaulis --- whitest evening-primrose
Oenothera caespitosa --- tufted evening-primrose
Oenothera caespitosa ssp. caespitosa --- tufted evening-primrose
Oenothera caespitosa ssp. macroglottis --- tufted evening-primrose
Oenothera caespitosa ssp. marginata --- tufted evening-primrose
Oenothera canescens --- spotted evening-primrose
Oenothera coronopifolia --- crownleaf evening-primrose
Oenothera elata --- Hooker's evening-primrose
Oenothera elata ssp. hirsutissima --- Hooker's evening-primrose
Oenothera flava --- yellow evening-primrose
Oenothera flava ssp. flava --- yellow evening-primrose
Oenothera howardii --- Howard's evening-primrose
Oenothera laciniata --- cutleaf evening-primrose
Oenothera latifolia --- mountain evening-primrose
Oenothera nuttallii --- Nuttall's evening-primrose
Oenothera pallida --- pale evening-primrose
Oenothera pallida ssp. pallida --- pale evening-primrose
Oenothera pallida ssp. trichocalyx --- pale evening-primrose
Oenothera villosa --- hairy evening-primrose
Oenothera villosa ssp. strigosa --- hairy evening-primrose
Oenothera villosa ssp. villosa --- hairy evening-primrose
Oligoneuron album --- prairie goldenrod
Oligoneuron rigidum --- stiff goldenrod
Oligoneuron rigidum var. humile --- stiff goldenrod
Onobrychis viciifolia --- sainfoin
Onopordum acanthium --- Scotch cottonthistle
Onosmodium molle --- softhair marbleseed
Onosmodium molle ssp. occidentale --- western marbleseed
Oonopsis foliosa --- leafy false goldenweed
Oonopsis foliosa var. foliosa --- leafy false goldenweed
Oonopsis multicaulis --- branched false goldenweed
Oonopsis wardii --- Ward's false goldenweed
Ophioglossum vulgatum --- southern adderstongue
Opuntia erinacea --- grizzlybear pricklypear
Opuntia erinacea var. utahensis --- Utah grizzlybear pricklypear
Opuntia fragilis --- brittle pricklypear
Opuntia fragilis var. fragilis --- brittle pricklypear
Opuntia macrorhiza --- twistspine pricklypear
Opuntia macrorhiza var. macrorhiza --- twistspine pricklypear
Opuntia polyacantha --- plains pricklypear
Opuntia polyacantha var. juniperina --- Juniper pricklypear
Opuntia polyacantha var. polyacantha --- hairspine pricklypear
Opuntia polyacantha var. rufispina --- hairspine pricklypear
Oreochrysum parryi --- Parry's goldenrod
Oreostemma alpigenum --- tundra aster
Oreostemma alpigenum var. haydenii --- tundra aster
Oreoxis alpina --- alpine oreoxis
Oreoxis alpina ssp. alpina --- alpine oreoxis
Orobanche corymbosa --- flat-top broomrape
Orobanche corymbosa ssp. corymbosa --- flat-top broomrape
Orobanche fasciculata --- clustered broomrape
Orobanche ludoviciana --- Louisiana broomrape
Orobanche ludoviciana ssp. ludoviciana --- Louisiana broomrape
Orobanche ludoviciana ssp. multiflora --- manyflower broomrape
Orobanche uniflora --- oneflowered broomrape
Orogenia linearifolia --- Great Basin Indian potato
Orthilia secunda --- sidebells wintergreen
Orthocarpus luteus --- yellow owl's-clover
Orthocarpus tolmiei --- Tolmie's owl's-clover
Orthocarpus tolmiei ssp. tolmiei --- Tolmie's owl's-clover
Oryzopsis asperifolia --- roughleaf ricegrass
Osmorhiza berteroi --- sweetcicely
Osmorhiza depauperata --- bluntseed sweetroot
Osmorhiza longistylis --- longstyle sweetroot
Osmorhiza occidentalis --- western sweetroot
Ostrya virginiana --- hophornbeam
Ostrya virginiana var. virginiana --- hophornbeam
Oxalis albicans --- radishroot woodsorrel
Oxalis albicans ssp. albicans --- radishroot woodsorrel
Oxalis stricta --- common yellow oxalis
Oxalis violacea --- violet woodsorrel
Oxypolis fendleri --- Fendler's cowbane
Oxyria digyna --- alpine mountainsorrel
Oxytheca dendroidea --- narrowleaf oxytheca
Oxytropis besseyi --- Bessey's locoweed
Oxytropis besseyi var. besseyi --- Bessey's locoweed
Oxytropis besseyi var. fallax --- Bessey's locoweed
Oxytropis besseyi var. obnapiformis --- Bessey's locoweed
Oxytropis besseyi var. ventosa --- Bessey's locoweed
Oxytropis borealis --- boreal locoweed
Oxytropis borealis var. viscida --- viscid locoweed
Oxytropis campestris --- field locoweed
Oxytropis campestris var. cusickii --- Cusick's locoweed
Oxytropis campestris var. spicata --- field locoweed
Oxytropis deflexa --- nodding locoweed
Oxytropis deflexa var. foliolosa --- nodding locoweed
Oxytropis deflexa var. sericea --- blue nodding locoweed
Oxytropis lagopus --- haresfoot locoweed
Oxytropis lagopus var. atropurpurea --- haresfoot locoweed
Oxytropis lagopus var. lagopus --- haresfoot locoweed
Oxytropis lambertii --- purple locoweed
Oxytropis lambertii var. bigelovii --- purple locoweed
Oxytropis lambertii var. lambertii --- purple locoweed
Oxytropis monticola --- yellowflower locoweed
Oxytropis multiceps --- Nuttall's oxytrope
Oxytropis nana --- Wyoming locoweed
Oxytropis parryi --- Parry's oxytrope
Oxytropis podocarpa --- stalkpod locoweed
Oxytropis riparia --- Oxus locoweed
Oxytropis sericea --- white locoweed
Oxytropis sericea var. sericea --- white locoweed
Oxytropis sericea var. speciosa --- white locoweed
Oxytropis splendens --- showy locoweed

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