Combination search
Looking for commercially available native plant species suitable to your state or region, try the Recommended Species page.
| scientific name | common name(s) | image gallery |
| Oenothera flava | Yellow Evening-primrose Long-tube Evening-primrose Shortfin Evening-primrose Yellow Evening Primrose | |
| Oenothera flava ssp. flava | Long-tubed Evening-primrose Yellow Evening Primrose Yellow Evening-primrose | |
| Oenothera grandis | Showy Evening-primrose Largeflower Eveningprimrose Showy Eveningprimrose | |
| Oenothera harringtonii | Colorado Springs Evening Primrose Colorado Springs Evening-primrose Arkansas Valley Evening Primrose | |
| Oenothera howardii | Howard's Evening Primrose Howard's Evening-primrose | |
| Oenothera latifolia | Mountain Evening Primrose Mountain Evening-primrose Pale Evening-primrose | |
| Oenothera longissima | Long-stem Evening-primrose Longstem Evening Primrose Longstem Evening-primrose | |
| Oenothera nuttallii | Nuttall's Evening-primrose | |
| Oenothera pallida | Pale Evening-primrose | |
| Oenothera pallida ssp. pallida | Pale Evening Primrose Pale Evening-primrose | |
| Oenothera pallida ssp. runcinata | White Sands Evening Primrose | |
| Oenothera pallida ssp. trichocalyx | Pale Evening Primrose Pale Evening-primrose | |
| Oenothera suffrutescens | Scarlet Beeblossom Scarlet Gaura | |
| Oenothera villosa | Hairy Evening Primrose | |
| Oenothera villosa ssp. strigosa | Hairy Evening-primrose Common Evening-primrose Common Evening Primrose | |
| Oenothera villosa ssp. villosa | Hairy Evening-primrose | |
| Oligoneuron album | Prairie Goldenrod Prairie Flat-top-goldenrod Upland White Aster Stiff Aster Sneezewort Aster | |
| Oligoneuron rigidum | Stiff Goldenrod Hard-leaf Goldenrod | |
| Oligoneuron rigidum var. humile | Stiff Goldenrod | |
| Onosmodium bejariense | Soft-hair Marbleseed | |
| Onosmodium bejariense var. occidentale | Western Marbleseed | |
| Onoclea sensibilis | Sensitive Fern Bead Fern Sympathy Fern | |
| Oonopsis engelmannii | Engelmann's False Goldenweed Engelmann's Goldenweed | |
| Oonopsis foliosa | Leafy False Goldenweed Leafy Goldenweed Leafy-bracted Goldenweed | |
| Oonopsis foliosa var. foliosa | Leafy False Goldenweed | |
| Oonopsis foliosa var. monocephala | Raven Ridge False Goldenweed | |
| Opuntia cymochila | Grassland Pricklypear | |
| Opuntia fragilis | Brittle Prickly Pear Fragile Prickly Pear Pygmy Prickly Pear Brittle Cactus | |
| Opuntia humifusa | Low Prickly Pear Smooth Prickly Pear Devil's Tongue | |
| Opuntia macrorhiza | Bigroot Prickly Pear Twist-spine Prickly Pear Common Prickly Pear Plains Prickly Pear | |
| Opuntia macrorhiza var. macrorhiza | Twistspine Pricklypear Plains Prickly Pear | |
| Opuntia phaeacantha | Tulip Prickly Pear Brownspine Prickly Pear Cactus Purple-fruited Prickly Pear Brown-spined Prickly Pear New Mexico Prickly Pear Desert Prickly Pear | |
| Opuntia polyacantha | Plains Prickly Pear Hair-spine Prickly Pear Nopal Peludito | |
| Opuntia polyacantha var. erinacea | Grizzlybear Pricklypear Oldman Cactus Grizzly Prickly Pear Hedgehog Prickly Pear Mohave Prickly Pear Grizzly Bear Pricklypear | |
| Opuntia polyacantha var. polyacantha | Hairspine Pricklypear Utah Grizzlybear Pricklypear | |
| Oreoxis alpina | Alpine Oreoxis | |
| Oreoxis alpina ssp. alpina | Alpine Oreoxis Tundra Alpine-parsley Tundra Alpine Parsley | |
| Oreoxis alpina ssp. puberulenta | Alpine Oreoxis Alpine-parsley Alpine Parsley | |
| Oryzopsis asperifolia | Roughleaf Ricegrass | |
| Oreoxis bakeri | Baker's Alpineparsley Baker's Alpine-parsley Baker's Alpine Parsley | |
| Orobanche fasciculata | Clustered Broomrape Yellow Broomrape | |
| Oreoxis humilis | Rocky Mountain Alpineparsley Rocky Mountain Alpine-parsley Pikes Peak Spring-parsley Pikes Peak Spring Parsley | |
| Orogenia linearifolia | Great Basin Indian Potato | |
| Orobanche ludoviciana | Louisiana Broomrape | |
| Orthocarpus luteus | Yellow Owl's-clover | |
| Orobanche ludoviciana ssp. ludoviciana | Louisiana Broomrape Sand Broomrape Suksdorf's Broomrape | |
| Orobanche ludoviciana ssp. multiflora | Manyflower Broomrape | |
| Oreochrysum parryi | Parry's Goldenrod | |
| Orthocarpus purpureoalbus | Purple-white Owl-clover Purplewhite Owl's Clover Purplewhite Owl's-clover Purplewhite Owlclover | |
| Orobanche riparia | River Broom Rape River Broom-rape River Broomrape | |
| Orthilia secunda | Sidebells Wintergreen One-sided Wintergreen | |
| Orobanche uniflora | One-flowered Broomrape One-flower Cancer Root | |
| Osmorhiza berteroi | Sweetcicely Mountain Sweet-cicely | |
| Osmorhiza depauperata | Bluntseed Sweetroot | |
| Osmorhiza longistylis | Longstyle Sweetroot Aniseroot Sweet-cicely Wild Licorice | |
| Osmorhiza occidentalis | Western Sweetroot Western Sweet Cicely Mountain Sweet Cicely Sierran Sweet-cicely Sweetanise | |
| Oxytenia acerosa | Copperweed | |
| Oxalis albicans | Radishroot Woodsorrel | |
| Oxalis albicans ssp. albicans | Radishroot Woodsorrel Western Yellow Wood-sorrel | |
| Oxytropis besseyi | Bessey's Locoweed | |
| Oxytropis besseyi var. obnapiformis | Bessey's Locoweed | |
| Oxytropis borealis | Boreal Locoweed | |
| Oxytropis borealis var. viscida | Viscid Locoweed | |
| Oxytropis campestris | Field Locoweed Northern Field Oxytrope Northern Yellow Locoweed | |
| Oxytropis campestris var. cusickii | Cusick's Locoweed | |
| Oxytropis campestris var. spicata | Field Locoweed | |
| Oxytropis deflexa | Nodding Locoweed | |
| Oxytropis deflexa var. pulcherrima | Nodding Locoweed | |
| Oxytropis deflexa var. sericea | Blue Nodding Locoweed | |
| Oxalis dillenii | Slender Yellow Wood Sorrel Yellow Wood Sorrel Yellow Woodsorrel | |
| Oxyria digyna | Alpine Mountainsorrel Mountain Sorrel | |
| Oxypolis fendleri | Fendler's Cowbane | |
| Oxytropis lambertii | Purple Locoweed | |
| Oxytropis lambertii var. bigelovii | Purple Locoweed | |
| Oxytropis lambertii var. lambertii | Purple Locoweed Lambert's Locoweed | |
| Oxytropis monticola | Yellowflower Locoweed | |
| Oxytropis multiceps | Nuttall's Oxytrope | |
| Oxytropis parryi | Parry's Oxytrope | |
| Oxytropis podocarpa | Stalkpod Locoweed | |
| Oxytropis sericea | White Locoweed Silky Locoweed | |
| Oxytropis sericea var. sericea | White Locoweed | |
| Oxytropis splendens | Showy Locoweed | |
| Oxalis stricta | Common Yellow Oxalis Yellow Wood-sorrel Upright Yellow Wood-sorrel Yellow Woodsorrel | |
| Oxalis violacea | Violet Woodsorrel Violet Wood-sorrel | |
| Parthenium alpinum | Alpine Feverfew | |
| Packera cana | Woolly Groundsel Silver-woolly Groundsel Gray Ragwort | |
| Panicum capillare | Witchgrass | |
| Packera crocata | Saffron Ragwort | |
| Packera debilis | Weak Groundsel | |
| Paronychia depressa | Depressed Whitlow-wort Spreading Nailwort | |
| Panicum dichotomiflorum | Fall Panicgrass Fall Panic Grass | |
| Packera dimorphophylla | Splitleaf Groundsel | |
| Panicum dichotomiflorum var. dichotomiflorum | Fall Panic Grass Fall Panicgrass | |
| Packera dimorphophylla var. dimorphophylla | Splitleaf Groundsel | |
| Packera dimorphophylla var. intermedia | Splitleaf Groundsel | |
| Packera fendleri | Fendler's Ragwort | |
| Parnassia fimbriata | Fringed Grass Of Parnassus Fringed Parnassia | |
| Parryella filifolia | Common Dunebroom | |
| Parnassia fimbriata var. fimbriata | Fringed Grass of Parnassus Fringed Grass-of-Parnassus Rocky Mountain Parnassia | |
| Panicum hallii | Hall's Panicgrass Hall's Panic Grass | |
| scientific name | common name(s) | image gallery |
