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 pilosella ssp. pilosella | Meadow Evening Primrose Meadow Evening-primrose Prairie Sundrops | |
| Oenothera speciosa | Pink Evening Primrose Showy Evening Primrose Mexican Evening Primrose Showy Primrose Pink Ladies Buttercups Pink Buttercups | |
| Oenothera triloba | Stemless Evening-primrose Stemless Evening Primrose | |
| Oenothera villosa | Hairy Evening Primrose | |
| Oenothera villosa ssp. villosa | Hairy Evening-primrose | |
| Oldenlandia boscii | Bosc's Mille Graines | |
| Oligoneuron rigidum | Stiff Goldenrod Hard-leaf Goldenrod | |
| Oligoneuron rigidum var. rigidum | Stiff Goldenrod | |
| Oldenlandia uniflora | Clustered Mille Graines | |
| Onosmodium bejariense | Soft-hair Marbleseed | |
| Onosmodium bejariense var. hispidissimum | Softhair Marbleseed | |
| Onosmodium bejariense var. occidentale | Western Marbleseed | |
| Onoclea sensibilis | Sensitive Fern Bead Fern Sympathy Fern | |
| Onosmodium virginianum | Wild Job's-tears Virginia False Gromwell Eastern False Gromwell Virginia Marbleseed | |
| Ophioglossum engelmannii | Limestone Adder's-tongue Limestone Adderstongue | |
| Oplismenus hirtellus | Basketgrass | |
| Oplismenus hirtellus ssp. setarius | Basketgrass | |
| Opuntia humifusa | Low Prickly Pear Smooth Prickly Pear Devil's Tongue | |
| Ophioglossum petiolatum | Longstem Adder's-tongue | |
| Ophioglossum pusillum | Northern Adder's-tongue | |
| Opuntia stricta | Erect Pricklypear | |
| Ophioglossum vulgatum | Southern Adder's-tongue Adder's-tongue Adder's-tongue Fern | |
| Orontium aquaticum | Goldenclub Neverwet | |
| Oryzopsis asperifolia | Roughleaf Ricegrass | |
| Orobanche ludoviciana | Louisiana Broomrape | |
| Orobanche ludoviciana ssp. ludoviciana | Louisiana Broomrape Sand Broomrape Suksdorf's Broomrape | |
| Orbexilum onobrychis | French-grass | |
| Orbexilum pedunculatum | Sampson's Snakeroot | |
| Orbexilum pedunculatum var. psoralioides | Eastern Sampson's Snakeroot | |
| Orbexilum pedunculatum var. pedunculatum | Sampson's Snakeroot | |
| 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 | |
| Osmanthus americanus | American Olive Devilwood Wild Olive | |
| Osmanthus americanus var. americanus | American Devilwood American Olive Devilwood | |
| Osmunda cinnamomea | Cinnamon Fern | |
| Osmunda cinnamomea var. cinnamomea | Cinnamon Fern | |
| Osmunda cinnamomea var. glandulosa | Cinnamon Fern Osmonde Cannelle | |
| Osmorhiza claytonii | Clayton's Sweetroot Hairy Sweet-cicely Sweet Jarvil | |
| Osmunda claytoniana | Interrupted Fern | |
| Osmorhiza longistylis | Longstyle Sweetroot Aniseroot Sweet-cicely Wild Licorice | |
| Osmunda regalis | Royal Fern | |
| Osmunda regalis var. spectabilis | Royal Fern | |
| Osmunda ×ruggii | Osmunda | |
| Ostrya virginiana | Eastern Hop-hornbeam American Hop-hornbeam Woolly Hop-hornbean Eastern Ironwood Roughbark Ironwood Ironwood Deerwood Leverwood | |
| Oxydendrum arboreum | Sourwood Sorrel Tree | |
| Oxalis dillenii | Slender Yellow Wood Sorrel Yellow Wood Sorrel Yellow Woodsorrel | |
| Oxypolis filiformis | Water Cowbane | |
| Oxalis grandis | Great Yellow Woodsorrel Large Yellow Wood Sorrel | |
| Oxalis montana | Mountain Woodsorrel Northern Wood Sorrel | |
| scientific name | common name(s) | image gallery |
