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 |
| Orobanche cooperi | Desert Broomrape Spike Broomrape | |
| Orobanche fasciculata | Clustered Broomrape Yellow Broomrape | |
| Orobanche ludoviciana | Louisiana Broomrape | |
| Orobanche ludoviciana ssp. ludoviciana | Louisiana Broomrape Sand Broomrape Suksdorf's Broomrape | |
| Orobanche ludoviciana ssp. multiflora | Manyflower Broomrape | |
| Orobanche multicaulis | Spiked Broomrape | |
| Orbexilum pedunculatum | Sampson's Snakeroot | |
| Orbexilum pedunculatum var. pedunculatum | Sampson's Snakeroot | |
| Orobanche riparia | River Broom Rape River Broom-rape River Broomrape | |
| Orbexilum simplex | Singlestem Leather-root | |
| 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 | |
| Ostrya chisosensis | Chisos Hophornbeam Chisos Hop-hornbeam Big Bend Hop-hornbeam | |
| Osmunda cinnamomea | Cinnamon Fern | |
| Osmunda cinnamomea var. cinnamomea | Cinnamon Fern | |
| Ostrya knowltonii | Ironwood Knowlton's Hop-hornbeam Knowlton's Hophornbeam Western Hop-hornbeam | |
| Osmorhiza longistylis | Longstyle Sweetroot Aniseroot Sweet-cicely Wild Licorice | |
| Osmorhiza mexicana | Mexican Sweetcicely Mexican Sweet Cicely Mexican Sweetroot Livermore Sweet-cicely | |
| Osmorhiza mexicana ssp. bipatriata | Mexican Sweetcicely Mexican Sweet Cicely Mexican Sweetroot Livermore Sweet-cicely | |
| Osmunda regalis | Royal Fern | |
| Osmunda regalis var. spectabilis | Royal Fern | |
| Ostrya virginiana | Eastern Hop-hornbeam American Hop-hornbeam Woolly Hop-hornbean Eastern Ironwood Roughbark Ironwood Ironwood Deerwood Leverwood | |
| Oxalis albicans | Radishroot Woodsorrel | |
| Oxalis alpina | Alpine Woodsorrel Alpine Wood-sorrel | |
| Oxalis albicans ssp. albicans | Radishroot Woodsorrel Western Yellow Wood-sorrel | |
| Oxalis albicans ssp. pilosa | Hairy Western Wood-sorrel Hairy Wood Sorrel Radishroot Woodsorrel | |
| Oxycaryum cubense | Cuban Bulrush | |
| Oxalis dichondrifolia | Peonyleaf Woodsorrel | |
| Oxalis dillenii | Slender Yellow Wood Sorrel Yellow Wood Sorrel Yellow Woodsorrel | |
| Oxalis drummondii | Drummond's Wood-sorrel Large-leaf Wood-sorrel Drummond's Woodsorrel | |
| Oxypolis filiformis | Water Cowbane | |
| Oxalis frutescens | Shrubby Wood-sorrel Shrubby Woodsorrel | |
| Oxalis frutescens ssp. angustifolia | Shrubby Wood-sorrel Shrubby Woodsorrel | |
| Oxytropis lambertii | Purple Locoweed | |
| Oxytropis lambertii var. articulata | Purple Locoweed Locoweed | |
| Oxalis priceae | Tufted Yellow Woodsorrel | |
| Oxalis priceae ssp. texana | Texas Wood-sorrel Texas Woodsorrel | |
| Oxypolis rigidior | Stiff Cowbane | |
| Oxytropis sericea | White Locoweed Silky Locoweed | |
| Oxytropis sericea var. sericea | White Locoweed | |
| Oxalis stricta | Common Yellow Oxalis Yellow Wood-sorrel Upright Yellow Wood-sorrel Yellow Woodsorrel | |
| Oxypolis ternata | Piedmont Cowbane | |
| Oxalis violacea | Violet Woodsorrel Violet Wood-sorrel | |
| Parkinsonia aculeata | Retama Paloverde Mexican Paloverde Jerusalem Thorn Horsebean Lluvia De Oro | |
| Paspalum acuminatum | Brook Crown Grass Brook Crowngrass Canoegrass | |
| Passiflora affinis | Bracted Passionflower Passion Flower | |
| Panicum alatum | Winged Panic Grass Winged Panicgrass | |
| Panicum alatum var. minus | Winged Panic Grass Winged Panicgrass | |
| Panicum amarum | Bitter Panicgrass Beachgrass Coastal Panic Grass | |
| scientific name | common name(s) | image gallery |
