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 |
| Oldenlandia boscii | Bosc's Mille Graines | |
| Oldenlandia corymbosa | Flat-top Mille Graines | |
| Oligoneuron nitidum | Shiny Goldenrod | |
| Oligoneuron rigidum | Stiff Goldenrod Hard-leaf Goldenrod | |
| Oligoneuron rigidum var. humile | Stiff Goldenrod | |
| Oligoneuron rigidum var. rigidum | Stiff Goldenrod | |
| Onosmodium bejariense | Soft-hair Marbleseed | |
| Onosmodium bejariense var. bejariense | Soft-hair Marbleseed False Gromwell | |
| Onosmodium bejariense var. occidentale | Western Marbleseed | |
| Onosmodium helleri | Heller's Marbleseed Marble-seed | |
| Onoclea sensibilis | Sensitive Fern Bead Fern Sympathy Fern | |
| Ophioglossum californicum | California Adder's Tongue California Adder's-tongue California Adderstongue | |
| Ophioglossum crotalophoroides | Bulbous Adder's-tongue | |
| Ophioglossum engelmannii | Limestone Adder's-tongue Limestone Adderstongue | |
| Operculina pinnatifida | Tansyleaf Lidpod Tansy-leaf Lidpod | |
| Ophioglossum polyphyllum | Large Adder's-tongue Large Adders Tongue Large Adderstongue | |
| Orontium aquaticum | Goldenclub Neverwet | |
| Orbexilum pedunculatum | Sampson's Snakeroot | |
| Orbexilum pedunculatum var. pedunculatum | Sampson's Snakeroot | |
| Orbexilum simplex | Singlestem Leather-root | |
| Osmunda cinnamomea | Cinnamon Fern | |
| Osmunda cinnamomea var. cinnamomea | Cinnamon Fern | |
| 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 | |
| scientific name | common name(s) | image gallery |
