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 |
| Oryctes nevadensis | Nevada Diggerplant Nevada Oryctes | |
| Orthocarpus pachystachyus | Shasta Owl's Clover Shasta Owl's-clover Shasta Owl-clover Shasta Owlclover | |
| Orobanche pinorum | Conifer Broomrape Pinewoods Broom Rape | |
| 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 | |
| Orthocarpus tenuifolius | Thin-leaf Owl-clover Thin-leaf Owlclover Thin-leaved Owl's Clover Thin-leaved Owl’s-clover Thinleaved Owl's-clover | |
| Orochaenactis thysanocarpha | California Mountainpincushion Mountain Pincushion | |
| Orthocarpus tolmiei | Tolmie's Owl's Clover Tolmie's Owl's-clover Tolmie's Owl-clover Tolmie's Owlclover | |
| Orthocarpus tolmiei ssp. holmgreniorum | Noel's Owl's Clover Noel's Owl's-clover Noel's Owl-clover Noel's Owlclover | |
| Orthocarpus tolmiei ssp. tolmiei | Tolmie's Owl's Clover Tolmie's Owl's-clover Tolmie's Owl-clover Tolmie's Owlclover | |
| Orobanche uniflora | One-flowered Broomrape One-flower Cancer Root | |
| Orobanche valida | Rock Creek Broom Rape Rock Creek Broomrape | |
| Orobanche vallicola | Hillside Broomrape Valley Broom Rape | |
| Orobanche valida ssp. howellii | Howell's Broom Rape Howell's Broomrape | |
| Orobanche valida ssp. valida | Rock Creek Broom Rape Rock Creek Broomrape | |
| Oxytheca caryophylloides | Chickweed Oxytheca Chickweed Starry Puncturebract | |
| Oxalis grandis | Great Yellow Woodsorrel Large Yellow Wood Sorrel | |
| Oxystylis lutea | Spiny Caper | |
| Oxytheca perfoliata | Roundleaf Oxytheca Round-leaf Puncturebract | |
| Palafoxia arida | Desert Palafox Spanish Needle | |
| Palafoxia arida var. arida | Desert Needle Desert Palafox | |
| Palafoxia arida var. gigantea | Giant Spanish Needle | |
| Palafoxia callosa | Small Palafox Small Palafoxia | |
| Paronychia chartacea | Paper Nailwort | |
| Paronychia chartacea ssp. chartacea | Paper Nailwort Papery Whitlow-wort | |
| scientific name | common name(s) | image gallery |
