| Oenothera rhombipetala Diamond petal primrose View 16 images |  |
| Oenothera speciosa Pink evening primrose View 102 images |  |
| Osmanthus americanus Devilwood View 2 images |  |
| Osmunda regalis Royal fern View 2 images |  |
| Ostrya virginiana Eastern hop-hornbeam View 10 images |  |
| Oxydendrum arboreum Sourwood View 16 images |  |
| Packera glabella Butterweed View 11 images |  |
| Parthenocissus quinquefolia Virginia creeper View 35 images |  |
| Panicum virgatum Switchgrass View 23 images |  |
| Penstemon murrayanus Scarlet beardtongue View 14 images |  |
