Index of plants by genus
Species | Common Name | Family |
Oclemena acuminata | Whorled Aster | Asteraceae |
Oclemena nemoralis | Bog Aster | Asteraceae |
Oenothera biennis | Common Evening Primrose | Onagraceae |
Oenothera clelandii | Sand Evening Primrose | Onagraceae |
Oenothera laciniata | Cutleaf Evening Primrose | Onagraceae |
Oenothera parviflora | Northern Evening Primrose | Onagraceae |
Oenothera perennis | Small Sundrops | Onagraceae |
Oenothera pilosella | Prairie Sundrops | Onagraceae |
Onoclea sensibilis | Sensitive Fern | Dryopteridaceae |
Ophioglossum pusillum | Northern Adder's Tongue | Ophioglossaceae |
Opuntia fragilis | Brittle Prickly Pear | Cactaceae |
Opuntia humifusa | Eastern Prickly Pear | Cactaceae |
Opuntia macrorhiza | Plains Prickly Pear | Cactaceae |
Orobanche uniflora | One-flowered Cancer Root | Orobanchaceae |
Orontium aquaticum | Golden Club | Araceae |
Orthilia secunda | One-sided Wintergreen | Ericaceae |
Oryzopsis racemosa | Black-seeded Rice Grass | Poaceae |
Osmorhiza claytonii | Hairy Sweet Cicely | Apiaceae |
Osmorhiza longistylis | Sweet Cicely | Apiaceae |
Osmunda cinnamomea | Cinnamon Fern | Osmundaceae |
Osmunda claytonia | Interrupted Fern | Osmundaceae |
Osmunda regalis | Royal Fern | Osmundaceae |
Ostrya virginiana | Hop-hornbeam | Betulaceae |
Oxalis montana | Mountain Woodsorrel | Oxalidaceae |
Oxalis stricta | Yellow Woodsorrel | Oxalidaceae |
Oxalis violacea | Violet Woodsorrel | Oxalidaceae |
Oxydendrum arboreum | Sourwood | Ericaceae |
© 2004 Michael Hough