Species Descriptions

Vascular Plants

Includes all flowering plants, conifers, ferns and fern-allies.

Browse by genus:
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

Genus names beginning with O:

27 genera
60 species
20 subspecies and varieties

Show only taxa with photos

Odontites (1 species)

Oemleria (1 species)

Oenanthe (1 species)

Oenothera (8 species)

Olsynium (1 species)

Onobrychis (1 species)

Ononis (1 species)

Onopordum (1 species)

Ophioglossum (1 species)

Oplopanax (1 species)

Opuntia (2 species)

Oreopteris (1 species)

Oreostemma (1 species)

Origanum (1 species)

Ornithogalum (2 species)

Orobanche (1 species)

Orthilia (1 species)

Orthocarpus (5 species)

Oryzopsis (1 species)

Osmorhiza (4 species)

Osmunda (1 species)

Oxalis (7 species)

Oxybasis (4 species)

Oxyria (1 species)

Oxytheca (1 species)

Oxytropis (3 species)

Ozomelis (3 species)