San Francisco Bay Area Plant Encyclopedia
- Oreocereus trollii
- Origanum “Amethyst Falls”
- Origanum “Herrenhausen”
- Origanum “Hopley’s Purple”
- Origanum “Kent Beauty”
- Origanum microphyllum hybrid
- Origanum “Monterey Bay”
- Ornithogalum caudatum
- Ornithogalum dubium
- Ornithogalum fimbriatum
- Ornithogalum magnum
- Ornithogalum saundersiae
- Orostachys iwarenge
- Orostachys japonica
- Oroya peruviana
- Ortegocactus macdougallii
- Oscularia caulescens
- Oscularia deltoides
- Osteospermum “3D Berry White”
- Osteospermum “3D Double Purple”
- Osteospermum “3D Sunburst”
- Osteospermum “4D Pink”
- Osteospermum “4D Violet”
- Osteospermum “Astra Orange”
- Osteospermum “Astra Pink Spoon”
- Osteospermum “Astra Purple Spoon”
- Osteospermum “Bright Lights White”
- Osteospermum “Dusky Rose”
- Osteospermum “Kardinal”
- Osteospermum “Lavender”