Ononis - Notes

Of the several shrubs in this genus, fruticosa, growing up to two feet high, with purple flowers in summer, is the best known; it is deciduous, and suitable for the rock garden. Rotundifolia, a dwarf shrub with rose flowers in summer, is also met with. Ordinary soil.

Osage Orange - Notes

See Madura.

Osmanthus - Notes

Useful evergreens, thriving in town and seaside gardens and good for winter bedding. The most important is ilicifolius, which is generally offered as a species, although really a variety of Aquifolium; it is a shrub growing up to four feet high, with dark, Holly-like leaves and white flowers in August. There are silver-variegated and golden variegated forms of ilicifolius, also a dark, purpureus. My rtifolius has no spines. The species fragrans is the same as Oleafragrans. The Osmanthuses do best in sandy loam.

Osteomeles - Notes

Anthyllidifolia is an evergreen growing up to three feet high, with white flowers in summer, but it is only safe out of doors in mild districts. Loam.

Othera - Notes

Japonica is the same as Ilex intégra, an evergreen with white flowers in summer.

Oxycoccus - Notes

Macrocarpus, a creeping shrub with pink flowers in May, followed by fruits, is the American Cranberry. Palustris (syn. vulgaris) is the common Cranberry. Moist peat.

Oxydendron - Notes

Arboreum, a tree growing up to thirty feet high, with white flowers in summer, is the same as Andromeda arborea. Moist peat.

Ozothamnus - Notes

Rosmarinifolius is a half-hardy evergreen with yellow flowers. Loam and peat. It is now united to Helichrysum by botanists.