Stapelia lepida
Stems to 6″, starfish shaped carrion flowers to 3″
Soil
Orbea lutea ssp. vaga
6″ stems and stunning variable starfish shaped carrion flowers to 4″
Orbea schweinfurthii
Sprawling stems, many tiny carrion flowers.
Orbea variegata
Stapelia variegata
Variable, stems to 12″; speckled carrion flowers to 6″
Orbeanthus hardyi
Orbea hardyi
Low, creeping with trailing speckled stems. Grayish-green with mottled purple. Starfish-shaped carrion flowers with bowl-shaped center. Protect from frost.
Oreocereus celsianus
Tree cactus to 12ft. tall covered with long white hairs. Branches from the base. low growing.
Oreocereus doelzianus var. sericatus
Morawetzia sericata
Exceptionally attractive white-furred, broze-spined cactus from high altitudes where the fur protects it from scorching sunlight and frosts. Slow, but will clump with age, carmine colored tubular flowers.
Oreocereus ritteri
Fog hardy, slow basally clumping to 5ft x 10ft wide
Oreocereus trollii
Andean, fog hardy. Exceptionally attractive white-furred and bronze-spined cactus from high altitudes where the hairs will protect it from UV and frosts. Slowly clumping to 30″t. Red flowers.
Ornithogalum caudatum
Winter-growing bulb, 4″ caudex, w/strappy leaves to 3ft.
Ornithogalum dubium
Beautiful spring bulb in the Scilloideae subfamily. Summer dormant. Has large sprays of orange or yellow flowers in the spring, strappy leaves through the winter. Frost tender. Can be unplanted for winter, replanted in spring. Keep dry when dormant.
Ornithogalum fimbriatum
Beautiful spring bulb in the Scilloideae subfamily. Summer dormant. Has initial low sprays of flowers in late winter, and a 2nd tall bloom stalk with large sprays of white flowers in the spring, strappy leaves through the winter. Frost tender. Can be unplanted for winter, replanted in spring. Keep dry when dormant.
Ornithogalum saundersiae
Hyacinth bulb, 5ft. stalks w/white flowers, black centers Late winter blooming.
Orostachys iwarenge
Groundcover, lots of plantlets, pyramidal bloom stalks.
Orostachys japonica
Unusual rosette-forming succulent with pyramidal bloom stalks. Large clusters. Monocarpic, will bloom in the 2nd or 3rd year.
Oroya peruviana
Small, rare barrel to 8″ dia., pink flowers.
Ortegocactus macdougallii
Small, globular, to 2″across; black-tipped spines; requires limestone in soil.
Oscularia caulescens
Pairs of triangular leaves densely packed on stems. Blue-green leaves get purple edges in full sun. Reddish stems will get woody as they age. Small purple flowers in mid summer open in late afternoon heat. Grows 8-10″ tall, will spread 6 feet wide. Propagate by taking cuttings from new, soft stem tips only.
Oscularia deltoides
Low shrub; purple stems, boxy grey-green leaves. Winter-growing. Will get covered in small lavender daisy-like flowers in spring through the summer.
Othonna capensis
Small thickened oval leaves turn purple in sun. Low-growing groundcover succulent daisy (Asteraceae) with daisy-yellow flowers. Can be used in hanging baskets or rock gardens to trail.
Othonna capensis “Ruby Necklace”
Small thickened oval green leaves with purple trailing stems. Low-growing groundcover succulent daisy (Asteraceae) with daisy-yellow flowers. Can be used in hanging baskets or rock gardens to trail.
Othonna cyclophylla
Erect stems, leaves and flower stalks from the tips of the stems.
Othonna herrei x cremnophila
Thick stems, branches, squat and shrubby. Large thick green leaves. Large sprays of yellow flowers.
Othonna lobata
Small irregular caudex, lots of shrubby branches with strappy green leaves and white or yellow daisy flowers. Grows in rocky outcrops, often in sandy soils. Winter-spring flowers.
Othonna triplinervia
Small yellow daisy flowers. In the Aster Family. Forms a low round caudex topped with multiple branches. New leaves grow starting in October.
Oxalis adenophylla
Alpine, semi-succulent, with pink-tipped white flowers. Prefers full sun, but can handle some light shade.
Oxalis carnosa
Forms 2″ caudex, fleshy erect stems; grows full and bushy
Oxalis fabifolia
O. flava v. fabifolia
O. fabaefolia
Long strappy leaves, lemon-yellow flowers. Small bulbs, summer dormant.
Oxalis flava
Small succulent bulb with thickened leaves. Variable flowers – yellow, white and some purple. Rocky soils with some sand.
Winter growing, spring-summer flowers.
Oxalis flava v. lupinifolia
Small succulent bulb with thickened leaves. Rocky soils with some sand. Flowers range from white and yellow to full pink. Winter growing leaves, can bloom first in fall, or spring flowers before going dormant in summer.