Orbea semitubiflora (L.E.Newton) Bruyns
Angolluma semitubiflora, Ceropegia semitubiflora, Pachycymbium semitubiflorum
Orbea semitubiflora is a beautiful branching succulent with erect, spreading or decumbent stems that has unique purple markings or spots. Stems are grayish-green, 4-angled to rounded, up to 3.6 inches (9 cm) long, with prominent conical to subulate, up to 0.6 inches (1.5 cm) long tubercles. Clusters of flowers appear from summer to fall at the ends of the branches. Flowers are unique 5-pointed stars, up to 0.5 inches (1.3 cm) in diameter, with dark red-wine lobes and a yellowish corona.
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
Several species are fairly easy to grow. Others, often those with slightly hairy stems and the more unusual flowers, are more challenging and require careful watering (with some fertilizer) during the growing season and complete withdrawal of water during the winter months. A minimum winter temperature of 50 °F (10 °C) is acceptable, providing that plants are kept absolutely dry. A heated growing bench or incubator may help delicate plants to get through the colder months. However, many species live under shrubs in habitat and prefer light shade rather than full sun.
A gritty compost is essential, and clay pots are advisable for the more delicate species. Some growers prefer a mineral-only compost to minimize the chance of a fungal attack on the roots. A layer of grit on the surface of the compost prevents moisture from accumulating around the base of the stems.
Keeping Stapelias and their roots free of pests such as mealybugs is the real key to success as fungal attack often occurs as a result of damage to stems by an insect.
Learn more at How to Grow and Care for Stapelia.
Orbea semitubiflora is native to Tanzania (Arusha Province).
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