This plant is also known as Stultitia conjuncta, but in 1978 it was moved to Orbeanthus. Recently, Peter Bruyns, one of the top Stapelia people, has placed it in Orbea, but there is a lot of movement in the naming of Stapelias, so it is entirely possible that it will be moved back to Orbeanthus. This genus contains only two species; the other one being Orbeanthus hardyi.
It is not a common plant in cultivation, but is very suitable for a hanging pot; the stems can grow up to 50 cm in length and are greyish green mottled with darker green. The flowers are cup-shaped and look similar to those of Hoya archboldiana, the colour being white with a red centre. The flowers are produced singly or in pairs, mainly in the summer.
It requires a well-drained soil, preferably mixed with grit. Propagation is by seed or cuttings. Cuttings need to dry for a couple of days before being put in the soil to avoid rot, as is the case with most succulents. Bottom-heat is preferred to speed up rooting. The plants can be grown either in full sun or shade, but you will get more mottling on the stem if they are kept in the sun.

Orbeanthus conjunctus

Orbeanthus conjunctus

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In the latest Asklepios, number 110, there was a very interesting article about Periploca graeca, a vigorous climber. This plant is one I have owned for many years and it grows extremely well outside here in the Netherlands, taking all that the weather can throw at it. It has survived temperatures down to -10°C.
My plant was removed from our garden at home and replanted at the nursery. Some root fragments must have been left behind, because there is now a smaller plant growing on the original spot which suggests that this species can be propagated by root cuttings. But I prefer to take stem cuttings which root fairly easily.
The plant flowers extremely well, producing hundreds of flowers every year, but no seed at all. It could be that I need a second clone of this plant or that the insect pollinator is not present in The Netherlands. The plant is available from specialist nurseries and can be added to the few species of asclepiads that can be grown outside in all weather conditions.
 
Link to the Asclepiad Society

Periploca graeca

A number of pictures of Cynanchiums and Sarcostemmas have been added to the website. Most are just photographs of the stems as they have not yet flowered. Some people will think them utterly boring, but there are others who disagree; the choice is yours.