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Rhytidocaulon macrolobum

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Scientific Name

Rhytidocaulon macrolobum Lavranos

Scientific Classification

Family: Apocynaceae
Subfamily: Asclepiadoideae
Genus: Rhytidocaulon

Description

Rhytidocaulon macrolobum is a small succulent with light to dark brown branched stems that become grayish-brown as they age. They are cylindrical with a rough, wrinkled, aged texture. The main stem is up to 12 inches (30 cm) long and up to 0.8 inches (2 cm) in diameter. Branches are shorter and more slender. Leaves are small and lanceolate to narrowly triangular. Flowers are up to 0.6 inches (1.5 cm) across, variable in color and banding. They are usually black or dark-maroon, but also dark-purple, dark green-brown or green inside, basally cream-colored cross-banded with red-brown, and with purple frilly vibratile hairs on the margins. The center of the flowers often with red tones.

Rhytidocaulon macrolobum

Photo by Evelyn Durst via juzaphoto.com

Hardiness

USDA hardiness zone 9a to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).

How to Grow and Care

Stapeliads are relatively easy to grow. They should be treated as an outdoor plant as they will easily rot indoors and cannot flower without exposure to outdoor temperature fluctuations. They should be grown under cover so that watering can be controlled. They require a reasonable amount of sunlight to promote flowering and maintain a well-shaped plant. Very shady positions will produce very poor flowering. Stapeliads come from climates where they survive extremely high temperatures in the summer months, so most growth is in spring and autumn, with flowering in autumn when the weather starts to cool down. In the growing season, water in moderation when needed, making sure soil is fairly dried out between waterings. Do not water between November 1 and March 1.

The easiest and best way to propagate Stapeliads is from stem cuttings, which can be taken virtually throughout the year. Using the seed is also a method of propagation. See more at How to Grow and Care for Stapeliads.

Origin

Native to Saudi Arabia, Yemen, and Somalia.

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