Origin and Habitat: Somalia (Northeast Tropical Africa, Africa)
Type locality: Nugaal Province, east of the village of Eyl, on the limestone plateau overlooking the Indian Ocean, 100–150 metres above sea level.
Habitat and ecology: Dorstenia horwoodiiSN|16419]]SN|16419]] grows nested in rock cracks and very small holes on top of huge boulders, on the limestone plateau.

• Dorstenia horwoodii Rzepecky

• Dorstenia foetida Schweinf.
• Kosaria foetida Forssk.
• Dorstenia arabica Hemsl.
• Dorstenia crispa Engl.
• Dorstenia forskalii (J.F.Gmel.)
• Cosaria forskalii J.F.Gmel.
• Kosaria forskalii J.F.Gmel.
• Dorstenia horwoodii Rzepecky
• Dorstenia phillipsiae Hook.f.
• Dorstenia radiata Lamarck
• Dorstenia sp.

• Dorstenia foetida subs. lancifolia (Rendle) Friis
• Dorstenia crispa var. lancifolia Rendle
• Dorstenia crispa var. pachypoda Chiov.

• Dorstenia foetida subs. obovata (A.Rich.) Friis
• Dorstenia foetida var. obovata (A.Rich.) Engl.
• Dorstenia obovata Hochst. ex A.Rich.
• Kosaria obovata (A.Rich.) Schweinf. ex Solms

Description: Dorstenia horwoodiiSN|16417]]SN|16419]] is small succulent growing generally included within (as a synonym of) Dorstenia foetidaSN|16419]]SN|16417]], suggesting that there is not really a fundamental difference between the two. In habitat it grows to about 5 cm tall (more in cultivation). It produces a new flush of silvery green, remarkably nice, decorative crisped and crenulate leaves in spring turning to autumnal golden before they shed. The inflorescences are held on long straight erect spreading peduncles (flower stalks) twice as long as leaves. These are greenish, flat, disk-like in longitudinal section with a row of star-like appendages on the margin of the receptacle. The receptacle bears both the ovaries of the female flowers, and the anthers of the male flowers. Unlike D. foetida that often grows as an annual or bi-annual D. horwoodii remains strongly perennial.
Derivation of specific name: This species was collect by Frank (Francis) Horwood in Somalia and hence the species name. Two other species have been dedicated to him Pseudolithos horwoodiiSN|12770]]SN|12770]] P.R.O. Bally & Lavranos 1974 and Sansevieria francisiiSN|32210]]SN|32210]] Chahin. 1995.

Notes: This species was collect by Frank Horwood in Somalia and hence the species name.

Bibliography: Major references and further lectures
1) Dorstenia horwoodii in: blogspot, Plants for life, thursday. March 12 2009 <http://tulear.blogspot.it/2009/03/dorstenia-horwoodii.html>
2) Alain Rzepecky “Dorstenia horwoodii Rzepecky sp. nov. from Nudum to Novum, a Fortyish Year Hiatus” Cactus and Succulent Journal 88(2):66-74. 2016

Cultivation and Propagation: Dorstenia horwoodiiSN|16419]]SN|16419]] needs bright light or partial to full shade, with warm temperatures and a well-drained soil mix that must not remain soggy for too long. During the growing season, the plants appreciate a fair amount of water but allow the soil to dry slightly between watering, making sure that they never dry out completely. They have to be kept in a rather high air humidity. They are fertilized once during the growing season with a balanced fertilizer diluted to ½ the strength recommended on the label. During the winter months they tend to go at least partially dormant and will exhibit some leaf loss. During this period, they should be given very little water.
Propagation: Dorstenias are usually propagated by seed. Seed germinate readily at 21° C. They can also be propagated by cuttings.