Rhytidocaulon

Rhytidocaulon is a plant genus in the family Apocynaceae, first described in 1962. It is native to northeastern Africa and the Arabian Peninsula. Species Species accepted by the Plants of the World Online as of February 2023: Rhytidocaulon arachnoideum Rhytidocaulon baricum Rhytidocaulon ciliatum Rhytidocaulon elegantissimum Rhytidocaulon fulleri Rhytidocaulon macrolobum Rhytidocaulon mccoyi Rhytidocaulon molamatarense Rhytidocaulon paradoxum - Ethiopia Rhytidocaulon piliferum - Somalia Rhytidocaulon pseudosubscandens Rhytidocaulon richardianum - Somalia Rhytidocaulon sheilae Rhytidocaulon specksii Rhytidocaulon splendidum Rhytidocaulon subscandens - Somalia, Ethiopia Rhytidocaulon tortum - Arabia Taxonomy Phylogenetic studies have shown the genus to be monophyletic, and most closely related to the genus Echidnopsis which inhabits the same region. Marginally more distantly related is a sister branch comprising the genus Pseudolithos and the widespread Caralluma stapeliads of North Africa.

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