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 # ''Rhytidocaulon paradoxum'' P.R.O.Bally - Ethiopia # ''Rhytidocaulon piliferum'' Lavranos - Somalia # '' Rhytidocaulon richardianum'' Lavranos - Somalia # '' Rhytidocaulon subscandens'' P.R.O.Bally - Somalia, Ethiopia # '' Rhytidocaulon tortum'' (N.E.Br.) M.G.Gilbert - Arabia ;species with undetermined affinities ;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 ''Caralluma'' is a genus of flowering plants in the family Apocynaceae, consisting of about 120 species. In 1795 William Roxburgh published the name '' Stapelia adscendens'' for a plant found in India. He commented that the name for ...
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