Rhytidocaulon is a plant genus in the family Apocynaceae, first described in 1962. It is native to northeastern Africa and the Arabian Peninsula Species 1. \n* Rhytidocaulon paradoxum P.R.O.Bally - Ethiopia 2. \n* Rhytidocaulon piliferum Lavranos - Somalia 3. \n* Rhytidocaulon richardianum Lavranos - Somalia 4. \n* Rhytidocaulon subscandens P.R.O.Bally - Somalia, Ethiopia 5. \n* Rhytidocaulon tortum (N.E.Br.) M.G.Gilbert - Arabiaspecies with undetermined affinities 1. \n* Rhytidocaulon arachnoideum 2. \n* Rhytidocaulon baricum 3. \n* Rhytidocaulon ciliatum 4. \n* Rhytidocaulon fulleri 5. \n* Rhytidocaulon macrolobum 6. \n* Rhytidocaulon mccoyi 7. \n* Rhytidocaulon pseudosubscandens 8. \n* Rhytidocaulon sheilae 9. \n* Rhytidocaulon specksii 10. \n* Rhytidocaulon splendidum