Orestias is a genus of orchids. It has 4 known species, all native to central Africa, including the island of São Tomé in the Gulf of Guinea.Kew World Checklist of Selected Plant FamiliesMargonska, H.B. & Szlachetko, D.L. (2005). Taxonomic revision of the African genus Orestias Ridl. (Malaxidinae, Orchidaceae). Annalen des Naturhistorischen Museums in Wien, Serie B 107: 209-220.Pridgeon, A.M., Cribb, P.J., Chase, M.C. & Rasmussen, F.N. (2006). Epidendroideae (Part One). Genera Orchidacearum 4: 1-672. Oxford University Press, New York, Oxford.
Orestias elegans Ridl. - São Tomé, Príncipe Orestias foliosa Summerh. in G.M.D.Troupin - Gabon, Zaire Orestias micrantha Summerh. - São Tomé, Cameroon, Equatorial Guinea Orestias stelidostachya (Rchb.f.) Summerh. - São Tomé
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