Haematostemon is a genus of plant of the family Euphorbiaceae first described as a genus in 1919.Pax, Ferdinand Albin & Hoffmann, Käthe. 1919. Das Pflanzenreich IV. 147 IX–XI(Heft 68): 31Tropicos, genus Haematostemon It is native to northeastern South America (Guyana and southern Venezuela).Kew World Checklist of Selected Plant FamiliesGovaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1-4: 1-1622. The Board of Trustees of the Royal Botanic Gardens, Kew.Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
Species Haematostemon coriaceus (Baill.) Pax & K.Hoffm. - Amazonas State in S Venezuela Haematostemon guianensis Sandwith - Potaro-Siparuni region of Guyana
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