Grossera is a plant genus of the family Euphorbiaceae first described as a genus in 1903.Pax, Ferdinand Albin. 1903. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 33: 281-282 descriptions in Latin, commentary and range information in GermanTropicos, Grossera Pax It is native to Madagascar and to mainland tropical Africa.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. It is dioecious.
Species Grossera angustifolia Barbera&Riina - Equatorial Guinea Grossera elongata Hutch. - Príncipe Grossera glomeratospicata J.Léonard - East Congo Grossera macrantha Pax - East Congo, West Congo, Cameroon, Central African Rep. Grossera major Pax - Cameroon Grossera multinervis J.Léonard - East Congo, São Tomé Grossera paniculata Pax - West Congo, Cameroon, Gabon Grossera perrieri Leandri - Madagascar Grossera vignei Hoyle - Ivory Coast, Ghana, West Congo
formerly included moved to Cavacoa G. aurea - Cavacoa aurea G. baldwinii - Cavacoa baldwinii G. quintasii - Cavacoa quintasii
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