Leptonema is a genus of flowering plant belonging to the family Phyllanthaceae first described in 1824.Jussieu, Adrien Henri Laurent de. 1824. De Euphorbiacearum Generibus Medicisque earumdem viribus tentamen, tabulis aeneis 18 illustratum 19Tropicos, Leptonema A. Juss. The entire genus is endemic to Madagascar.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, with male and female flowers on separate plants.
Species Leptonema glabrum (Leandri) Leandri Leptonema venosum (Poir.) A.Juss.
formerly included moved to Flueggea Leptonema melanthesoides F.Muell. - Flueggea virosa subsp. melanthesoides (F.Muell.) G.L.Webster
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