Crotoneae, Dumortier, 1829

Sodré, Rodolfo C., Berry, Paul E. & Da Silva, Marcos J., 2017, The tribe Crotoneae (Euphorbiaceae, Crotonoideae) in the Chapada dos Veadeiros, Goiás, Brazil, Phytotaxa 321 (1), pp. 1-59 : 3

Key to the genera of Crotoneae occurring in the Chapada dos Veadeiros

1. Leaves lobed or unlobed; staminate cymules with flowers appearing alternately along the inflorescence main axis from shortened secondary axes (up to 1 mm long); staminate receptacle glabrous; seeds quadrangular .................................................... 1. Astraea

- Leaves always unlobed; staminate cymules with flowers emerging from the same point, not on an evident secondary axis; staminate receptacle villous; seeds ovoid, oblongoid, or ellipsoid, laterally compressed ............................................................ 2. Croton