Notes on neotropical Amanoa (Euphorbiaceae)

Lectotypes are designated forAmanoa caribaea Krug & Urban andA. guianensis Aublet; presumed syntypes of the latter taxon are shown to be heterogeneous by inclusion of a previously unrecognized species. Four new species ofAmanoa are described:A. congesta from French Guiana and northeastern Brazil;A. gracillima from Manaus, Brazil;A. nanayensis from Amazonian Peru and adjacent Colombia and Brazil; andA neglecta from French Guiana and Surinam.Amanoa sinuosa is proposed as a new name for the later homonymA. robusta Leal. A key to the 13 neotropical species is presented.