Hymenostephium
Hymenostephium is a genus of flowering plants in the family Asteraceae. It includes herbs and slender shrubs that occur from Mexico through to Venezuela and north-western Argentina.
Description
Hymenostephium is characterized by the relatively slender habit of the plants, 1–2 seriate involucres, and relatively small heads of flowers. There is variation in the pappus which, in part, has led to some members having been placed formerly in the now empty genus Haplocalymma, or in separate genera now considered as synonymous with Hymenostephium.
Molecular phylogenetic data place the genus as sister to Sclerocarpus and in a relatively basal position in the subtribe Helianthinae, the group that includes the common sunflower.
Species
Includes 22 accepted species;Hymenostephium anomalum E.E.Schill. & Panero - ColombiaHymenostephium brandegeei E.E.Schill. & Panero - Mexico Hymenostephium cordatum S.F.Blake - Mexico to northern ColombiaHymenostephium debile Cabrera - Argentina, Bolivia Hymenostephium gracillimum E.E.Schill. & Panero - Mexico Hymenostephium hintonii E.E.Schill. & Panero - Mexico Hymenostephium kingii E.E.Schill. & Panero - Mexico Hymenostephium lepidostephanum E.E.Schill. & Panero - PeruHymenostephium meridense S.F.Blake - VenezuelaHymenostephium molinae E.E.Schill. & Panero - NicaraguaHymenostephium mucronatum E.E.Schill. & Panero - Colombia, VenezuelaHymenostephium quitensis E.E.Schill. & Panero - Colombia to Venezuela and EcuadorHymenostephium rivularis E.E.Schill. & Panero - Central America to western BoliviaHymenostephium rudbeckioides S.F.Blake - Ecuador to PeruHymenostephium serratum E.E.Schill. & Panero - Colombia, VenezuelaHymenostephium strigosum E.E.Schill. & Panero - Costa RicaHymenostephium superaxillare S.F.Blake - Mexico Hymenostephium tenue E.E.Schill. & Panero - Mexico Hymenostephium uniseriatum E.E.Schill. & Panero - Mexico Hymenostephium viride Steyerm. - VenezuelaHymenostephium websteri E.E.Schill. & Panero - Mexico Hymenostephium woronowii E.E.Schill. & Panero - Mexico
Distribution
They are native to the countries of north western Argentina, Bolivia, Colombia, Costa Rica, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panamá, Peru and Venezuela.