Hymenostephium
Encyclopedia
Hymenostephium is a genus
of flowering plants in the family Asteraceae
. It includes about 20 species of herbs and slender shrubs that occur from Mexico through Central America and into South America. It 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 the members having been placed formerly in several different genera (Garcilassa, Haplocalymma, and Viguiera sect. Diplostichis). 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 (Helianthus annuus).
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
of flowering plants in the family Asteraceae
Asteraceae
The Asteraceae or Compositae , is an exceedingly large and widespread family of vascular plants. The group has more than 22,750 currently accepted species, spread across 1620 genera and 12 subfamilies...
. It includes about 20 species of herbs and slender shrubs that occur from Mexico through Central America and into South America. It 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 the members having been placed formerly in several different genera (Garcilassa, Haplocalymma, and Viguiera sect. Diplostichis). 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 (Helianthus annuus).