Dichanthelium (Poaceae) in the United States and Canada

Abstract

This is a taxonomic revision of the grass genus Meis tg as represented in the United States and Cana Keys and descriptions are provided e 45 taxa (26 species and 19 varieties) of the United States and Canada recognized by SC writers.A total of 26 new combinations and changes of status are proposed.Many species of the genus Dichanthelium (Panicum subgenus Dichanthelium Hitchc.& ed are widespread through the eastern half of the United States and the center of dive appears to be in southeastern North America.At least some species are present E. Piece the cool, subtropical and tropical regions of North Lee and the Caribbean, and a few species range throughout much of South America.The genus also is represented in the Hawaiian Islands.This publication represents the first major revision ei Bi Dichanthelium grass group since the monograph of Panicum by Hitchcock and Chase in Linnaeus ( 1753), in Species Plantarum, described the first three species that are included in the Dichanthelium group, Panicum dichotomum, P. clandestinum, and P. latifolium.Panicum dichotomum L. was designated as the type species of Panicum subgenus Dichanthelium by Hitchcock & Chase (1910) and is herein accepted as the type of the genus Dichanthelium.Lamarck in 1798 described Panicum scoparium, P. laxiflorum, P. nitidum, and P. nodiflorum; the last two species are now submerged in synonymy under Dichanthelium dichotomum.