Panicum columbianum var. siccanum (Hitchcock & Chase) B. Boivin

Panicum columbianum var. siccanum (Hitchcock & Chase) B. Boivin is a synonym sensu Thomas, 2015 of:

Dichanthelium portoricense (Desvaux ex Hamilton) B.F. Hansen & Wunderlin, an accepted species name sensu Soreng et al., 2000+.