2 literature references for Psorothamnus fremontii (A.Gray)Barneby:

Author: Barneby,R.C.
Year: 1977
Title:
Source: Mem. New York Bot. Gard. 27:1-891 Daleae Imagines
Author: Barneby,R.C.
Year: 1989
Title:
Source: Fabales.In:A.Cronquist et al.Intermountain Fl.3B:1-20,27-279