Psorothamnus fremontii (Torr. ex A. Gray) Barneby | | a | | Psorothamnus fremontii(Torr. ex A. Gray) Barneby | |
Psorothamnus arborescens (Torr. ex A. Gray) Barneby var. arborescens | | a | i | Psorothamnus arborescens(Torr. ex A. Gray) Barneby var.arborescens | |
Psorothamnus emoryi (A. Gray) Rydb. | | a | | Psorothamnus emoryi(A. Gray) Rydb. | |
Psorothamnus spinosus (A. Gray) Barneby | | a | | Psorothamnus spinosus(A. Gray) Barneby | |
Psorothamnus arborescens (Torr. ex A. Gray) Barneby var. minutifolius (Parish) Barneby | | a | i | Psorothamnus arborescens(Torr. ex A. Gray) Barneby var.minutifolius (Parish) Barneby | |
Psorothamnus schottii (Torr.) Barneby | | a | | Psorothamnus schottii(Torr.) Barneby | |
Psorothamnus scoparius (A. Gray) Rydb. | | a | | Psorothamnus scoparius(A. Gray) Rydb. | |
Psorothamnus fremontii (Torr. ex A. Gray) Barneby var. fremontii | | a | i | Psorothamnus fremontii(Torr. ex A. Gray) Barneby var.fremontii | |
Psorothamnus fremontii (Torr. ex A. Gray) Barneby var. attenuatus Barneby | | a | i | Psorothamnus fremontii(Torr. ex A. Gray) Barneby var.attenuatus Barneby | |
Psorothamnus arborescens (Torr. ex A. Gray) Barneby | | a | | Psorothamnus arborescens(Torr. ex A. Gray) Barneby | |
Psorothamnus arborescens (Torr. ex A. Gray) Barneby var. pubescens (Parish) Barneby | | a | i | Psorothamnus arborescens(Torr. ex A. Gray) Barneby var.pubescens (Parish) Barneby | |
Psorothamnus polydenius (Torr.) Rydb. | | a | | Psorothamnus polydenius(Torr.) Rydb. | |
Psorothamnus arborescens (Torr. ex A. Gray) Barneby var. simplicifolius (Parish) Barneby | | a | i | Psorothamnus arborescens(Torr. ex A. Gray) Barneby var.simplicifolius (Parish) Barneby | |
Psorothamnus kingii (S. Watson) Barneby | | a | | Psorothamnus kingii(S. Watson) Barneby | |