Sisyrinchium montanum subsp. crebrum (Fernald) Böcher
Sisyrinchium montanum subsp. crebrum (Fernald) Böcher is a synonym sensu FNA Ed. Comm., 2002b of:
Sisyrinchium montanum var. crebrum Fernald, an accepted variety name sensu FNA Ed. Comm., 2002b.