Studies in the genus Physaria (Cruciferae)

Building upon a taxonomic treatment ofPhysaria published in 1939, an extension of information concerning the genus is presented. Comments on misapplication of the nameP. acutifolia Rydb., a new trichome type forPhysaria, and a high elevation species in Colorado are accompanied by the presentation of four new taxa. These areP. alpina, P. eburniflora, P. lepidota, andP. newberryi var.racemosa.