Galena Creek rockcress (Arabis rigidissima v. demote) is a slender perennial plant in the Brassicaceae (mustard) family. The species occurs on sandy to rocky soils or on outcrops derived from granitic or volcanic materials, mostly on moderate to steep terrain with northerly aspects. Galena Creek rockcress has a global rank of G3T3Q (vulnerable but has taxonomic questions), a state rank of S1 (critically imperilled), a California Native Plant Society Rare Plant Rank of 1B.2 (rare, threatened or endangered in California and elsewhere; fairly endangered in California), and is on the at-risk list of the Nevada Natural Heritage Program. The species is restricted to Washoe County in Nevada and Placer and Nevada counties in California, and just an estimated 10,000 individuals are known from private, state and USDA Forest Service land. The primary threats to the species are recreational activities that might trample or uproot plants (e.g., camping, hiking, equestrian use, trail construction, snowmobiles) and climate change.  Projects such as fencing and signage near plants are aimed at reducing recreation impacts around known sites. Galena Creek rockcress is monitored by the USDA Forest Service.