S2?
Imperiled in NM because of rarity or because of some factor(s) making it very vulnerable to extirpation from New Mexico. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000).
The numeric rank is inexact.
Draba heilii (Heil's Alpine Whitlowgrass)
Densely caespitose perennial; caudex few-branched, compact, with persistent, thickened leaves; basal leaves imbricate, undifferentiated into blade and petiole, linear-lanceolate, 5-8 mm long, 1-1.5 mm wide, surfaces glabrous or rarely pilose, margins...