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.
Oxalis pilosa
This species is extensively branched above ground with small leaves and flowers. Variety pilosa differs by its uneven calyx pubescence and acute calyx lobes.