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.
Bidens lemmonii (Lemmon Beggar-Ticks)
Annual composite, rayless, heads subsessile or short-pedunculate; leaves pinnately dissected, the divisions linear, often confused in collections with Heterosperma pinnatum Cav.