Vulnerable in NM either because rare and uncommon, or found only in a restricted range (even if abundant at some locations), or because of other factors making it vulnerable to extirpation. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals.
The numeric rank is inexact.
Stems herbaceous to 60 cm in height; leaves simple, opposite and triangular-ovate, coarsely toothed, cordate or subcordate at the base, usually exceeding 15.0 mm in length and 2.0 mm in width; heads solitary or few on long naked peduncles with about ...
This small annual species is distinguished by the inflorescence being shorter than the leaves.
Small tree or shrub a 3.0 m in height; branches spiny, the spines purplish-brown and averaging 3.0 to 4.0 cm in length; leaves simple, alternate, broadly elliptic to ovate, not strongly rhombic, 3.0 to 5.0 cm in length and coarsely serrate, but not l...