Croton pottsii var. thermophilus
SouthW. Naturalist 5: 171. 1960.
Stems somewhat zigzag; erect radii of stellate hairs longer than lateral radii, thus pubescence appearing ± shaggy. Leaf blades usually 1–1.4 cm. Racemes mostly 0.5–0.9 cm. Styles usually 0.5–1 mm. Capsules 4 mm.
Phenology: Flowering Jul–Oct.
Habitat: Basalt and limestone hills.
Elevation: 700–1800 m.
Tex., Mexico (Coahuila).
Variety thermophilus is restricted to Brewster County and nearby Mexico.