Euphorbia austrotexana var. austrotexana
Stems 10–22 cm. Leaves: blade linear-oblanceolate, apex rounded. Dichasial bracts reniform-ovate to subdeltate-ovate, base truncate. Seeds 1.6–1.7 × 1.1–1.3 mm, surface with regular concave depressions. 2n = 26.
Phenology: Flowering and fruiting spring.
Habitat: Sandy soils.
Elevation: 200–300 m.
Variety austrotexana is restricted to Atascosa, Bexar, and Wilson counties. According to M. H. Mayfield (2013), only five documented localities are known.