Chamaesyce geyeri (Engelmann & A. Gray) Small var. wheeleriana (Warnock & M. C. Johnston) Mayfield

Involucral gland appendages absent or rudimentary. Staminate flowers 10–20. Capsules 1.5–2 × 2–3 mm. Seeds 1.6–1.7 × 0.9–1.2 mm. 2n = 12.

Flowering and fruiting midsummer–early fall. Sand barrens, riverbanks, disturbed sandy or gravelly areas; of conservation concern; 500–1500 m; N.Mex., Tex.; Mexico (Chihuahua).

Variety wheeleriana is known in the flora area from south-central New Mexico and western trans-Pecos Texas.