Selinocarpus diffusus A. Gray var. parvifolius Torrey in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 168. 1859; S. parvifolius (Torrey) Standley

Plants herbaceous or ± woody at base, overall moderately pubescent with glandular hairs and minute, appressed, white, flattened hairs with conic bases . Stems erect or ascending, sparsely leafy, 15-60 cm. Leaves yellow-green, drying dull brownish green, petiolate, those of a pair slightly unequal, abruptly reduced toward inflorescence, somewhat succulent; petiole 1-8 mm; blade ovate or ± diamond-shaped, 9-22 × 4-12 mm, base obtuse or ± cordate, margins entire or undulate, apex acute. Flowers usually 1 in axils of bracts in repeatedly forked inflorescences; pedicel 1-3 mm; perianth 34-52 mm, tube yellowish green, limbs pale yellowish green, 10-15 mm diam.; stamens 5. Fruits 8-10 mm, puberulent with glandular hairs and white flattened hairs; wings 2-4 mm wide.

Flowering late spring-early fall. Dry gypseous clays and shales; 600-1000 m; Tex.; Mexico (ne Chihuahua).