Novon 12: 62. 2002.
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.
Phenology: Flowering late spring–early fall.
Habitat: Dry gypseous clays and shales
Elevation: 600-1000 m
Tex., Mexico (ne Chihuahua)
"thick" is not a number.