Plants with woody caudex; moderately to densely pubescent or glabrate. Stems 1–6 dm, woody proximally, pubescent or glabrate with age. Cauline leaves: petiole 0.3–1.5 cm, often not sharply differentiated from blade, or (distal) sessile; blade usually obovate to spatulate or oblanceolate, rarely elliptic, 1–4(–4.5) cm × (4–)7–20(–30) mm (not fleshy), base attenuate, margins dentate, repand, or entire, apex acute to obtuse. Racemes 3.5 dm. Fruiting pedicels (rarely recurved), (7–)10–20 mm, densely pubescent. Flowers: sepals (spreading) oblong to oblong-lanceolate, 5–9 × 1–2 mm; petals obovate, (8–)10–14(–15) × 5–9 mm, claw (often flattened, margin dentate) to 2 mm; filaments 4.5–7.5 mm; anthers 2–3.5 mm. Fruits angustiseptate, 1.5–3(–4) cm × 1.5–3(–4) mm; ovules 40–100 per ovary; style (1.5–)2–3.8(–4.3) mm. Seeds 0.8–1.1 × 0.5–0.7 mm. 2n = 18, 19, 21, 22, 27, 32, 34, 36, 40, 41, 58.

Phenology: Flowering year-round, mostly Feb–Sep.
Habitat: Clay flats, gypseous clay, gravelly knolls, hillsides, sandy washes
Elevation: 200-1300 m

Distribution

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N.Mex., Tex., Mexico (Chihuahua, Coahuila, Durango, Nuevo León, Tamaulipas, Zacatecas).

Discussion

Selected References

None.

Lower Taxa

None.