Bot. Misc. 3: 143. 1833.
Shrubs or multi-trunked trees, 1–8 m. Stems branched at right angles, ± terete; branchlets with lepidote scales. Leaves: petiole 1–1.2 mm; blade 1–3(–5) × 0.2–0.6 cm, base rounded, apex shallowly emarginate to rounded, abaxial surface densely lepidote, adaxial surface smooth. Inflorescences terminating spur shoots, 1–3 cm, lepidote. Pedicels 3–4 mm. Flowers: sepals (reflexed at anthesis), ovate, proximal pair 0.8–1.5 mm, distal pair 3–3.5 × 2.5 mm, abaxially lepidote, adaxially tomentose, hairs simple; petals white, oblong, 3–6.5 × 2–3 mm; staminodia 0–3; gynophore 3–8 mm. Capsules 8–11 × 5–6 mm, dehiscing into 2–4 segments, constricted between seeds, mesocarp red. Seeds 3.8–5 mm. 2n = 16.
Phenology: Flowering early summer.
Habitat: Desert scrub, arroyos or flats
Elevation: 50-200 m
Ariz., Mexico (Baja California, Baja California Sur, Sinaloa, Sonora), South America (Argentina, Bolivia, Chile).