Contr. U.S. Natl. Herb. 12: 431. 1909.
Plants vinelike, clambering. Roots mostly aerial, but also in soil. Stems light green, 200–400 × 1–2 cm; ribs 4–6, acute; areoles 1.5–2.5 cm apart along ribs. Spines 7–8, yellow to blackish, conic, to 1 mm (rarely longer); radial spines 6–7, circular in cross-section, hairlike spines absent; central spines 1. Flowers 12–14 × 7–8.5 cm; outer tepals narrow, oblong; inner tepals white to pink, narrowly oblong; areoles of ovary and flower tube spiny; scales and long hairs absent. Fruits not observed. 2n = 22.
Phenology: Flowering time unavailable.
Habitat: Woodlands, [subtropical forests]
Elevation: 0-20 m
Tex., Mexico (San Luis Potosí), Mexico (Tamaulipas)