Contr. U. S. Natl. Herb. 12: 431. 1909.
Plants terrestrial to epiphytic, vinelike, clambering, pendent. Roots frequently aerial and adventitious. Stems bluish green to purple, to 100–300 × 2.5–5 cm; ribs 4–6, acute; areoles 2–2.5 cm apart along ribs, 1.5–3.0 mm. Spines 1–5, short conic (acicular on immature stems), 1–3 mm; radial and central spines not distinguishable. Flowers 25–30 × 20 cm; outer tepals brown or purplish (or yellow?), narrow; inner tepals white, oblanceolate, apex acute; areoles of ovary and flower tube bearing numerous scales and long, white, hairlike spines. Fruits red, spheric, 45–70 mm diam., hidden by short (to 1 cm), yellowish, bristlelike spines and long, white hairlike spines. 2n = 22.
Phenology: Flowering year-round.
Habitat: Disturbed coastal sites
Elevation: 0-10 m
Introduced; Fla., Mexico.
Selenicereus pteranthus is widely cultivated for its showy, fragrant flowers and occasionally escapes. The species is reported from six counties in Florida, where it is presumed naturalized.