Peniocereus occidentalis Bravo 1963
Plants shrubby, scrambling, with open branching. Roots fleshy, carrotlike, light yellowish brown, 30-50 cm (12-20 in) long, 10-15 cm (3.9-5.9 in) in diameter. Older stems straight or arching, dark green, 12-50 cm (4.7-20 in) long, 3-3.5 cm (1.2-1.4 in) in diameter. Juvenile stems smooth, to 1 cm (0.4 in) in diameter. Ribs 6-7 on older stems, as many as 10 on young ones, sometimes forming small tubercles. Central spines yellowish white; on young stems one to 4 mm long, on older stems 1-3, with swollen bases, 3-6 mm (to 0.2 in) long. Radial spines yellowish white to brown, on young stems 5,2-3 mm long, on older stems 8-10,2-8 mm (to 0.3 in) long. Flowers funnelform, white, 7-8 cm (2.8-3.1 in) long; pericarpels with pronounced tubercles and areoles with brownish wool and a few spines. Fruits ovate, 3.5 cm (1.4 in) long. Distribution: Oaxaca, Mexico.
Continue reading here: Peniocereus rosei J G Ortega 1926
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