Cereus tonduzii F. A. C. Weber 1902, Werckieocereus tonduzii (F. A. C. Weber) Britton & Rose 1909
Plants climbing, sprawling, or pendent, branching apically or laterally. Roots copious, aerial. Stems rounded basally for 1-4 cm (0.4-1.6 in), then three-angled, light green, to 40 cm (16 in) long, 3-5 cm (1.2-2 in) wide, with concave faces, slightly lobed marginally. Areoles small, with whitish or blackish wool. Spines 1-2, sometimes absent, conical to needle-like, brownish, to 2 mm long. Flowers borne singly from subapical areoles, funnelform, white, 7-8 cm (2.8-3.1 in) long, floral tubes nearly straight or upcurved; pericarpels tuberculate, with bracts, dark wool, and radiating spines 1-6 mm (to 0.2 in) long. Fruits subglobose, light green, becoming yellow, heavily spined, to 4 cm (1.6 in) in diameter. Distribution: Costa Rica.
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