Harrisia taetra Areces 1980

Plants shrubby, 1-2.5 m (3.3-8.2 ft) high. Stem segments cylindrical, 30-100 cm (12-39 in) long, 6.5-8 cm (2.6-3.1 in) in diameter. Ribs 8-10. Spines rigid, needle-like, straight, nearly black when young, later whitish yellow. Central spines 2-3,4-9 cm (1.6-3.5 in) long. Radial spines 6-9,0.7-4.4 cm (0.3-1.7 in) long. Flowers 16.5-20 cm (6.5-7.9 in) long, 12-15 cm (4.7-5.9 in) in diameter. Fruits 4-8 cm (1.6-3.1 in) long, 5-8 cm (2-3.1 in) in diameter. Distribution: Gua-nahacabibes Peninsula, western Cuba.

Continue reading here: Harrisia taylori Britton 1908

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