Acanthocalycium Backeberg 1935

Subfamily Cactoideae, tribeTrichocereeae. Plants usually solitary, globose to somewhat elongate, depressed apically, pale to dark green, 10-15 cm (3.9-5.9 in) in diameter. Ribs 16-20, acute, somewhat tuberculate. Areoles 1-2 cm (0.4-0.8 in) apart, usually yellowish brown. Spines 10-20, straight, needle- or awl-like, flexible, yellowish to brown, with dark tips, becoming gray with age. Flowers borne near the stem tips, open during the day, erect, funnelform to bell shaped, pink to white, to 4 cm (1.6 in) long and in diameter; peri-carpels and floral tubes with spine-tipped woolly scales. Fruits globose, dehiscingvertically, hard, to 1 cm (0.4 in) in diameter, with persistent scales. Seeds brown to black, ovoid, papillate, with a small sunken hilum. Distribution: Argentina.

Acanthocalycium ferrarii Rausch 1976 Acanthocalycium variiflorum Backeberg 1966, not validly published

Plants solitary, globose to cylindrical, green, to 12 cm (4.7 in) in diameter. Ribs as many as 18, rounded, swollen at areoles. Areoles oval, whitish. Spines horn colored to brown, usually straight, awl shaped. Central spines 1-4, to 1.5 cm (0.6 in) long. Radial spines 7-9, to 2 cm (0.8 in) long. Flowers yellow to orange-red to carmine, to 5.5 cm (2.2 in) long and 5 cm (2 in) in diameter. Fruits oval, to 10 mm (0.4 in) long and 8 mm (0.3 in) in diameter. Distribution: Tucuman, Argentina.

106 Acanthocalyáum kHmpelianum

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