Gymnocalycium amerhauseri H Till 1994

Plants usually solitary, flattened globose to globose, dark green to bluish gray-green, glossy, plump, to 2.5 cm (1 in) high, 5-6 cm (2-2.4 in) in diameter. Ribs usually 8, rounded. Areoles oval, with yellowish white wool, later naked. Central spine one, present only on mature areoles, 12-14 mm (0.50.6 in) long. Radial spines 5-7, radiating, slightly curved to straight, white with dark brown bases, 6-12 mm (0.2-0.5 in) long. Flowers funnelform, widely open, creamy white to pale pink, to 3 cm (1.2 in) in diameter. Fruits oval to spindle-like, dark green, 32-33 mm (1.3 in) long, to 19 mm (0.7 in) in diameter. Seeds globose. Distribution: Córdoba, Argentina.

Gymnocalycium andreae (Boedeker) Backeberg 1935 Echinocactusandreae Boedeker 1930

Gymnocalycium andreae subsp. carolitiettse G. J. A. Neuhuber 1994

Plants often forming clusters to 15 cm (5.9 in) or more wide. Stems globose, blue-green to blue-gray, to 5 cm (2 in) high and in diameter. Ribs about 8, flat, poorly defined, rounded, with sharp cross-furrows, chinlike protrusions absent. Central spines 1-3, slightly curved upward, dark brown. Radial spines about 7, thin, spreading, whitish with darker bases, to 8 mm (0.3 in) long. Flowers clear sulfur yellow, to 3 cm (1.2 in) long, 4-5 cm (1.6-2 in) in diameter. Fruits globose to cylindrical, blue-green, to 1.2 cm (0.5 in) in diameter. Distribution: Córdoba and San Luis, Argentina.

Two subspecies of Gymnocalycium andreae are recognized. Subspecies andreae occurs in the Sierra de Córdoba. Subspecies carolinense occurs in the Sierra de San Luis.

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