Frost Tolerance: 15° F (-10° C)
Origin: Argentina (Catamarca)
Growth Habits: Usually solitary, up to 6 inches tall (15 cm), 3 inches in diameter (8 cm); 8-14 ribs; dark spines, 0 or occasionally 1 or2 central spines, 5 to 10 radials to 1 inch long (2.5 cm).
The plant described as Acanthocalycium aurantiacum, now included in this taxon has red flowers with orange centers, grows to 2 inches tall (5 cm), 3.5 inches in diameter (9 cm), has 5 to 7 radials.
Blooming Habits:
Yellow or red and yellow flowers in summer, up to 2.4 inches long and in diameter (6 cm), followed by dark green, globose fruits, 0.8 inches in diameter (2 cm).
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