Gymnocalycium mesopotamicum R Kiesling 1980
Plants solitary, depressed globose, dark green, 1.2-2.3 cm (0.5-0.9 in) high, to 4 cm (1.6 in) in diameter. Ribs 7-9, broad, low, obtuse, tubercles not prominent, with transverse grooves. Spines 9-12, flexible, flattened against the stem surface, hairlike, reddish brown, becoming grayish white with age, 2-9 mm (to 0.4 in) long. Flowers pure white, 6-7 cm (2.4-2.8 in) long, to 6.5 cm (2.6 in) in diameter. Fruits club shaped, dull green, 2-3 cm (0.8-1.2 in) long, 0.7-0.8 cm (0.3 in) in diameter. Distribution: Corrientes, Argentina.
Continue reading here: Gymnocalycium mihanovichii Fric ex Giirke Britton
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