Plants usually solitary, flattened globose with slightly depressed stem tips, dark olive green, partly sunken into the ground, 4.2-6.8 cm (1.7-2.7 in) high, 5.5-8 cm (2.2-3.1 in) in diameter. Ribs 7-8, straight, wide, forming distinct protuberances. Areoles oval to round, with yellowish white wool. Spines 5-7, yellow with red or brown bases, thin, spreading, 5-10 mm (0.2-0.4 in) long. Flowers funnelform, white, to 6 cm (2.4 in) long and 5.2 cm (2 in) in diameter. Fruits ellipsoidal, to 25 mm (1 in) long and 11 mm (0.4 in) in diameter. Seeds globose, black. Distribution: Salta, Argentina.
Gymnocalycium saglionis (Cels) Britton & Rose 1922 GIANT CHIN CACTUS
Brachycalycium tiicarense Backeberg 1942, Gymnocalycium saglionis subsp. tiicarense (Backeberg) H. Till & W. Till 1997 ?Echinocactus hybogonus Salm-Dyck 1950
Gymnocalycium spegazzinii 361
Plants solitary, large, flattened globose, dull green to blue-green, to 15 cm (5.9 in) high and 30 cm (12 in) in diameter. Ribs 10-30 or more with prominent rounded tubercles. Spines yellowish brown to reddish to black, becoming gray with age, 3-4 cm (1.2-1.6 in) long. Central spines 1-3, straight. Radial spines 10-15, curved backward onto the plant body. Flowers with short floral tubes, white or pinkish white, with reddish throats, 3.5 cm (1.4 in) long, 2-3 cm (0.8-1.2 in) in diameter. Fruits globose, reddish. Distribution: northern Argentina.
Two subspecies of Gymnocalycium saglionis are recognized. Subspecies tilcarense differs from subspecies saglionis in having flowers with shorter floral tubes and occurring only in an area near Tilcara.
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