Plants solitary, depressed globose to elongate globose, light olive green, becoming deep green with age, to 6.5 cm (2.6 in) in diameter. Ribs 7-8 with distinct, pointed, chinlike protrusions. Spines about 7, pale yellow, flattened against the stem surface or slightly spreading, curving, to 2.5 cm ( 1 in) long. Flowers creamy white with pink tint, to 5 cm (2 in) long. Distribution: Argentina.
Gymnocalycium delaetii (K. Schumann) Hosseus 1926 Echinocactus delaetii K. Schumann 1901
Plants solitary, depressed globose to globose, glossy light green, to 10 cm (3.9 in) high and in diameter. Ribs 5-8, flat, with poorly developed but separate tubercles, with transverse furrows. Areoles few. Spines 6-7, reddish gray to yellowish brown, curving outward, somewhat flattened, 1-1.5 cm (0.4-0.6 in) long. Flowers deep pink, to 5 cm (2 in) long and 7 cm (2.8 in) in diameter. Fruits ovoid, green. Distribution: northern Argentina. Gymnocalycium delaetii appears to be closely related to G. schickendantzii.
Gymnocalycium denudatum (Link & Otto) Pfeiffer ex
Mittler 1844 SPIDER CACTUS
Echinocactus denudatum Link & Otto 1828, Cereus denudatus (Link & Otto) Pfeiffer 1828
Plants solitary, depressed globose to globose, glossy dark green, 2-3 cm (0.8-1.2 in) high, 6-8 cm (2.4-3.1 in) in di ameter. Ribs 5-8, flat, with poorly developed tubercles. Areoles few. Spines 3-5, whitish yellow, flattened against the stem surface, somewhat twisted, 1-1.5 cm (0.4-0.6 in) long. Flowers pure, shiny white, to 5 cm (2 in) long and 7 cm (2.8 in) in diameter. Fruits oblong, green. Distribution: Rio Grande do Sul, Brazil, into northern Uruguay, in Argentina, and possibly into southern Paraguay. Gymnocalycium denudatum is extremely variable.
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