Gymnocalycium horstii Buining 1970

Plants solitary at first, forming clusters later. Stems globose, bright green, to 20 cm (7.9 in) high and in diameter. Ribs 5-6, wide, rounded, somewhat acute, deeply furrowed.

Gymnocalycium With Short Spines
Gymnocalycium gibbosum, photograph by Jean-Marie Solichon

Gymnocalycium horstii

Plants usually solitary, globose to short cylindrical, dark blue-green, 12-15 cm (4.7-5.9 in) high, 10-12 cm (3.9-4.7

Gymnocalycium Eurypleurum
Gymnocalycium eurypleurum

Spines usually 5, yellowish white, one pointing downward, others to the sides, straight to slightly curved, to 3 cm (1.2 in) long. Flowers creamy white to pale purplish pink, to 11 cm (4.3 in) long and in diameter. Fruits ovoid, blue-green. Distribution: Rio Grande do Sul, Brazil.

Gymnocalycium hossei (F. Haage) A. w. Hill 1933 Echinocactus hossei F. Haage 1927

Echinocactus mazanensis Backeberg 1932, Gymnocalycium maza-

nense (Backeberg) Backeberg 1935 Echinocactus rhodantherus Boedeker 1934; Gymnocalycium rhodan-

therum (Boedeker) Backeberg 1936, not validly published Gymnocalycium nidulans Fric ex Backeberg 1936 Gymnocalycium weissianum Backeberg 1936 Gymnocalycium guanchinense Sch├╝tz 1947

Plants usually solitary, flattened globose to globose, gray-green to brownish green, to 9 cm (3.5 in) high and 14 cm (5.5 in) in diameter. Ribs 13-19, fairly broad. Central spine one, brown, becoming gray with age. Radial spines 7-9, spreading, curving backward, one pointing downward, others to the sides, brown, becoming gray with dark tips, to 1.5 cm (0.6 in) long. Flowers whitish to reddish pink, sometimes with brownish tint, with short floral tubes. Distribution: La Rioja and Catamarca, Argentina.

Gymnocalycium hybopleurum (K. Schumann) Backeberg 1936

Echinocactus multiflorus var. hybopleurus K. Schumann 1898 Gymnocalycium nigriareolatum Backeberg 1934 Gymnocalycium nigriareolatum var. densispinum Backeberg ex H. Till 1998

Gymnocalycium nigriareolatum var. slmoi H. Till 1998

Plants solitary, occasionally clustering, broadly globose, blue-green, to 15 cm (5.9 in) high and in diameter. Ribs 10, sharply angled, with small chinlike protrusions. Central spine one, with dark tip. Radial spines 7-8, pinkish gray, straight to slightly curved, to 3 cm (1.2 in) long. Flowers ivory white. Fruits bluish. Distribution: Catamarca, Argentina.

Gymnocalycium hyptiacanthum (Lemaire) Britton & Rose 1922

Echinocactus hyptiacanthus Lemaire 1839, Cactus hyptiacanthus (Lemaire) Steudel 1840

Plants solitary, flattened globose to globose, dull gray-green, to 10 cm (3.9 in) or more in diameter. Ribs 9-11 with conical tubercles. Central spine one, white to gray. Radial spines 5-11, stiff, straight, to 1 cm (0.4 in) long. Flowers dull white or pale yellowish white, to 5 cm (2 in) long. Distribution: Uruguay.

Continue reading here: Gymnocalycium kieslingii 0 Ferrari 1985

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