Acanthocalycium thionanthum
(Spegazzini) Backeberg 1935
- – Echinopsis thionantha – (Spegazzini) Werdermann 1931
– Echinocactus thionanthus – Spegazzini 1905,
– Lobivia thionantha – (Spegazzini) Britton & Rose 1922,
– Echinocactus chionanthus – Spegazzini 1905,
– Lobivia chionantha – (Spegazzini) Britton & Rose 1922,
– Echinopsis chionantha – (Spegazzini) Werdermann 1931,
– Acanthocalycium chionanthum – (Spegazzini) Backeberg 1935
– Acanthocalycium griseum – Backeberg 1963, not validly published
– Acanthocalycium brevispinum – F. Ritter 1964,
– Echinopsis brevispin (F. Ritter) – H. Friedrich & G. D. Rowley 1974
– Acanthocalycium catamarcense = F. Ritter 1980
Plants usually solitary, globose to short cylindrical, dark green to gray-green, to 12 cm (4.7 in) high and 10 cm (3.9 in) in diameter. Ribs 9-15, round, slightly notched and tuberculate. Areoles elliptical. Spines awl shaped, gray with dark tips, 1-1.5 cm (0.4-0.6 in) long. Central spines 1—4, sometimes absent. Radial spines 5-10. Flowers somewhat bell shaped, bright yellow to red to white, to 4.5 cm (1.8 in) long and in diameter; pericarpels and floral tubes with dark, spine-tipped scales and brown to white hairs and bristles. Fruits globose, dehiscent, hard, to 1 cm (0.4 in) in diameter.
Distribution: Salta, Argentina.
References: Anderson E.F. - The Cactus Family