Form huge balls with large tubercles and long, arching spines.
The flowers are white or clear pink whit a darker pink throat.
 

Scientific name:  Gymnocalycium ssp. tilcarense (Backeb.) H.Till & W.Till

Origin:  Northern Argentina (Dept. Tilcara, Quebrada de Humahuaca, 7500 feet - 2250 m)

Conservation status: Listed in CITES appendix 2.

Common Name: Giant Chin Cactus

Etymology: Named after habitat, Argentina, Prov. Jujuy, Tilcara.

• Echinocactus saglionis Cels 1847
• Brachycalycium tilcarense Backeberg of 1942
• Gymnocalycium tilcarense
• Gymnocalycium saglionis subsp. tilcarense (Backeberg) H Till and W Till 1997
• Gymnocalycium saglionis var. tilcarense (Backeb.) Krainz.

Cultivation: Keep this plant almost dry in winter at a minimum temperature of 0°C (but hardy down to -20° C) prefer a low pH  compost otherwise growth will stop altogether. The plant tolerate extremely bright situations  but are likely to suffer from sun scorch or stunted growth if over exposed to direct sunlight during the hottest part of the day in summer.  Since they are big sized plants need plenty of space for their roots, repotting should be done every other year or when the plant has outgrown its pot.
This species makes a great landscape cactus in moderate climates.

Propagation: Seeds (It don't produces offsets)

Seed Collecting: Permit fruit to ripen, fruit must be significantly overripe before harvesting seed; clean and dry seeds
 

Photo of conspecific taxa, varieties, forms and cultivars of Gymnocalycium saglionis:

• Gymnocalycium saglionis
• Gymnocalycium saglionis forma cristata
• Gymnocalycium tilcarense (G. saglionis ssp. tilcarense)