Copio textualmente lo que dice en The Cactus Family, de Anderson, en la descripción que da para G. saglionis.
Gymnocalycium saglionis (Gels) Britton & Rose 1922
GIANT CHIN CACTUS
Echinocactus saglionis Cels 1847
Brachycalycium tilcarense Backeberg 1942, Gymnocalycium saglionis
subsp. tilcarense (Backeberg) H. Till & W. Till 1997
?Echinocactus hybogonus Salm-Dyck 1950
Plants solitary, large, flattened globose, dull green to bluegreen,
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 tilarense differs from subspecies saglionis
in having flowers with shorter floral tubes and occurring
only in an area near Tilcara.
Y de Pilbeam de gymnos, para la flor, siempre de G. saglionis:
Flowers are white or white tinged with pink, with red throat, 3,5 cm long, 2 to 3 cm wide, short tubed, urne shaped.
