Description: Geohintonia is a monospecific genus discovered in 1992. It is a strongly ribbed cactus of unique appearance.
Stems: Usually solitary, dark green/brown covered by a glaucous/grey pruina, globose becoming slowly columnar, up to 10 cm or more, 10 cm in diameter with a woolly apex.
Ribs: Numerous (18-20) and well distinct.
Areoles: Large, discrete, at first with long wool, later nearly naked.
Spines: Few, very short (3 to 15 mm), triangular, curved, flatened and corky, soon papery a brittle deciduous. Easily detached from the base.
Stems: Usually solitary, dark green/brown covered by a glaucous/grey pruina, globose becoming slowly columnar, up to 10 cm or more, 10 cm in diameter with a woolly apex.
Ribs: Numerous (18-20) and well distinct.
Areoles: Large, discrete, at first with long wool, later nearly naked.
Spines: Few, very short (3 to 15 mm), triangular, curved, flatened and corky, soon papery a brittle deciduous. Easily detached from the base.