Sulcorebutia arenacea, is a choice solitary, user-friendly cactus, with perfectly neat, symmetrical spination and profuse yellowish-orange (or rarely magenta) flowers. The spines are pectinate and held so tightly that give a sandy effect.
F. viridescens subs. littoralis is a solitary barrel cactus wider than tall. The spines are dense, pink or yellowish, becoming duller by age or turning yellow or horn-colored. The flowers are greenish yellow or golden-yellow with brownish midstripes.
Eriosyce subgibbosa is a very variable species. Two-tone flower with magenta-purple petal tips and greenish-white throat, which give the sensation of being fluorescent. Spines from creamy yellow to dark gray-brown, different from plant to plant.
Mammilloydia candida called 'Snowball' is a choice cactus with a so dense snowy white, spination, that its body appears hidden by spines. Mammilloydia are clearly related to the genus Mammillaria, but it is usually recognized as a segregate genera.
Geophytic cactus with solitary stems rising barely above ground level, dull dark green, in the sun often tinged with purple. Spines variable, tannish-brown, dull grey or black, straight to curved. Flowers creamy-white to pink.
