Body more or less spherical. Ribs 5-8. Central spines 0, radial spines 5-8, slightly wavy, pressed to the stem, yellow to white. Fruit green, scaly.

S Brazil

 

Other species with white flowers (occasionally tinged pink) include G. anisitsii (K. Schum.) Britton & Rose from Paraguay [G. damsii (K. Schum.) Britton & Rose], G. platense (Speg.) Britton & Rose from Argentina, G. gibbosum (Haw.) Pfeiff. from Argentina, G. schickendantzii (A. Weber) Britton & Rose from N Argentina, and G. marsoneri (Fric) Ito from Paraguay.

Source: Thompson, A, ; Forbes, S.; Spencer, R. (1997). Cactaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.