Body spherical to shortly cylindrical eventually large to 1 m tall. Ribs 16-20, tuberculate with large areoles. Central spines 4-8, radials 16-24. Flowers pink, 3-6 cm long.

Chile

 

N. wagenknechtii F. Ritter differs mostly in having fewer ribs and flowers less than 3 cm long.

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.