Coryphantha macromeris (Engelm.) Lem.

A distinctive species with pale lilac woolly flowers that have perianth segments with fringed edges and a groove that does not extend all the way to the tubercle axis. Central spines 4-6, radial spines 9-15.

SW North America, Mexico

Generally grown as var. runyonii (Britton & Rose) L.D. Benson which is generally smaller than the species and with fewer spines.

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.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Caryophyllanae
order      Caryophyllales
family       Cactaceae
genus        Coryphantha (Engelm.) Lem.