Echinocereus knippelianus Liebner

Body clustering, globular to 5 cm wide with 6 or 7 rounded ribs. Areoles with 3-4 yellowish spines to 1 cm falling at maturity. Flowers whitish, outer petals pinkish 4 cm long.

NE Mexico

Source: Forbes, S. (1997). Echinocereus. 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. (as Echinocereus knippelianus var. kruegeri)

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kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Caryophyllanae
order      Caryophyllales
family       Cactaceae
genus        Echinocereus Engelm.