Echinocereus viridiflorus var. davisii (Houghton) W.T.Marshall

Body solitary, globular to 5 cm wide with 7-9 ribs. Areoles with 9-12 reddish or greyish radial spines to 1.7 cm long. Flowers greenish yellow to 2 cm wide.

C & S North America

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.

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