Xerophyte

Description

E. viridiflorus is a compless that comprises a large number of infraspecific taxa, differing in various combinations of flower color, spine color, number and thickness of central spines, and other characters, including floral scent. Wherever such taxa are sympatric they intergrade; all are freely interfertile in the greenhouse. There are numerous varieties and subspecies The following subspecies are currently recognized the nominate form, subsp. chloranthus (Engelm.) N.P.Taylor, subsp. correllii (L.D.Benson) W.Blum & Mich.Lange, subsp. cylindricus (Engelm.) N.P.Taylor, and subsp. davisii (Houghton) N.P.Taylor.