Echinocereus rigidissimus var. rubrispinus
(the varietal epithet meaning red-spined)
rigidissimus (Engelmann) F. Haage
Published in: Special Preisverz. 13. 1897.
Synonyms: Echinocereus pectinatus
Mexico (northern Sonora, north-western Chihuahua
Habitat: The reported habitat preference for limestone is
erroneous; this species is a calcifuge, preferring soils poor in lime
and usually acid.
Conservation status: Listed in
CITES appendix 2.
Common Name: Rainbow cactus, Ruby Rainbow.
NOTE: Echinocereus rigidissimus,
lacking central spines, belongs to the
E. reichenbachii group, unrelated to the superficially
similar E. pectinatus group, which has at least
microscopically visible stubs of central spines. It sometimes occurs
with E. pseudopectinatus but without evidence of
It is a handsome plant flowering or not for its beautiful
new spination which is a lacy raspberry red.