From Mez 1935
var. atropurpureus Mez var. nov.
C. atropurpureus Hort. Edinb. ined.
A typo evidenter differt omnibus partibus satis minoribus. Folia constanter rubra sub
sole purpurascentia minus insigniter bivittata, vix ultra 50 mm longa et 15 mm lata.
Nur kultiviert bekannt.
Translated by Butcher
Evidently different to type with all parts sufficiently smaller. Leaves uniformly red or solely purplish with less remarkable double stripes, barely more than 50mm long and 15mm wide. —SeeSmith & Downs 1979