Amethyst (H1) flowers, VI–X; dark green foliage; height 21–25cm; spread 46–60cm.

Listed as early as 1826 by Conrad Loddiges (Hackney, London, England). However the plant currently grown under this name was found by Georg Arends (Wuppertal, Germany) and introduced by him by 1920.

Named from atro- = dark; purpureus = purple. The name is sometimes hyphenated, atro-purpurea (e.g. J. F. Letts, Hardy heaths & the heather garden: 83 (1966, 2nd edition).).