Dwarf plant forming a dense mat of bright green foliage in summer, turning brown-green in winter; never blooms; height less than 10cm; spread 21–25cm.
Wild-collected; found near a copper mine in Cornwall, England, by J. F. Letts (Foxhollow, Windlesham, Surrey); introduced by J. F.Letts before 1968.
Name is an allusion to the habit.
