ruthbancroftgarden:

Haworthiopsis coarctata var. tenuis

This plant was formerly in the genus Haworthia, but the group it belongs to (which was called subgenus Hexangulares) has been elevated to the level of a genus. The plants in this group generally have firmer leaves than most haworthias, and this includes the ones which stack up to form columns – like H. coarctata. Haworthiopsis coarctata var. tenuis is more slender than other forms of the species, and it tends to color up nicely, taking on purplish-red tones. At one time, this plant was considered to be a form of H. reinwardtii, which is closely related to H. coarctata, but authority Bruce Bayer says it belongs in H. coarctata. It comes from near Grahamstown in South Africa’s Eastern Cape Province.

-Brian