Haworthiopsis viscosa

Haworthiopsis viscosa, formerly Haworthia viscosa, is a species of flowering succulent plant from the Western and Eastern Cape Provinces, South Africa.
Description.
"Haworthiopsis viscosa" typically grows its sharp succulent leaves in three tiers or columns ("trifarious" leaf arrangement). The pointed leaves are scabrous ("viscosa" means "sticky") and packed densely along its stems.
The plant offsets from its base and can eventually form large clumps. In the wild, it often shows damage from grazing animals, as it is a common food source.
The flowers appear from October to November.
Varieties.
This is a relatively variable species, and several regional varieties are recognised. "H. beanii" and "H. tauteae" are possible variants. 
"H. viscosa var. variabilis" is a variety with variable leaf-length, from the far south of the species' natural range, north-east of Joubertina.
Taxonomy.
The species was previously included in "Haworthia" subgenus "Hexangulares". Phylogenetic studies demonstrated that subgenus "Hexangulares" was actually relatively unrelated to other haworthias and so it was moved to the new genus "Haworthiopsis".
This species readily hybridises with other species of "Haworthiopsis", as well as with species of "Astroloba" and other related genera.
Distribution.
This species extends across the southern part of the former Cape Province of South Africa. Its range stretches on both sides of the border between the Western Cape and Eastern Cape Provinces, encompassing the Little Karoo and the southern verges of the Great Karoo. It is also found in the Gamtoos Valley.
Within this range, it typically grows in very well-drained sandy soil, either in full sun, or under a bush or rocky crevice which serves as partial protection from the sun.