Haworthiopsis scabra

Haworthiopsis scabra, formerly Haworthia scabra, is a species of flowering succulent plant from arid regions of the Western and Eastern Cape Provinces, South Africa.
Description.
 
"Haworthiopsis scabra" is a very variable species, with several very distinct varieties. Its name "scabra" means "rough", but only its type-variety truly has rough leaves. It typically grows its leaves in three tiers (trifarious) though some varieties have five-tier leaf arrangement. Many varieties have a spiral twist to their leaves.
Varieties.
The flowers typically appear in November and December.
Taxonomy.
The species was previously including 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".
Distribution.
This species extends across the southern part of South Africa in the arid Little Karoo region. Here it grows on both sides of the border between the Western and Eastern Cape Provinces, from Ladismith in the West to Baviaanskloof in the East.
Within this range, it typically grows in very well-drained sandy soil, usually under a bush or rocks which serve as partial protection from the sun.
Cultivation.
It is very slow growing and is not common in cultivation. It requires extremely well-drained soil and minimal water. They thrive in shady conditions, though some varieties such as "starkiana" can be adjusted gradually to full sun.