There are only three species of Tanquana; the other two being T. hilmarii and T. archeri (which I have never seen). All three used to be called Pleiospilos because of the dotted leaves, but actually the two genera are not closely related.
Over time T. prismatica may form clusters of up to 30 branches. The leaves are unequal, egg-shaped in young plants but more oblong later, with a length of 2.5-4 cm.
The strongly scented flowers are to 4 cm in diameter and appear from February to May.
The plants are not uncommon on stony flats in the Ceres-Laingsburg area, where they receive 100-150 mm rain per year, mainly in winter.
Below are some pictures to give you an idea of the conditions in the plants’ habitat.
