Sulcorebutia rauschii 'Purple' (syn. canigueralii)Sulcorebutia rauschii 'Purple' is a cultivated colour form of Sulcorebutia rauschii, a species native to the high altitude regions of Bolivia. This form is characterised by its pronounced purple to violet epidermis, which can intensify under strong light or cooler temperatures. The plant develops small, flattened, spherical stems densely covered in spiralling tubercles, each tipped with short, fine spines. In late spring to summer, it produces