This member of the Cactaceae family was given this name by Franz Buxbaum in 1975. It is found in Mexico, growing in grit with little water and lots of sun. The caudex can grow to ten centimetres or more, the long slim branches to two meters. The flowers are pink to dark red, and the plant can be reproduced both by seeds and cuttings.
The genera name from pene; 'thread' and Cereus another member of the Cactaceae family, as to plant's form. The species name means 'vipers'.

