Chapter 11 No.11

THE GENUS PILOCEREUS.

(From pilos, wool, and Cereus, in allusion to the long hairs on the spine cushions, and the affinity of the genus.)

NE of the most striking plants in this order is the "Old Man Cactus," botanically known as Pilocereus senilis, which is the only member of this genus that has become at all known in English gardens. In Cont