Circular No. 66. U. S. Dept. of Agriculture 



Plate 13 



u 



A. — Lemaireocereus griseus (Cereus eburneus). Missouri Botanical Garden, 1905. B. — Cephalocereus 

 (Pilocereus) polylophus. Missouri Botanical Garden, 1905. C. — Harrisia (Cereus) tortuosa. Mis- 

 souri Botanical Garden, 1908 



