Circular No. 66, U. S. Dept. of Agriculti 



Plate 5 



A.— Flower of Echinocereus enneacanthus. Missouri Botanical Garden, 1901. B— Wilcoxia poselgeri 

 {Cere us tuberosus) . Missouri Botanical Garden, 1899. C.—Echinopsis turbinata (gemmata). Mis- 

 souri Botanical Garden, 1908. D.— Zygocactus {Epiphyllum) truncatus 



