ILLUSTRATIONS. 



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Plate I. Mamillaria cornifera, Missouri Botanical Garden, St. Louis, 1899 12 



II. Fig. 1. — Mamillaria compacta, Missouri Botanical Garden, St. Louis, 

 1911. Fig. 2. — Mamillaria pyrrhocephala, Missouri Botanical 

 ;. Garden, St. Louis, 1910 12 



III. Echinopsis calochlora, Missouri Botanical Garden, St. Louis, 1907.. 14 



IV. Opuntia leucotricha, natural landscape at Durango, Mexico, 1909. . . 14 

 V. Fig. 1. — Opuntia leucotricha, A. S. White Park, Riverside, Cal., 1909. 



Fig. 2. — Opuntia microdasys, A. S. White Park, Riverside, Cal., 



I 1909 16 



VI. Cereus marginatus used as a hedge plant, Encarnacion, Jalisco, 



Mexico 16 



VII. Cereus tortuosus, Missouri Botanical Garden, St. Louis, 1898 16 



VIII. Cereus eburneus, Missouri Botanical Garden, St. Louis, 1905 16 



IX. Pilocereus polylophus (Cereus nickelsii), Missouri Botanical Garden, 



! St. Louis, 1905 16 



X. Echinopsis gemmata, Missouri Botanical Garden, St. Louis, 1898 16 



XI. Cereus weberi predominating in natural landscape at Tomellin, 



Mexico, 1909 20 



XII. Cereus stellatus (in foreground), natural landscape, at Tomellin, 



Mexico, 1909. v • 20 



XIII. Fig. 1. — Pilocereus fulviceps, Tehuacan, Mexico, 1910. Fig. 2. — 



Cereus eburneus, Tomellin, Mexico, 1910 20 



XIV. Ornamental planting of cacti, Missouri Botanical Garden, St. Louis. . 20 

 XV. Mamillarias planted in formal design, Missouri Botanical Garden, 



St. Louis, 1905 22 



XVI. Cactus garden, A. S. White Park, Riverside, Cal., 1905 22 



XVII. Succulent rockery in Alamo Park, San Antonio, Tex., 1904 22 



XVIII . Echinocactus ingens, Tehuacan, Mexico, 1905 22 



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