. The Cactaceae : descriptions and illustrations of plants of the cactus family. FEROCACTUS. 139 Echinocactus pfersdorffii Hortus may be referable here. It is probable that E. pfers- dorffii Hildmann Catalogue (Monatssehr. Kakteenk. 5: 92. 1905) is the same, but neither was accompanied by a description. In cultivation this plant is simple, depressed-globose, dm. in diameter, but in the wild state sometimes cylindric and up to 6 dm. high, and described as proliferous; ribs 20, perhaps even more, acute; areoles rather large, distant; radial spines usually 8, subulate, somewhat curved, cm
. The Cactaceae : descriptions and illustrations of plants of the cactus family. FEROCACTUS. 139 Echinocactus pfersdorffii Hortus may be referable here. It is probable that E. pfers- dorffii Hildmann Catalogue (Monatssehr. Kakteenk. 5: 92. 1905) is the same, but neither was accompanied by a description. In cultivation this plant is simple, depressed-globose, dm. in diameter, but in the wild state sometimes cylindric and up to 6 dm. high, and described as proliferous; ribs 20, perhaps even more, acute; areoles rather large, distant; radial spines usually 8, subulate, somewhat curved, cm. long; central spines usually solitary, but as many as 4 reported, all yellow. We have followed Schumann in refer- ring here various synonyms, but the indi- cations are that we have more than one species. Dr. Rose obtained flowers of this species at La Mortola in 1912 and his notes were used in drawing up the description. Here belongs Cactus multangularis Mocifio and Sesse (Mem. Mus. Hist. Nat. Paris 17: 38. 1828), but never described by them. Echinocactus electracantlms rufispinus (Monatssehr. Kakteenk. 3: 70. 1893) we would also refer here. Echinocactus hystrichacanthus Lemaire (Cact. Gen. Nov. Sp. 17. 1839) may be of this relationship. This species as well as E. pyenoxyphus Lemaire (Cact. Gen. Nov. Sp. 16. 1839) Weber considered as only varieties of E. hystrix. Illustrations: De Candolle, Mem. Mus. Hist. Nat. Paris 17: pi. 10, as Echinocactus melocactijormis; Monatssehr. Kakteenk. 3: or o 1 r\ . 1 Fig. 146.—Ferocactus melocactiformis. 158. f. 2; 21: 171; Schumann, Gesamtb. 4 Kakteen f. 58, as Echinocactus electracantlms; Bliihende Kakteen 1: pi. 22, as Echinocactus in gens. Figure 146 is copied from the first illustration above cited. 22. Ferocactus macrodiscus (Martius). Echinocactus macrodiscus Martius, Nov. Act. Nat. Cur. 16; 341. 1832. Echinocactus macrodiscus laevior Monville in Labouret, Monogr. Cact. 197. 1853. Echinocactus macrodiscus decolor Monville in Labouret,
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