THE CACTACEAE- 
198 
Type locality: Chubut, Argentina. 
Distribution: Southern Argentina. 
This species has been very confusing not only as to its identification, but as to its generic 
relationship. It is possible that more than one species has been treated here. The plant 
grows in barren regions, often among boulders where there is no other vegetation. 
Figure 213 is from a photograph taken by Mr. Walter Fischer at General Roca, Rio 
Negro, showing how the plant grows in its natural surroundings; figure 214, showing a 
potted plant, and figure 215, the top of a flowering plant, are from photographs contributed 
by Mr. C. Bruch. 
17 . Malacocarpus erinaceus (Haworth) Riimpler in Forster, Handb. Cact. ed. 2. 455. 1885. 
Cactus erinaceus Haworth, PI. Succ. Suppl. 74. 1819. 
Echinocactus poliacanthus Link and Otto, Verh. Ver. Beford. Gartenb. 3: 422. 1827. 
Melocactus poliacanthus Link and Otto, Verh. Ver. Beford. Gartenb. 3: pi. 16, f. 1. 1827. 
Echinocactus corynodes Otto in Pfeiffer, Enum. Cact. 55. 1837. 
Echinocactus erinaceus Lemaire, Cact. Aliq. Nov. 16. 1838. 
Malacocarpus corynodes Salm-Dyck, Cact. Hort. Dyck. 1849. 25. 1850. 
Malacocarpus corynodes erinaceus Salm-Dyck, Cact. Hort. Dyck. 1849. 25. 1850. 
Malacocarpus polyacanthus Salm-Dyck, Cact. Hort. Dyck. 1849. 25. 1850. 
Malacocarpus acuatus Salm-Dyck, Cact. Hort. Dyck. 1849. 25. 1850. 
Echinocactus corynodes erinaceus Labouret, Monogr. Cact. 170. 1853. 
Echinocactus acuatus corynodes Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 494. 1905. 
Echinocactus acuatus depressus Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 494. 1905. 
Echinocactus acuatus erinaceus Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 495. 1905. 
Echinocactus leucocarpus Arechavaleta, Anal. Mus. Nac. Montevideo 5: 239. 1905. 
Simple, globular to short-cylindrie, 15 cm. high, very woolly at top, up to 15 cm. high; ribs 15 to 
20, obtuse, strongly undulate; areoles borne in the depressions on ribs, felted when young; radial 
spines 6 to 8, subulate, yellowish, 1 to 2 cm. long; central spine solitary; flowers yellow, 4 to 5 cm. 
long, 7 cm. broad when fully open; inner perianth-segments spreading, oblong to spatulate, acute, 
often serrate above; stigma-lobes bright red. 
Type locality: Not cited. 
Distribution: Southern Brazil and adjacent parts of Argentina and Uruguay. 
Schumann was inclined to refer here Echinocactus aciculatus Salm-Dyck (Hort. Dyck. 
341. 1834; Malacocarpus aciculatus Salm-Dyck, Cact. Hort. Dyck. 1849. 25. 1850) and 
