200 THE CACTACEAE. 
although we are aware that Schumann refers it first to Malacocarpus polyacanthus and 
afterwards to Echinocactus ertnaceus. 
Illustrations: Link and Otto, Icon. Pl. Rar. pl. 40, as Echinocactus langsdorfii; Nov. 
Act. Nat. Cur. 16: pl. 13, as Cactus langsdorfit. 
Figure 217 is copied from the second illustration cited above. 
19. Malacocarpus mammulosus (Lemaire). 
_? Echinocactus mammulosus Lemaire, Cact. Alig. Nov. 40. 1838. 
Echinocactus hypocrateriformis Otto and Dietrich, Allg. Gartenz. 6: 169. 1838. 
> Echinocactus submammulosus Lemaire, Cact. Gen. Nov. Sp. 20. 1839. 
Echinocactus pampeanus Spegazzini, Contr. Fl. Vent. 27. 1896. 
Echinocactus acuatus arechavaletai Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 494. 1905. 
Echinocactus mammulosus submammulosus Spegazzini, Anal. Mus. Nac. Buenos Aires IIT. 4: 496. 1905. 
Echinocactus mammulosus pampeanus Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 496. 1905. 
Echinocactus mammulosus hircinus Spegazzini, Anal. Mus. Nac. Buenos Aires II. 4: 496. 1905. 
Echinocactus mammulosus typicus Spegazzini, Anal. Mus. Nac. Buenos Aires IIT. 4: 496. 1905. 
Echinocactus floricomus Arechavaleta, Anal. Mus. Nac. Montevideo 5: 183. 1905. 
Echinocactus pampeanus charruanus Arechavaleta, Anal. Mus. Nac. Montevideo 5: 193. 1905. 
Echinocactus pampeanus rubellianus Arechavaleta, Anal. Mus. Nac. Montevideo 5: 194. 1905. 
Echinocactus pampeanus subplanus Arechavaleta, Anal. Mus. Nac. Montevideo 5: 194. 1905. 
Echinocactus arechavaletai Schumann in Arechavaleta, Anal. Mus. Nac. Montevideo 5: 208. 1905. Not 
Spegazzini, Jan. 1905. 
Simple, nearly globose, about 8 cm. high, light shining green; ribs 18 to 25, strongly tuberculate, 
almost covered by the numerous interlocking spines; radial spines 20 to 30, 5 cm. long; central spines 
2 to 4, about 2 cm. long; flowers yellow, 3.5 to 4 cm. long; scales of the ovary woolly and setose in 
their axils. 
Fics. 218 and 219.—Malacocarpus mammulosus. 
Type locality: Not cited. 
Distribution: Brazil, Uruguay, and Argentina. 
Labouret (Monogr. Cact. 228, 229. 1853) mentioned three varieties of this species as 
follows: spinosior Haage, cristatus Monville, and minor Monville. 
Echinocactus hypocrateriformis spinosior Haage probably should be referred here. 
Spegazzini (Anal. Mus. Nac. Buenos Aires III. 4: 496. 1905) referred the species pam- 
peanus and submammulosus as varieties of this species. 
Illustrations: Schelle, Handb. Kakteenk. 181. f. 115; Knippel, Kakteen pl. 9; Cact. 
Journ. 2: 102; Anal. Mus. Nac. Montevideo 5: pl. 3, as Echinocactus mammulosus; Martius, 
Fl. Bras. 4°: pl. 51, f. 2, as Echinocactus hypocrateriformis; Anal. Mus. Nac. Montevideo 5: 
