. Carnegie Institution of Washington publication. MYRTILLOCACTUS. 179 Type species: Ccrciis geometrizans Martius. This genus has no very close allies. We have grouped it with Lophocereus and the fol- lowing genus, because they likewise have more than i flower from an areole, but otherwise little else in common. The small flowers somewhat resemble orange flowers, having scarcely any tubes; the short stamens are almost entirely exserted. The fruits are small berries. We know 4 closely related species, natives of Mexico and Guatemala. The name is from the Greek, signifying berry-cactus, referring
. Carnegie Institution of Washington publication. MYRTILLOCACTUS. 179 Type species: Ccrciis geometrizans Martius. This genus has no very close allies. We have grouped it with Lophocereus and the fol- lowing genus, because they likewise have more than i flower from an areole, but otherwise little else in common. The small flowers somewhat resemble orange flowers, having scarcely any tubes; the short stamens are almost entirely exserted. The fruits are small berries. We know 4 closely related species, natives of Mexico and Guatemala. The name is from the Greek, signifying berry-cactus, referring to the small FIG. 252.—Cross-Section of stem of Lophocereus schottii. Xo-5- FIG. 253.—Flower of Lophocereus schottii. Natural size. FIG. 254.—Section of rib of Myrtillo- cactus geometrizans with fruit at the areoles. FIG. 255.—Flower of same. KEY TO SPECIES. Young branches very blue; central spine elongated, reflexed, dagger-like i. M. geomelrizans Young branches green; central spine not dagger-like. Spines usually 3 to 5, ascending, with no definite central spine or, when present, very short. .2. M. cochal Spines 6 or more, with definite central spine. Radial spines 5; fruit oblong, 10 to 15 mm. long 3. M. schenckii Radial spines more than 5; fruit globular, 6 mm. in diameter 4. M. cichlamii 1. Myrtillocactus geometrizans (Martius) Console, Boll. R. Ort. Bot. Palermo i: 10. 1897. Gereus geometrizans Martius in Pfeiffer, Enum. Cact. 90. 1837. Cereus pugioniferus Lemaire, Cact. Aliq. Nov. 30. 1838. Cereus gladiator Otto and Dietrich, Allg. Gartenz. 6: 34. 1838. Cereus geometrizans pugioniferus Salm-Dyck, Cact. Hort. Dyck. 1849. 48. 1850. Cereus geometrizans qiiadrangularispinus Lemaire in Labouret, Monogr. Cact. 367. 1853. Tree-like, with a short definite trunk crowned by a large, much branched top; branches often a little curved, bluish green, usually 5 or 6-ribbed, 6 to 10 cm. in diameter, very blue when young; ribs 2 to 3 cm. high, rounded; areole
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