. Carnegie Institution of Washington publication. . 30 THE CACTACEAE. Type locality: Guadalajara, Mexico. Distribution: In hedges about Guadalajara, Mexico. The fruit, called in Mexico tuna de agua and tasajillo, is used in making a cooling drink and for preserves. Opuntia spathnlata aquosa (Bull. Mus. Hist. Nat. Paris 4: 165. 1898) was given as a synonym of this species, but was never published. Illustration: Safford, Ann. Rep. Smiths. Inst. 1908: pi. 10, f. 2. Figure 27 represents a leafy shoot of the plant collected by W. E. Safford near Guadalajara, Mexico, in 1907. 10. Pereskiopsis keller
. Carnegie Institution of Washington publication. . 30 THE CACTACEAE. Type locality: Guadalajara, Mexico. Distribution: In hedges about Guadalajara, Mexico. The fruit, called in Mexico tuna de agua and tasajillo, is used in making a cooling drink and for preserves. Opuntia spathnlata aquosa (Bull. Mus. Hist. Nat. Paris 4: 165. 1898) was given as a synonym of this species, but was never published. Illustration: Safford, Ann. Rep. Smiths. Inst. 1908: pi. 10, f. 2. Figure 27 represents a leafy shoot of the plant collected by W. E. Safford near Guadalajara, Mexico, in 1907. 10. Pereskiopsis kellermanii Rose, Smiths. Misc. Coll. 50: 332. 1907. Stem glabrous, herbaceous, weak, and clambering over shrubs to a length of 4 to 5 meters, about 2 cm. in diameter; second-year branches usually at right angles to main stem, with cherry- red bark; old stem bearing several slender, acicular brown spines, sometimes only i, sometimes wanting, and numerous brown glochids; young branches green, fleshy, their areoles circular, white, filled with long white hairs, brown glochids, and often with several acicular brown spines; spines on wild plants often stout, usually solitary, nearly black, 2 to 3 cm. long; leaves various, shining green, glabrous, thickish, elliptic and two or three times as long as wide, or suborbicular, acute at the apex, narrowed at the base, 5 cm. long or less, 2 to cm. broad; flowers not known; fruit red, glabrous, leafy, 3 to 6 cm. long, bearing large areoles filled with brown glochids; seeds covered with matted hairs. FIGS 28, 29, and 30.—Pereskiopsis keller- TypC locality. Trapicllite, Guatemala. manii, showing three leaf forms. Distribution: Guatemala. Figures 28, 29, and 30 are copied from sketches of the leaf-forms of the type plant, made by W. A. Kellerman in Guatemala in 1908. 2. PTEROCACTUS Schumann, Monatsschr. Kakteenk. 7: 6. 1897. Stems low, more or less branched above, cylindric, from tuber-like and often greatly enlarged roots; leaves minute
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