. Carnegie Institution of Washington publication. ACANTHOCEREUS. 123 plant comes from near the type locality of Cactus pita Java Jacquin, but we refer that species to A. pentagon us, also found in northern Colombia. The species is near ,4. JiorriJits, but has a much longer flower-tube. 3. Acanthocereus pentagonus (Linnaeus) Britton and Rose, Contr. U. S. Nat. Herb. 12: 432. 1909. Cactus pentagonus Linnaeus, Sp. PI. 467. 1753. Cactus pitajaya Jacquin, Enum. PI. Carib. 23. 1761. Cereus pentagonus Haworth, Syn. PI. Succ. 180. 1812. Cactus prismaticus Willdenow, Enum. PI. Suppl. 32. 1813. Cereus p
. Carnegie Institution of Washington publication. ACANTHOCEREUS. 123 plant comes from near the type locality of Cactus pita Java Jacquin, but we refer that species to A. pentagon us, also found in northern Colombia. The species is near ,4. JiorriJits, but has a much longer flower-tube. 3. Acanthocereus pentagonus (Linnaeus) Britton and Rose, Contr. U. S. Nat. Herb. 12: 432. 1909. Cactus pentagonus Linnaeus, Sp. PI. 467. 1753. Cactus pitajaya Jacquin, Enum. PI. Carib. 23. 1761. Cereus pentagonus Haworth, Syn. PI. Succ. 180. 1812. Cactus prismaticus Willdenow, Enum. PI. Suppl. 32. 1813. Cereus prismaticus Haworth, Suppl. PI. Succ. 77. 1819. Cereus pitajaya De Candolle, Prodr. 3: 466. 1828. ^Cereus undulosus De Candolle, Prodr. 3: 467. 1828. ICactus undulosus Kosteletzky, Allg. Med. Pharm. Fl. 4: 1393. 1835. Cereus cognatus Pfeiffer, Enum. Cact. 106. 1837, as synonym. Cereus acutangulus Otto in Pfeiffer, Enum. Cact. 107. 1837. Cereus princeps Pfeiffer, Enum. Cact. 108. 1837. Cereus ramosus Karwinsky in Pfeiffer, Enum. Cact. 108. 1837. Cereus baxaniensis Karwinsky in Pfeiffer, Enum. Cact. 109. 1837. Cereus variabilis Engelmann, Bost. Journ. Nat. Hist. 5: 205. 1845. Not Pfeiffer, 1837. Cereus nitidus Salm-Dyck, Cact. Hort. Dyck. 1849. 211. 1850. Cereus vasmeri Young, Fl. Texas 276. 1873. Cereus dussii Schumann, Gesamtb. Kakteen 89. 1897. Cereus sirul Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 384. 1904. Stem clambering, usually 2 to 3, sometimes 7 meters high, but when growing in the open more or less arched and rooting at the tips, then making other arches and thus forming large colonies; old trunk becoming nearly round, 5 cm. in diameter or more, covered with a thick mucilaginous, spineless cortex and a hard-wood axis with only a small pithy cavity; joints 3 to 8 cm. broad, 3 to 5-angled, low-crenate; juvenile growth nearly terete, with 6 to 8 low ribs, approximate areoles and numerous short acicular spines; areoles on normal branches 3 to 5 cm. apart; spines g
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