The Cactaceae : descriptions and illustrations of plants of the cactus family . but is not formally published at the place here cited. Cereus lateribarbatus (Rev. Hort. 1862: 427. 1862) belongs here, according to Lemaire. Illustrations: Blanc, Cacti 77. f. 1715; Rev. Hort. 62: 129. f. 40, as Pilocereuscolumna-trajani; Mollers Deutsche Gart. Zeit. 29: 354. f. 9; MacDougal, Bot. N. pi. 22, as Pilocereus tetetzo; Schelle, Handb. Kakteenk. f. 43, as Cephalocereuscolumna-trajani. Plate xii is from a photograph taken by Dr. MacDougal at Tomellin Canyon, Mexico. Cereus tetazo Coulter (Contr
The Cactaceae : descriptions and illustrations of plants of the cactus family . but is not formally published at the place here cited. Cereus lateribarbatus (Rev. Hort. 1862: 427. 1862) belongs here, according to Lemaire. Illustrations: Blanc, Cacti 77. f. 1715; Rev. Hort. 62: 129. f. 40, as Pilocereuscolumna-trajani; Mollers Deutsche Gart. Zeit. 29: 354. f. 9; MacDougal, Bot. N. pi. 22, as Pilocereus tetetzo; Schelle, Handb. Kakteenk. f. 43, as Cephalocereuscolumna-trajani. Plate xii is from a photograph taken by Dr. MacDougal at Tomellin Canyon, Mexico. Cereus tetazo Coulter (Contr. U. S. Nat. Herb. 3: 409. 1896; Pilocereus tetetzo Weber inSchumann, Gesamtb. Kakteen 175. 1897), which we first confused with Pachycereuscolumna-trajani, is not of this genus, for its ovary is glabrous and the fruit more or lessfleshy and edible. Coulter, however, does state that it is closely related, if not identical,with one of the species of this genus, that is, Pachycereus pecten-aboriginum. It should becompared with Cephalocereus macrocephalus. BRITTON AND ROSE. LEPTOCEREUS. 77 10. LEPTOCEREUS (Berger) Britton and Rose, Contr. U. s. Nat. Herb. 12: [909. Arborescent, bush-like,vine-like, or diffusely branching cacti; joints with 3 to 8 prominent, thin,high, crenate ribs, without aerial roots; spines slender, aeieular; flowers diurnal, small; pvary spins;flower-tube short, campanulate, spiny; stamens very aumerous, borne at the base of the throat,scarcely exserted; stigma-lobes a little exceeding the stamens; fruit globose to oblong, more or lessspiny, fleshy; seeds numerous, black. Type species: Cereus assurgens Grisebach. This genus is composed of eight species, six of them Cuban, one Santo Domingan, andone Porto Rican. Some are weak and clambering; others develop woody trunks. Thebranches are strongly ribbed and armed with clusters of long aeieular spines. The earliestspecies were referred to Cereus. Leptocereus assurgens and L. quadricostatus, the onlyspec
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