. Annual report of the Board of Regents of the Smithsonian Institution . pecies in-digenous to the coast of Western Mexico, among them Rathhuniaalamosensis {Cereus aJamosensis Coulter), a plant with sharp irregu-lar ribs, brown velvety areoles, stout spines, and bright salmon-coloredtrumpet-shaped day-blooming flowers, first collected by Doctor Pal-mer, near Alamos, southern Sonora. Nyctocereus, the type of which, Nyctocereus serpentinus, calledjunco espinoso in the State of Jalisco, is often seen in species has straggling cylindrical fluted stems and branches withnumerous are
. Annual report of the Board of Regents of the Smithsonian Institution . pecies in-digenous to the coast of Western Mexico, among them Rathhuniaalamosensis {Cereus aJamosensis Coulter), a plant with sharp irregu-lar ribs, brown velvety areoles, stout spines, and bright salmon-coloredtrumpet-shaped day-blooming flowers, first collected by Doctor Pal-mer, near Alamos, southern Sonora. Nyctocereus, the type of which, Nyctocereus serpentinus, calledjunco espinoso in the State of Jalisco, is often seen in species has straggling cylindrical fluted stems and branches withnumerous areoles bearing a tuft of white wool and weak radiating Engelmanu, George. Cactacese of the Mexican Boundary, p. 46. 1859. * Britton, N. L., and Rose, J. N. A New Genus of Cactacese. Journ. NewYorlv Bot. Garden, vol. 9, p. 185. 1908. •See Coville, Fi-edericli V., and MacDougal, D. T., Desert Botanical Labora-tory of tlie Carnegie Institution, Publication No. 6 of ttie Carnegie Institutionof Washington. 88292—SM 1908 36 552 ANNUAL REPORT SMITHSONIAN INSTITUTION, Pig. 15.—Cepbalo-cereus senilis. bristle-like spines. The large white flowers are night blooming, andthe fruit contains a few large seeds imbedded in red pulp. Cephalocereus, in which the flower-bearing portion is differentiatedfrom the rest in the form of a woolly head, or cephalium, near theapex of the stem, either symmetrical and terminalor one-sided. The fruit (fig. 16), covered with abare skin becomes shriveled with age. Examples:C ephaloceTeus senilis^ the cabeza de vie jo, or oldmans head, of the limestone cliffs of Hidalgo,Guanajuato, and Puebla; C. cometes^ of San LuisPotosi; and G. palmeri (organo), of Victoria,Tamaulipas. Lophocereus, in which the stem and branches areribbed very much as in Myrtillocactus, and the are-oles are remote on the sterile portions but crowdedon the flower-bearing branches, and on the latterproduce short white wool and long stiff : Lophocereus schottii, the s
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