. Annual report of the Board of Regents of the Smithsonian Institution . ^ this genus was divided into two sections;Platopuntia, including plants with flattened joints; and Cylindro-puntia, with joints cylindrical or terete. Various other classfica-tions have been proposed, the latest and most satisfactory of whichis that of Britton and Eose, who divide the genus into a number ofgroups which they call those occurring in Mexicoare the following: Clavatse, in which the jointsare cylindrical or clubshaped andthe spines unsheathed. Examples:Opuntia hulhispina, a prostratespecies with
. Annual report of the Board of Regents of the Smithsonian Institution . ^ this genus was divided into two sections;Platopuntia, including plants with flattened joints; and Cylindro-puntia, with joints cylindrical or terete. Various other classfica-tions have been proposed, the latest and most satisfactory of whichis that of Britton and Eose, who divide the genus into a number ofgroups which they call those occurring in Mexicoare the following: Clavatse, in which the jointsare cylindrical or clubshaped andthe spines unsheathed. Examples:Opuntia hulhispina, a prostratespecies with spines bulbous at thebase, often forming thickets in theState of Coahuila, north of Par-ras; Op>untia emovyi of Chihuahuaand Sonora; and Opuntia hrad-tiana {Cereus hradtianus Coult.),a cereus-like erect species growingin Coahuila. Cylindracese, with compara-tively stout joints, and spines. Fig. 12 1 ii 1 • 11 1 -IT r Hi. —\\o (Opuntia leptocauUs.) sheathed m scabbards, including the coyonostlis, or cardenches, Opuntia imhricata and O. arhorescens, and the clavellinas, or abrojos, Opuntia tunicata (pi. 10, fig. 5). Monacanthse, also with sheathed spines but with slender-branchedstems and a bushy habit of growth; including the tasajillos of north-ern and central Mexico Opuntia leptocaulis (fig. 12), with scarlet orcoral-red fruit, and 0. kleinicp, with somewhat stouter stems andyellowish fruit. An interesting feature of these plants is that thefruit is often proliferous; that is, branches and flowers frequentlygrow from the areoles of the cuticle covering the fruit itself. Pubescentes, with pubescent joints and sometimes without spines,though usuall}^ rich in bristles; including Opuntia 7mfida and (pi. 10, fig. 4), usually called nopalillos cegadores, °- Britton and Rose. A preliminary treatment of the Opuntioideae of NorthAmerica. Smithsonia
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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
