Page:Memoir of a tour to northern Mexico.djvu/114

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mannia fumariaefolia, Sweet, was collected near Saltillo, with smaller flowers, (11/2 inch in diameter,) and near Rinconada, with larger ones, (3 inches in diameter;) an interesting plant, the eastern representative of the Californian Eschscholtzia, but perennial, with a small torus, a different stigma, etc.

I cannot omit to introduce here a beautiful shrub discovered on the rocks about Agua Nueva and Buena Vista by Dr. Gregg. Depend upon Don's characters of Cowania as correct, I must consider this plant as the type of a new genus, which I have great pleasure to dedicate to its indefatigable discoverer, my friend Dr. Josiah Gregg, whose name has already been frequently mentioned in these pages.[1] Greggia rupestris is a lovely, sweet-scented shrub, with flowers resembling roses in shape and color, so that Dr. Gregg was induced to name it the "Cliff rose."

North and northeast of Monterey we reach the lower country, and with it a different vegetation; here is the home of the shrubby Cassieae (Parkinsonia Casparea, etc.,) and Mimoseae; Sophora, Diospyros, some species of Rhus and Rhamnus are common here, as well as a climbing yellow-flowered Hiraea, while another erect red-flowered species grows on the table lands near Parras. One of the most beautiful shrubs of that district is Leucophyllum texanum, Benth., with its whitish tomentose leaves and sweetscented blue flowers. It is common from San Antonio, in Texas, to Monclova, and from Cerralbo to Camargo, but is not seen on the table-lands.



    sub-10 albidis, centralibus 3 fusco-atris, 2 minoribus sursum versis, singulo longiore porrecto; floribus in vertice lanato centralibus, ovario ianoso; sepalis sub-10 lanceolatis, acutis, integris; petalis sub-24 ovato-lanceolatis, mucronatis, integris vel versus apicem erosis; stigmatibus 7 flavis erecto-patentibus exsertis.

    Rinconada, on rocks; flowers in June. About 3 inches high, and 2 inches in diameter below; tubercles in 10 to 13 oblique rows closely adpressed, so as to give the whole plant the appearance of a pineapple or cone, tomentose in the groove and the axills, about 6 lines long; radial spines 3 to 5, central 5 to 8 lines long; flowers central, 3 to 5 in a cluster together imbedded in long and dense wool, about 15 lines long and wide; petals deep purple.

  1. Greggia, n. gen., (Greggia, Gaertn. Eugenia, Mich., fide Endlicher,) calyx tubulosus, 5-lobus, imbricatus; petala 5 calycis fauci inserta; stamina numerosissima cum petalis inserta; ovaria plura fundo calycis inserta 1-rarius 2-ovulata; stylus villosus, deciduus, stigma nudum; ovulum supra basin ovarii placentae laterali insertum, anatropum; achenia villosa, ecaudata; semen unicum erectum, embryo radicula infera.

    A Mexican shrub with small cuneate truncate dentate leaves with adnate stipules, and solitary rose-colored or purple sweetscented flowers.

    Greggia rupestris, n. sp., cliffs about Saltillo, Buena Vista, and Agua Nueva, flowers January to March; several feet high, much branched, leaves about 6 lines long, and at the apex 3 lines wide, crowded; re volute on the margin, glabrous above, tomentose beneath; flowers terminal on short branchlets 15 to 18 inches in diameter. Nearly related to Cowania, but distinguished by the imbricate, not valvate calyx, the red, not yellow flowers, and the deciduous, not persistent style.