Page:Memoir of a tour to northern Mexico.djvu/105

cultivation; but have not seen as yet flowers or fruit from any of them; still they cannot but belong to my genus Echinocereus, to judge from analogy.

Some Mammillariae of Cosihuiriachi are distinguished by their compact shape; the tubercles are very short, globose, or even hemispherical, the spines strong, numerous, radiating, and ad pressed, the fruits central from a woolly vertex: Mammillaria compacta.^[1] Another, M. gummifera,^[2] belongs together with two species from Texas, and from the mouth of the Rio Grande to the section Angulares, with pyramidal 4 angled tubercles, and milky juice, which, hardening, forms a gum. A third species belongs to Crinitae, and is a most elegant little plant with numerous hairlike radiating and one stout, hooked central spine; I have named it M. barbata.^[3]

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spines or bristles 1 to 2, lower about 4, and lateral 7 to 9 lines long; central spine much stouter, 1 inch long.

1. 32 Mammillaria compacta, n. sp., simplex, hemisphaerica, s. depressoglobosa; tuberculis abbreviatis, ovoideo-conicis, sulcatis; areolis ovato-Ianceolatis, junioribus albo-tomentosis; aculeis omnibus radialibus, 13-16 subaequalibus, robastis, recurvatis, adpressis, intertextis, albidis, superioribus apice fuscis; sulcis tuberculorum axillisque junioribus et vertice tomentosis; floribus in vertice congestis; baccis ellipticis perigonio coronatis, viridibus; seminibus obovatis, laevibus, fulvis.

   Cosihuiriachi.—Plant 2 to 31/2 inches in diameter and 11/4 to 21/2 inches high; tubercles in 13 rows, 4 lines high, 6 lines wide at base; spines interlocking, and thereby often deformed and twisted, stout, 7 to 10 lines long.

2. Mammillaria gummifera, n. sp., lactiflua, simplex, hemisphaerica, tuberculis quadranguiato-pyramidatis; axillis areolisque junioribus albotomentosis; aculeis rectis, radialibus 10-12, inferioribus robustis, apice fuscis superiores setaceos albidos ter superantibus; centralibus 1-2 robustis, brevibus, fuscis, porrectis.

   Cosihuiriachi.—From 3 to 5 inches in diameter, 21/2 to 4 inches high; when wounded it exudes a milky fluid, which, hardening, forms a transparent or whitish gum; tubercles mostly in 13 oblique rows, 6 to 7 lines long, and 5 to 6 lines wide at base; upper spines 2 to 3, lower 6 to 7, central about 2 lines long. Flowers and fruit not seen, but probably like those of two similar species, M. applanata, Engelm. ined.,from the Pierdenaies, in Texas, and M. hemisphaerica, Engelm. ined., from the mouth of the Rio Grande; both are also simple, lactescent, with pyramidal tubercles, and both have small reddish white flowers, and long clavate scarlet berries, without the remnants of the flower. It is a fact which I have repeatedly observed, and in a considerable number of species, that the redglobose, or clavate-berries of the mammillariae are always destitute of the remnants of the perigon, etc.; but the oval green fruits always are topped with it.

3. Mammillaria barbata, n. sp., simplex, globoso-depressa; tuberculorum axillis nudis; aculeis radialibus numerosissimis pluriserialibus, exterioribus pilifbrmibus albis sub-40; interioribus paulo robustioribus fulvis 10-15, centrali singulo robusto, uncinato, fusco, erecto; baccis oblongis, viridibus, apice floris rudimento coronatis.