Contributions from the U.S. National Herbarium. Vol. III.

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Extra resources for Contributions from the U.S. National Herbarium. Vol. III.

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2 mm. long. (Ill. Cact. Mex. Bound. t. 74, figs. 11-14, seeds)—Type unknown, but probably Poselger of 1850 in Herb. Mo. Bot. Gard. From the Rio Grande, near Eagle Pass, and the San Pedro and Pecos, Texas, westward to Arizona (near Comstock) and southward into Coahuila. Specimens examined: Texas (Wright of 1852, on the Limpia, also 2, 223, 639): Arizona (Nealley of 1891, near Comstock): Coahuila (Poselger of 1850). Extending from San Antonio, Texas, westward to the region of Eagle Pass and El Paso and southward into Coahuila and Chihuahua.

Echinocactus acifer Hopf. ex Foerst. Handb. Cact. 520 (1846). Depressed-globose, 6 cm. in diameter, simple, densely woolly on the younger areolæ: ribs 36 to 40, oblique, crowded, thin and acute, very 372 wavy and tuberculate-interrupted: radial spines 14 to 22, setaceous and white, more or less rigid, 12 to 14 mm. —Type unknown. San Luis Potosi. Specimens examined: San Luis Potosi (Eschanzier of 1891). Two forms appear in the Eschanzier collection: one with about 20 radials and 4 centrals, of which the laterals are twice as long as the upper; the other with 11 radials and 3 centrals (the lowest one wanting), of which the laterals are not twice as long as the upper.

Long: fruit unknown. (Ill. l. )—Type unknown. Chihuahua, Coahuila, and San Luis Potosi. Specimens examined: Chihuahua (Wislizenus of 1846; Potts of 1850; Evans of 1891): Coahuila (Palmer 379): San Luis Potosi (Palmer of 1879; Eschanzier of 1891): “Northern Mexico” (Poselger): also specimens cultivated in Mo. Bot. , 1881, and in Harvard Bot. , 1882. The radial spines usually number 9 to 11, but the Chihuahua specimens of Evans show 14 to 17, thus resembling schottii. The chief distinctive character between the two is found in the relative development of the of centrals, in bicolor the lowest, in schottii the uppermost being the most prominent.

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