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By John M. Coulter

Contributions from the U.S. nationwide Herbarium, 1894.

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Extra resources for A Preliminary Revision of the North American Species of Cactus...

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277 (1856). Echinocactus laticostatus Engelm. & Bigel. Pacif. R. Rep. iv, 32 (1856). Glaucous, depressed-globose or at length ovate or even cylindric with age, 4 to 20 cm. 5 to 15 cm. in diameter, simple: ribs 8 to 10 (fewer in very young specimens), often spirally arranged, the tubercles scarcely distinct by inconspicuous transverse grooves: spines 6 to 9, stout, compressed, reddish (at length ashy), recurved or sometimes almost straight, nearly equal, 2 to 4 cm. long (sometimes long and slender and almost terete, sometimes short, stout and broad); radials 5 to 8, upper ones weaker, lowest wanting; a single stouter decurved central (sometimes wanting): flowers pale-rose to purple, 6 cm.

13 (1827). —Astrophytum Lem. (1839); Gymnocalycium Pfeiff. (1844); Malacocarpus Salm-Dyck (1850). † As the genera of Cactaceæ have no very definite boundaries it is to be expected that Echinocactus will be found merging into neighboring genera. The mamillate forms, such as E. simpsoni, are clearly intermediate between Cactus and Echinocactus, but are nearer the latter in what are considered the more essential characters; while the oval and cylindric forms look toward certain species of Cereus, though the general globose outline is well maintained.

Among the Mexicans both E. wislizeni and E. ” 16. Echinocactus wislizeni albispinus Toumey, Gard. & For. viii, 154 (1895). Differs from lecontei in being oblong, and in the much fewer radials (11 in all, 2 upper and 3 to 5 lower rigid, and 2 or 3 laterals on each side flexuous), all of which (or only the flexuous ones) are whitish. (Ill. l. )—Type in Toumey Herb. Southern Arizona and Lower California. Specimens examined: Arizona (J. W Toumey of 1892, near Tucson) Lower California (M. E. ) There can be no doubt but that this form with much fewer radial spines occurs throughout the range of lecontei, to which it is most closely allied.

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A Preliminary Revision of the North American Species of Cactus... by John M. Coulter

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