By John M. Coulter
Contributions from the U.S. nationwide Herbarium, 1894.
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Echinocactus polycephalus Engelmann. ; Engelm. Syn. Cact. 276 (1856). Globose (15 to 25 cm. in diameter) to ovate (25 to 40 cm. 5 to 25 cm. in diameter) and cylindrical (reaching 60 to 70 cm. high and about 25 cm. in diameter), profusely branched at base: ribs 13 to 21 (occasionally 10): spines 8 to 15, very stout and compressed, more or less recurved and reddish; radials 4 to lit comparatively slender (the 1 Morphologie und Biologie der Cacteen. 5 to 5 cm. ), very unequal, the uppermost one usually the broadest and curved upward, the lowest one usually the longest and decurved: flowers yellow: fruit globose, 16 to 20 mm, in diameter: seeds irregularly ungulate and minutely tuberculate, 4 mm.
1883. 365 18. Echinocactus pilosus pringlei, var. nov. 5 to 4 cm. —Type, Pringle 151 in Herb. Gray. Coahuila. Specimens examined: Coahuila (Pringle 154. distributed as pilosus). —Hamati. Central spines annulate. 19. Echinocactus hamatocanthus Muhlenpf. Allg. Gart. Zeit. xiv, 371 (1816). Echinocactus longihamatus gracilispinus Engelm. Syn. Cact. 273 (1856).
Acad. Brux. vi, 88 (1839). Echinocactus horizonthalonius centrispinus Engelm. Syn. Cact. 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.