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...
A. B. ” 1. ). Echinocactus williamsii Lem. Allg. Gart. Zeit. xiii. 385 (1845). Anhalonium williamsii Lem. in Forst Handb. Cact. i. 233 (1846). Hemispherical, from a very thick root, often densely proliferous, transversely lined below by the remains of withered tubercles: ribs usually 8 (in young specimens often 6), very broad, gradually merging above into the distinct nascent tubercles which are crowned with somewhat delicate penicellate tufts, which become rather inconspicuous pulvilli on the ribs: flowers small, whitish to rose: stigmas 4.
Longimamma (36). Radials 15 to 20: tubercles 6 to 8 mm. long. eschanzieri (21). † † 124 Central spine shorter than the radials. Radials 5 to 9, stout. meiacanthus (7). Radials 9 to 22. heyderi (5), hemisphaericus (6), gummiferus (8), gabbii (34), sphaericus (35). † * * * Central spine solitary and hooked. Stems slender cylindric: Lower Californian. † † Centrals 1, 20 to 30 mm. long. roseanus (23). Centrals 1 to 4, 20 to 50 mm. long. setispinus (24). Stems depressed-globose to ovate. † Radials 4 to 6, rigid.
The plants are simple only when young, forming at maturity bunches of 20 to 30 (or even more) cylindric heads. Dr. Merriam speaks of this species as “resembling loose clusters of cocoanuts,” and is commonly called “nigger-head” in the desert region. 2. Echinocactus polycephalus xeranthemoides, var. nov. Echinocactus xeranthemoides Engelm. MSS. 5 cm. ); the 4 centrals 3 to 5 cm. —Type, Siler of 1881 and 1883 in Herb. Mo. Bot. Gard. Extreme southwestern Utah and western Arizona, on the Kanab plateau and southward in the region of the Colorado.
A Preliminary Revision of the North American Species of Cactus... by John M. Coulter