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

By John M. Coulter

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

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1893. The extreme specific and varietal forms seem worthy of specific distinction, but abundant growing material in Mo. Bot. Gard. showed such complete intergradation that a specific line of separation was found to he impossible. The varietal form is said to be an important one in the ceremonial rites of the Indians. GEOGRAPHICAL DISTRIBUTION. These forms are evidently Mexican in origin, and the specimens seen are all from the Rio Grande region. They have crossed that river below the “Great Bend,” and probably belong to lower-lying, more eastern Mexican provinces than do the species of Anhalonium.

Engelmaun’s types and unpublished notes. It may be well to repeat the statement here that all known forms within the United States have been included, but only such Mexican and West Indian forms as could be personally examined. A maze of names and descriptions have been handed down in various writings, but it would be of no advantage to introduce them except as substantiated by specimens. John M. Coulter. University Of Chicago. 355 ECHINOCACTUS, CEREUS, AND OPUNTIA. 4. ECHINOCACTUS Link & Otto, Verb.

Pl. Fendl. 49 (1849), not Haw. (1819). Mamillaria radiosa Engelm. Pl. Lindh. 196 (1850). Mamillaria vivipara radiosa texana Engelm. Syn. Cact. 269 (1856). 5 cm. high and about 5 cm. in diameter, simple or sparingly proliferous: tubercles terete, more or less grooved above, 8 to 12 mm. long: radial spines 20 to 30, straight, slender, white with dusky apex, very unequal, 6 to 8 mm long; central spines 4 or 5, stouter, yellowish or tawny, 8 to 12 mm. 5 cm. long, about the same diameter when fully open, violet to dark purple: stigmas 7 to 9, obtuse: fruit oval and green: seeds yellowish or brown, obovate, pitted, fully 2 mm, long.

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


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