North American Species of Cactus

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Author: John Merle Coulter

58. Cactus Radiosus (Engelm.).

Mamillaria vivipara Engelm. Pl. Fendl. 49 (1849), not Haw.
(1819).
Mamillaria radiosa Engelm. Pl. Lindh. 196 (1850).
Mamillaria vivipara radiosa texana Engelm. Syn. Cact. 269
(1856).

Ovate or cylindrical, 5 to 12.5 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, with with dusky apex, very unequal, 6 to 8 mm long; central spines 4 or 5, stouter, yellowish or tawny, 8 to 12 mm. long, the upper ones the longer and more robust, the lowest one shorter and porrect: flowers 3.5 to 5.5 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. (Ill. Cact. Mex. Bound. t. 74, fig.5, seeds) Type, Lindheimer of 1846 in Herb. Mo. Bot. Gard.

Extending across southern Texas, from the Guadalupe to El Paso. thence into contiguous New Mexico and across the Rio Grande near Juarez (northern Chihuahua). Fl. May-June.

Specimens examined: Texas (Lindheimer of 1846): New Mexico (Bigelow of 1855): Chihuahua, near Juarez (Evans of 1891): also specimens cultivated from the type in St. Louis in 1846.

Attention has been called under C. viviparus to the characters that distinguish from C. radiosus The characters there given for the latter species apply to to the whole group of included forms. The type of the species is the var. Texana of Engelmann’s Syn. Cact. and Mex. Bound., which is characterized in the above. description.

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Chicago: John Merle Coulter, "58. Cactus Radiosus (Engelm.).," North American Species of Cactus, ed. Smiles, Samuel, 1812-1904 in North American Species of Cactus Original Sources, accessed August 14, 2022, http://www.originalsources.com/Document.aspx?DocID=4951UEBS49WWPK9.

MLA: Coulter, John Merle. "58. Cactus Radiosus (Engelm.)." North American Species of Cactus, edited by Smiles, Samuel, 1812-1904, in North American Species of Cactus, Original Sources. 14 Aug. 2022. http://www.originalsources.com/Document.aspx?DocID=4951UEBS49WWPK9.

Harvard: Coulter, JM, '58. Cactus Radiosus (Engelm.).' in North American Species of Cactus, ed. . cited in , North American Species of Cactus. Original Sources, retrieved 14 August 2022, from http://www.originalsources.com/Document.aspx?DocID=4951UEBS49WWPK9.