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Thelocactus leucacanthus ssp. leucacanthus (Zucc. ex Pfeiffer ) Britton & Rose.
Basionym: Echinocactus leucacanthus Zucc. ex Pfeiffer, Enum. Cact. 66 (1837).
Lectotype: Abh. Bayer. Akad. Wiss. München 2: Tab.II (1837).
Synonyms: Ferocactus leucacanthus N. P. Taylor Cact. Succ. J. Gr. Brit. 41: 90 (1979). Cereus maelenii Pfeiffer, Allg. Gartenz. 5: 378 (1837). Echinocactus maelenii Salm-Dyck, Cact. Hort. Dyck. 18 (1842). Mammillaria maelenii Salm-Dyck, Cact. Hort. Dyck. 14 (1845). Echinocactus maelenii Hemsley ('macleanii'), Biol. Centr. Amer. Bot. 1: 534 (1880). Cereus tuberosus Pfeiffer, Enum. Cact. 102 (1837). Echinocactus tuberosus Salm-Dyck ex Foerster, Handb. Cact. 287 (1846). Echinocactus leucacanthus var. tuberosus Foerster, Handb. Cact. 287 (1846). Echinocactus ehrenbergii Pfeiffer, Allg. Gartenz. 6: 275 (1838). Thelocactus ehrenbergii F. Knuth, in Backeb. & F. Knuth, Kaktus-ABC, 359 (1935). Echinocactus leucacanthus var. crassior Salm-Dyck, Cact. Hort. Dyck. 35 (1850). Echinocactus porrectus Lemaire, Cact. Aliq. Nov. 17 (1838). Thelocactus porrectus F. Knuth, in Backeb. & F. Knuth, Kaktus-ABC, 361 (1935). Thelocactus leucacanthus var. porrectus Backeb., Die Cactaceae V: 2818 (1961). Echinocactus subporrectus Lemaire, Cact. Aliq. Nov. 25 (1838). Echinocactus tuberosus var. subporrectus Foerster, Handb. Cact. 523 (1846). Echinocactus theloideus Salm-Dyck, Allg. Gartenz. 18: 396 (1850).
Description
Stem commonly clustering, globose or ovoidal, 9-15 cm tall, 5-7 cm wide. Ribs 8-13, distinct. Tubercles rounded. Areoles with glands. Central spines 1-3, 10-50 mm long, ochre to greyish, straight, acicular. Radial spines 8-18, 12-20 mm long, ochre to greyish, straight, acicular. Flowers 40-65 mm wide, yellow.
Distribution
Mexico, Hidalgo and Queretaro, occurring in matorral xerofilo on limestone hills.
Comments
It was the first species of the genus to be discovered and imported into Europe. The many names that appeared in the literature a few years after the first description are merely due to re-descriptions of the same taxon or apply to forms insufficiently distinct to deserve formal recognition.
Thelocactus leucacanthus
Mesa del León, Queretaro
Photo: A. Mosco
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Thelocactus leucacanthus
Mesa del León, Queretaro
Photo: A. Mosco
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Thelocactus leucacanthus
Mesa del León, Queretaro
Photo: A. Mosco
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Thelocactus leucacanthus
PAN 80B Peña Bernal, Queretaro
Photo: A. Mosco
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