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Thelocactus bicolor ssp. heterochromus (Weber) Mosco & Zanovello, Bradleya 18: 62 (2000).
Basionym: Echinocactus heterochromus F.A.C. Weber, Dict. Hort. Bois. 466 (1896).
Lectotype: 3.5 km al Oeste de la Soledad, Durango, R.D. Worthington 10902 (TEX).
Synonyms: Thelocactus heterochromus (F.A.C. Weber) van Oosten, Kakteenkunde 58 (1940). Ferocactus heterochromus N.P. Taylor, Cact. Succ. J. Gr. Brit. 41: 90 (1979). Echinocactus bicolor var. pottsii Salm-Dyck, Cact. Hort. Dyck. 173 (1850).
Description
Stem single, depressed to globose, 4-7 cm tall, 6-15 cm wide. Ribs 8, distinct. Tubercles rounded. Areoles without glands. Central spines 1-4, 20-50 mm long, ochre to reddish, straight, subulate. Radial spines 6-10, 16-40 mm long, ochre to reddish, straight, acicular to subulate. Flowers 45-80 mm wide, magenta with a red throat.
Distribution
Mexico, Coahuila and Durango, occurring in matorral xerofilo on limestone hills.
Comments
This is the westernmost taxon in the genus. Usually, it has a depressed to globose stem with wider ribs. Spines are stouter, subulate, banded in red. The var. pottsii applies to those entities from Chihuahua that are intermediate between heterochromus and bicolor, but definitely belong to heterochromus for their lack of areolar glands.
Thelocactus bicolor ssp. heterochromus
Nazas, Durango
Photo: A. Mosco
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Thelocactus bicolor ssp. heterochromus
Nazas, Durango
Photo: A. Mosco
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Thelocactus bicolor ssp. heterochromus
Hidalgo del Parral, Chihuahua
Photo: A. Lausser
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Thelocactus bicolor ssp. heterochromus
Hidalgo del Parral, Chihuahua
Photo: A. Lausser
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