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Thelocactus conothelos ssp. argenteus (Glass & Foster) Glass, Ident. Guide Threatened Cacti of Mexico 1: TH/CON (1997).
Basionym: Thelocactus conothelos var. argenteus Glass & Foster, Cact. Succ. J. (US) 44: 48 (1972).
Type: About 7 miles west of Ascension, 12 February 1971, Glass & Foster 3176 (ZSS).
Synonyms: Torreycactus conothele var. argenteus (Glass & Foster) Doweld, Sukkulenty 1: 19 (1998). Torreycactus conothelos ssp. argenteus (Glass & Foster) Doweld, Sukkulenty 3: 37 (2000).
Description
Stem single, globose to elongate, 8-18 cm tall, 13 cm wide. Ribs indistinct. Tubercles conical. Areoles with glands. Central spines 4-6, 30-50 mm long, silvery to greyish, straight, acicular. Radial spines 20-25, 13-30 mm long, silvery to greyish, straight, acicular. Flowers 50-55 mm wide, magenta.
Distribution
Mexico, Nuevo León, Valley of Ascension, occurring in matorral xerofilo and pine forest on limestone hills.
Comments
This species distinguishes from the type for its dense white to silvery spination and the shredding central spines. The magenta flowers appear at the end of winter, from February to March, when higher temperatures and sunny days are needed by the plants to bloom.
Thelocactus conothelos ssp. argenteus
Sandia, Nuevo León
Photo: A. Mosco
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Thelocactus conothelos ssp. argenteus
Sandia, Nuevo León
Photo: A. Mosco
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Thelocactus conothelos ssp. argenteus
Sandia, Nuevo León
Photo: A. Mosco
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Thelocactus conothelos ssp. argenteus
SB 311 La Ascensión, Nuevo León
Photo: A. Mosco
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