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Thelocactus bicolor ssp. flavidispinus (Backeberg) N.P. Taylor, CCI 5: 14 (1998).
Basionym: Thelocactus bicolor var. flavidispinus Backeb., Beitr. Sukk.-Kunde Pflege 1941: 6 (1941).
Lectotype: Beitr. Sukk.-Kunde Pflege 1941: 6 (1941).
Synonyms: Thelocactus bicolor var. flavidispinus Backeb., Beitr. Sukk.-Kunde Pflege 1941: 6 (1941). Thelocactus flavidispinus Backeb., Cact. Succ. J. (US) 23: 150 (1951). Echinocactus flavidispinus Weniger, Cacti S. W. 87 (1970) nom. nud. Ferocactus bicolor var. flavidispinus N.P. Taylor, Cact. Succ. J. Gr. Brit. 41: 30 (1979).
Description
Stem single, ovoidal, 1.5-4.5 cm tall, 2-7 cm wide. Ribs 13, distinct. Tubercles rounded. Areoles with glands. Central spines 3-4, 15-25 mm long, ochre to reddish, straight, acicular. Radial spines 12-20, 10-15 mm long, ochre to reddish, straight, acicular. Flowers 60-80 mm wide, magenta with a red throat.
Distribution
USA, Texas, Brewster Co. near Marathon, restricted to Caballos Novaculite soil.
Comments
This subspecies is noted for its straw-coloured spination; stem and flowers are smaller than the type.
Thelocactus bicolor ssp. flavidispinus
Brewster Co., Texas
Photo: J. Rabenda
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Thelocactus bicolor ssp. flavidispinus
SB 124 Brewster Co., Texas
Photo: A. Mosco
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