Thelocactus hexaedrophorus Lemaire Britton Rose 1922

Echinocactus hexaedrophorus Lemaire 1839 Echinocactus fossulatus Scheidweiler 1841, E. hexaedrophorus var. fossulatus (Scheidweiler) Salm-DyckexLabouret 1853, Thelocactus fossulatus (Scheidweiler) Britton & Rose 1923 Thelocactus hexaedrophorus [var.] majorQuehl 1894, T. hexaedrophorus var. major(Quehl) A. Berger 1929 Echinocactus droegeanus Hildmann ex K. Schumann 1898, Thelocactus hexaedrophorus var. droegeanus (Hildmann ex K. Schumann) A. Berger 1929

Echinocactus labouretianus K. Schumann 1898, Thelocactus hexaedrophorus var. labouretianus (K. Schumann) A. Berger 1929 Thelocactus lloydii Britton & Rose 1923, T. hexaedrophorus var. Iloydii

(Britton & Rose) Kladiwa & Fittkau 1975, T. hexaedrophorus subsp. lloydii (Britton & Rose) N. P. Taylor 1998 Thelocactus hexaedrophorus var. decipiens A. Berger 1929

Plants usually solitary, globose to flattened globose to sometimes depressed globose, green to deep olive green, 3-7.5 cm (1.2-3 in) high, 8-15 cm (3.1-5.9 in) in diameter. Ribs indistinct. Tubercles sometimes compressed apically, rounded, 8-20 mm (0.3-0.8 in) long, 13-26 mm (0.5-1 in) wide, 8-12 mm (0.3-0.5 in) high. Areoles elliptical, 4-13 mm (to 0.5 in) long, 12-28 mm (0.5-1.1 in) apart, on top of the tubercles and with distinct grooves, without extrafloral nectaries. Spines often difficult to distinguish as centrals and radials. Central spines 0-3, reddish to brownish to whitish, erect, straight, 15-25 mm (0.6-1 in) long. Radial spines 4-8, reddish white to brownish to grayish white, erect to spreading, straight, 5-35 mm (0.2-1.4 in) long. Flowers white with magenta midveins, 2.7-3.5 cm (1.1-1.4 in) long, 3.3-5.5 cm (1.3-2.2 in) in diameter; pericarpels covered with scales. Fruits green-magenta, becoming dry at maturity, 7-11 mm (0.3-0.4 in) long, 8-12 mm (0.3-0.5 in) in diameter, de-

Thelocactus hastifer

660 Thelocactus hexaedrophorus hiscing by basal pores, with scales, ovoid. Seeds 1.5-2 mm long, 1.2-1.5 mm in diameter, with testa divided into polygonal or square areas. Distribution: Chihuahuan Desert, savanna, and grasslands in San Luis Potosí, Zacatecas, Tamauli-pas, and Nuevo León, Mexico, at elevations of 1100-2300 m (3600-7500 ft).

Two subspecies of Thelocactus hexaedrophorus are recognized. Subspecies hexaedrophorus has rounded or hemispheric tubercles, 0-1 reddish central spine, 4-6 reddish to grayish white radials, and flowers 4-5.5 cm (1.6-2.2 in) in diameter; it occurs widely, mostly in the Chihuahuan Desert of San Luis Potosí, Tamaulipas, and Nuevo León, at elevations of 1100-2000 m (3600-6600 ft). Subspecies lloydii has delta-shaped tubercles, 1-3 reddish white to brownish central spines, 6-8 reddish white to brownish radials, and flowers 3.3-3.6 cm (1.3-1.4 in) in diameter; it is much more restricted, occurring only at higher elevations, 2200-2300 m (7200-7500 ft), in savanna and grassland in Zacatecas.

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