Echinocereus chisoensis W X Marshall 1940

CHIS0S HEDGEHOG CACTUS, CHIS0S MOUNTAIN HEDGEHOG CACTUS Echinocereus fobeanus Oehme 1940, E. chisoensis var.fobeanus

(Oehme)N.P, Taylor 1985 Echinocereus metornii G. Frank 1990, E. fobeanus subsp. metornii (G. Frank) Blum & Lange 1998

Plants solitary or branched. Stems cylindrical, tapering toward the tips, gray-green to blue-green, 5-25 cm (2—9.8 in) high, 3-5 cm (1.2-2 in) in diameter, spines not obscuring the stems. Roots sometimes thickened. Ribs 10-16, somewhat spiraled, strongly tuberculate, bearing distinctly woolly areoles. Central spines 1-6, very slender, brownish, to 1.7 cm (0.7 in) long, lowermost one longest and erect, others ascending and diverging. Radial spines 11-16, whitish to grayish, tending to diverge, uppermost ones tiny, lowermost longest, to 1.2-2 cm (0.5-0.8 in). Flowers borne near the stem tips and below, funnelform, light pinkish magenta with white throats, 6-9.5 cm (2.4-3.7 in) long, 5-12 cm (2-4.7 in) in diameter. Fruits club shaped, to 3.5 cm (1.4 in) long, reddish, woolly, bristly, splitting open. Distribution: west Texas, south into Coahuila and Durango, Mexico.

Two varieties of Echinocereus chisoensis are recognized. Variety chisoensis tends to have stems that are not annually constricted, and flowers 6 cm (2.4 in) long with the bases of the inner perianth parts deep red; it occurs at elevations below 1000 m (3300 ft) in the Big Bend region of Texas and is listed as threatened in the U.S. Endangered Species Act. Variety fobeanus has stems that are often constricted into an-

nual sections, and flowers maybe as long as 9.5 cm (3.7 in) with the bases of the inner perianth parts pale green or light brown; it occurs at elevations above 1000 m (3300 ft) in Coahuila and Durango.

Echinocereus cinerascens (A. P. de Candolle) Lemaire 1868 Cereus cinerascens A. P. de Candolle 1828 Cereus ehrenbergii Pfeiffer 1840, Echinocereus ehrenbergii (Pfeiffer) Riimpler 1885, £ pentalophus var. ehrenbergii (Pfeiffer) Bravo 1974, E. cinerascens subsp. ehrenbergii (Pfeiffer) Blum & Rutow 1998 Echinocactus chlorophthalmus W. J. Hooker 1848, E. chlorophthalmus

(W. J. Hooker) Britton & Rose 1913 Echinocereus glycimorphus Riimpler 1886 Echinocereus tuiensis Bravo 1973, E. cinerascens var. tulensis (Bravo) N. P. Taylor 1988, E. cinerascens subsp. tulensis (Bravo) N. P. Taylor 1997

Echinocereus cinerascens var. septentrionalis N. P. Taylor 1988, E. cinerascens subsp. septentrionalis (N. P. Taylor) N. P. Taylor 1997

Plants many-stemmed, usually forming mounds of prostrate to erect stems. Stems cylindrical, bright green, to 30 cm (12 in) long, 1.5-12 cm (0.6-4.7 in) in diameter. Ribs 5-12, usually with well-developed tubercles, other times nearly smooth. Central spines 1-6, erect to divergent, sometimes forming a cross, pinkish or orange, becoming brown or even white, to 4.5 cm (1.8 in) long. Radial spines 6-10, round, yellowish to whitish, 1-3.5 cm (0.4-1.4 in) long. Flowers usually arising well below the stem tips, broadly funnelform, pinkish magenta with white or very pale throats, 7-10 cm (2.8-3.9 in) long, 6-12 cm (2.4-4.7 in) in diameter. Fruits spiny, green, with a strawberry taste. Distribution: central Mexico in the Federal District and México, Hidalgo, Querétaro, Guanajuato, Zacatecas, and San Luis Potosí.

Three subspecies of Echinocereus cinerascens are recognized. Subspecies cinerascens has stems 4-12 cm (1.6-4.7 in) in diameter with 6-12 ribs; it occurs above 2000 m (6600 ft) throughout the range of the species. Subspecies septentrionalis has stems about 6 cm (2.4 in) in diameter with 6-8 ribs; it occurs in the plateau region of northern central Mexico in San Luis Potosí and adjacent Zacatecas above 1200 m (3900 ft). Variety tulensis has stems 4-6 cm (1.6-2.4 in) in diameter with 4-7 ribs; it occurs in southwestern Tamaulipas and adjacent San Luis Potosí below 1200 m (3900 ft).

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