Echinocereus rigidissimus Engelmann F Haage 1897

arizona rainbow hedgehog cactus, sonoran rainbow cactus Cereus pectinatus var. rigidissimus Engelmann 1856 Echinocereus pectinatus var. rubispinus G. Frank & A. B. Lau 1982, E. rigidissimus var. rubispinus (G. Frank & A. B. Lau) N. P. Taylor 1984, E. rigidissimus subsp. rubispinus (G. Frank & A. B. Lau) N.P.Taylor 1997

Plants usually solitary, globose to cylindrical, 6-30 cm (2.412 in) long, 4-11 cm (1.6-4.3 in) in diameter, obscured by spines. Ribs 15-26, low, with flattened tubercles. Central spines absent. Radial spines 15-35, all flattened against the stems, pectinately arranged, often interlaced, stout, red, white, yellowish, to brownish, 5-10 mm (0.2-0.4 in) long. Flowers borne at the sides of the stems, funnelform, brilliant pinkish red to magenta, with white throats, 6-7 cm (2.4-2.8 in) long, 6-9 cm (2.4-3.5 in) in diameter. Fruits ovoid, green to red, fleshy, with heavy spination. Distribution: southwestern United States and northwestern Mexico.

Two subspecies of Echinocereus rigidissimus are recognized. Subspecies rigidissimus has stems to 11 cm (4.3 in) in diameter, and 15-23 radial spines; it occurs in Arizona, New Mexico, and neighboring Sonora, Mexico. Subspecies rubispinus has stems to only 6 cm (2.4 in) in diameter, but 30-35 radial spines; it occurs only in Chihuahua, Mexico.

Echinocereus Xroetteri (Engelmann) Rumpler 1886, as a species LLOYD'S HEDGEHOG CACTUS Echinocereus lloydii Britton & Rose 1922

Plants solitary or branching to form clumps of 20 or more stems. Stems cylindrical, green, 15-20 cm (5.9-7.9 in) high, 8.5-11 cm (3.3-4.3 in) in diameter. Ribs 11-13, forming tubercles. Central spines 2-6, reddish, straight, spreading, 1.21.9 cm (0.5-0.7 in) long. Radial spines 11-16, reddish gray, diverging, straight, to 1.5 cm (0.6 in) long. Flowers borne near the stems tips, broadly funnelform, typically orange but varying from red to pink or yellow, 5-6 cm (2-2.4 in) long, 4.5-7 cm (1.8-2.8 in) in diameter. Distribution: New Mexico, Texas, and adjacent Mexico. Echinocereus xroetteri (as E. lloydii) is listed as endangered in the U.S. Endangered Species Act. Powell et al. (1991) have shown that E. x roetteri is a naturally occurring hybrid, E. coccineus X E. dasyacanthus.

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