Echinocereus dasyacanthus Engelmann 1848

golden rainbow hedgehog cactus, texas rainbow cactus, texas rainbow hedgehog, yellow-flowered pitaya Cereus dasyacanthus (Engelmann) Engelmann 1859 Cereus ctenoides Engelmann 1859, Echinocereus ctenoides (Engelmann) Riimpler 1886, E. pectinatus subsp. ctenoides (Engelmann) G.Frank 1991 Echinocereus hildmannii Arendt 1892 Echinocereus steereae Clover 1938

Echinocereus dasyacanthus var. rectlspinus Trocha & Fethke 1991, E. dasyacanthus subsp. rectlspinus (Trocha & Fethke) Blum et al. 1998

Plants usually solitary. Stems mostly cylindrical and tapering toward the tips, to 35 cm (14 in) high and 13 cm (5.1 in) in diameter, covered with spines. Ribs 12-21, making low tubercles. Spines yellow to pinkish to dark brown, often indistinguishable as radials or centrals. Central spines 2-5 or many, erect or diverging, 2-25 mm (to 1 in) long. Radial spines 12-25, interlaced with those of adjoining areoles, diverging, 5-15 mm (0.2-0.6 in) long. Flowers often arising from the sides of the stems, most commonly yellow but at times whitish, orange, pink, or purple, 5-15 cm (2-5.9 in) in diameter. Fruits usually globose, fleshy, green to purple, with deciduous spines. Distribution: Arizona, New Mexico, and west Texas, and adjacent Sonora, Chihuahua, and Coahuila, Mexico. Echinocereus dasyacanthus has often been included in E. pectinatus, to which it is closely related.

Echinocereus engelmannii (Parry ex Engelmann) Lemaire 1868

calico cactus, dagger-spine hedgehog, engelmann's hedgehog, howe hedgehog,indian strawberry cactus, munz's hedgehog cactus, needle-spine hedgehog, purple-spined hedgehog cactus, strawberry hedgehog, varied-spine hedgehog Cereus engelmannii Parry ex Engelmann 1852 Cereus engelmannii var. chrysocentrus Engelmann & Bigelow 1856, Echinocereus engelmannii var. chrysocentrus (Engelmann & Bigelow) Riimpler 1885 Cereus engelmannii var. varlegatus Engelmann & Bigelow 1856, Echinocereus engelmannii var. variegatus (Engelmann & Bigelow) Riimpler 1885

Cereus munzii Parish 1926, Echinocereus munzii (Parish) L. D. Benson 1941, E. engelmannii var. munzii (Parish) P. Pierce & Fosberg 1933 Echinocereus engelmannii var. acicularis L. D. Benson 1969 Echinocereus engelmannii var. armatus L. D. Benson 1969 Echinocereus engelmannii var. purpureus L. D. Benson 1969 Echinocereus engelmannii var. howei L. D. Benson 1974

Plants with 3-60 stems arising near the base, forming open or compact clumps to nearly 1 m (3.3 ft) wide. Stems cylindrical, green, mostly erect, 5-60 cm (2-24 in) high, 3.8-8.7 cm (1.5-3.4 in) in diameter, obscured by heavy spination.

Ribs 10-13, not clearly tuberculate. Spines extremely variable in color and size. Central spines 2-7, angular, stout to flexible, straight to twisted, usually diverging, to 7 cm (2.8 in) long. Radial spines 6-14, pressed closely to the surface, to 2 cm (0.8 in) long. Flowers borne on the upper half of the stem, short funnelform, purplish red to magenta to lavender. Stigmas deep green, to 9 cm (3.5 in) long and in diameter. Fruits red, juicy, edible, to 3 cm (1.2 in) long, with deciduous areoles. Distribution: occurring widely in the southwestern United States and northwestern Mexico, including Baja California, from sea level to 2400 m (7900 ft).

Fruits of Echinocereus engelmannii are eaten (Chapter 2, under Cacti as Food). Benson (1982) recognized nine varieties of E. engelmannii, as did Taylor (1985). Variety nicholii is now recognized as a separate species, E. nicholii. Taylor (1993) later commented, however, that the other varieties may not be worthy of formal taxonomic recognition: engelmannii, California, Nevada, and Arizona, and Baja California and Sonora, Mexico; acicularis, California, Arizona, Baja California, and Sonora; armatus, California and Nevada; chryso-centrus, California, Nevada, Arizona, and Utah; howei, California and Nevada; munzii, California and Baja California; purpureus, Utah; and variegatus, Arizona and Utah.

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