Echinocereus bonkerae Thornber Bonker 1932


Echinocereus fendleri var. bonkerae (Thornber & Bonker) L. D. Benson 1944, £ fasciculatus var. bonkerae (Thornber & Bonker) L. D. Benson 1969, E. fasciculatus subsp. bonkerae (Thornber & Bonker) N. P. Taylor 1997

Plants occurring in loose clumps of 5-15 stems. Stems cylindrical to elongate, green, 12-20 cm (4.7-7.9 in) long, 4-7.5 cm (1.6-3 in) in diameter, with spines not obscuring the stems. Ribs 11-16, not distinctly tuberculate. Central spine one, erect, rigid, stout, white or pale gray, with dark tip, 6-7.5 mm (0.2-0.3 in) long. Radial spines 11-14, whitish or grayish, spreading, straight, 12-20 mm (0.5-0.8 in) long. Flowers borne on the upper half of the stems, broadly funnelform, magenta to reddish purple, 5-6.2 cm (2-2.4 in) long and in diameter. Fruits globose, green, becoming red, fleshy. Distribution: desert grassland of Arizona and, probably, adjacent Sonora, Mexico.

Echinocereus bonkerae

232 Echinoceres boyce-thompsonii

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