Pediocactus knowltotlii L D Benson 1960


Pediocactus simpsonii var. knowitonii (I. D. Benson) Halda 1998

Plants solitary or clustered. Stems globose, usually level or only 2.5 cm (1 in) above the ground, 0.7-5.5 cm (0.3-2.2 in) high, 1-3 cm (0.4-1.2 in) in diameter. Spines dense but not obscuring the stems. Central spines absent. Radial spines 18-26, spreading, recurved, reddish tan, pink or white, 1-1.5 mm long, with white hairs. Flowers pink, 10-35 mm (0.4-1.4 in) long, 10-25 mm (0.4-1 in) in diameter. Fruits 3 mm in diameter. Distribution: near the Los Piños River in New Mexico. Pediocactus knowitonii is listed as endangered in the U.S. Endangered Species Act and is included in Appendix I of cites. Only one small site is known; the plant is very rare.

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