KNOWLTON'S CACTUS, KNOWLTON'S PINCUSHION CACTUS, THIMBLE PLAINS CACTUS
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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