Mountain Cactus
Scientific Name: Pediocactus simpsonii Britton & Rose
Synonym: Echinocactus simpsoni, Mammillaria simpsoni, Pediocactus nigrispinus ssp. beastonii , Pediocactus nigrispinus var. beastonii , Pediocactus nigrispinus ssp. puebloensis , Pediocactus nigrispinus, Pediocactus simpsonii ssp. idahoensis , Pediocactus simpsonii ssp. indranus , Pediocactus simpsonii var. indranus , Pediocactus simpsonii var. nigrispinus
Family: Cactaceae
USDA: 4-7
Heat Tolerance: Comes from high elevation location, does not like excessive summer heat, particularly humid heat
Origin: USA (Montana to northern Arizona), at 6000 to 10000 feet elevation (1800-3000 m)
Growth Habits: Solitary, light green stem, 1 to 6 inches tall (2.5-15 cm), 5 inches in diameter (12.5 cm), flattens in winter; spirally arranged tubercles, 0.25 to 0.6 inches long (6-15 mm); young areoles woolly; 5 to 11 pale yellow central spines on mature plants, 0.4 to 0.8 inch long (1-2 cm); 15 to 35 whitish radials, 0.25 to 0.5 inch long (6-12 mm)
Blooming Habits:
Bell-shaped flowers, pale pink or pale yellow, at the apex of the plant, 0.6 to 1 inch long and wide (15-25 mm). The fruits are spherical, green with an occasional reddish tinge, splitting open when ripe.
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