State Rank Reason (see State Rank above)
Though rare to uncommon in Montana, where it is known from scattered locations within arid habitats in the southwest portion of the state, its long-term viability does not appear to be at risk. Additional data on population levels and trends should be collected to corroborate its status.
Stems unsegmented, solitary or clumped, 7–12 cm high, buried in the soil, globose with spirally arranged tubercles. Spines 20 to 40 per areole; the central 3 to 10, straight, yellow to reddish, 6–12 mm long; marginal spines smaller, whitish. Flowers 10–15 mm long, borne near tip of tubercles; tepals yellow-green to magenta, the outer with greenish midstripe. Fruits narrow-globose, 6–8 mm long, green-tinged with red. Our plants are var. simpsonii (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX
Our plants are variety simpsonii