Rollins, J. Arnold Arbor. 64: 495, fig. 1. 1983.
caudex branched, (thick, covered with persistent, overlapping leaf bases); densely (silvery) pubescent, trichomes (stellate-scalelike), several-rayed, rays fused (webbed) to tips.
several from base, erect to decumbent, (unbranched, fertile stems from among basal leaves), 1.2-1.8 dm.
(erect, not rosulate); blade broadly oblanceolate, 4-8 cm, margins entire or shallowly sinuate-dentate, (apex acute).
(proximal petiolate); blade narrowly lanceolate, similar to basal in size, (distal with cuneate base), margins entire.
loose, (elongated in fruit).
(widely spreading to recurved), 1-1.5 cm.
sepals (greenish yellow), elliptic, often broadly so, 4.8-7.1 mm; petals oblanceolate, 6.8-9.8 mm.
(usually pendent), slightly didymous apically, obcordate, slightly inflated, 4-7 × 3-6 mm, (papery, basal sinus absent, apical sinus evident to nearly absent); valves (retaining seeds after dehiscence), pubescent; replum broadly obovate to suborbicular, 4-5 mm, as wide as or wider than fruit, margins entire; ovules usually 4 (rarely 6-8) per ovary; style (2.5-)3-4(-5) mm.
Flowering May-Jun. Steep slopes, fine chiprock, shaley hillsides; of conservation concern; 1800-2300 m; Colo.
is known from the Thirteenmile Creek Tongue and the Parachute Creek Member of the Green River Formation. It is in the Center for Plant Conservation's National Collection of Endangered Plants.