Physaria prostrata (A. Nelson) O'Kane & Al-Shehbaz
Annotated by Ben Legler, 2014.

Idaho: Custer County: Challis National Forest: knoll 0.45 km south of Stanley Creek and 1.7 km east of Highway 21, 6.5 air km northwest of Stanley. Elev. 1949 m.
44.258414° N, 114.986406° W
Datum: WGS 84. Uncertainty: 4 meters. Coordinate Source: GPS.
Small knoll between Pinus contorta forest and open sagebrush meadows; on northwest side of knoll with steep slope of mostly bare, loose sandy soil and pea gravel, sparsely vegetated with Eriogonum, Sedum lanceolatum, Artemisia, Phlox. Plants small, forming tight rosettes from a slender taproot; leaf blades inrolled; fruiting stems spreading and prostrate; fruits 2-3 mm, ovate, the valves varying from inflated and rounded to weakly obcompressed and slightly keeled, only slightly flattened near tip; plants locally common in bare soil on steeper slopes of knoll. Photographed. Phenology: Fruits.

Ben Legler 13128, Jul 26, 2014
WTU