Descurainia pinnata (Walter) Britt. ?
Annotated by Charles F. Williams, 28 May 2012. Sources: FPNW/USDA-NRCS Plants Database.

Idaho: Bannock County: Pocatello. Slate Mountain Trail, Caribou-Targhee National Forest. Ridge of Slate Mountain, from E-W. Start on hill above Caribou/Bighorn Rds. and follow ridge to saddle where Dry Creek/Gibson Jack trail crosses and joins Slate Mtn. bike trail. Elev. 5800-6200 ft.
42.7688° N, 112.4348° W; T7S R34E S25 SE 1/4
Datum: WGS84. Uncertainty: 1000 meters. Coordinate Source: GeoLocate. estimate
Dry, rocky ridge with few Junipers and woody shrubs. Many plants in bloom along ridge, including: Balsamorhiza sagittata (just finishing), Balsamorhiza hookeri (full bloom), Wyethia amplexicaulis (just starting), and Astragalus purshii (starting to fruit). Also in bloom - Castilleja chromosa, Penstemon humilus, Antennaria, Agoseris, and Eriogonum. Cant’ be certain of ID without fruits. Plant tall (40 cm), with 1x pinnately compound leaves. Lower leaves with wider, more deeply lobed leaflets; very densely stellate-pubescent. Upper leaves with narrower leaflets, less lobed, ~glabrous. Flowers yellow, tiny, opening widely, almost flat, stamens broadly spreading. Petals and sepals yellow Just beginning to bloom. Uncommon.

Charles F. Williams 603, May 28, 2012
IDS, Accession: 2012.011, Barcode: IDS0042463