Arabis whitedii Piper, Bull. Torrey Bot. Club 28: 39. 1901; Halimolobos whitedii (Piper) Rollins

Perennials; densely and uni-formly pubescent, trichomes shortly stalked, minute, Y-shaped or cruciform, mixed with simple or 1 or more ray-forked ones. Stems simple or few from caudex, erect, branched (several) distally, (1.5-)2.5-5.5(-6.5) dm, densely pubescent throughout. Basal leaves often rosulate; petiole (1-)2-5(-7) cm; blade spatulate to linear-oblanceolate, (1-)1.7-5 cm × (3-)4-9(-12) mm, margins entire or dentate, surfaces densely pubescent. Cauline leaves 3-7 (widely spaced); blade linear-oblanceolate, 2-7 cm × 1-5(-8) mm, margins usually entire, rarely minutely sparsely denticulate, apex obtuse, surfaces densely pubescent. Fruiting pedicels (5-) 8-14(-17) mm, densely pubescent. Flowers: sepals 2.5-3 × 1-1.5 mm; petals (4-)5-6.5(-7.5) × (1.2-)1.5-2 (-2.2) mm; filaments 1.5-3 mm; anthers oblong, 0.6-0.8 mm. Fruits suberect, (not appressed to rachis), straight, slightly torulose, subterete, (1-)1.3-1.8(-2) cm × 0.8-1 mm; valves each with obscure midvein on proximal 1/2, densely pubescent; ovules 20-30 per ovary; style 0.2-0.4 mm. Seeds 1-1.2 × 0.6-0.7 mm.

Flowering Apr-Jul. Dry sagebrush scabland, gravelly hillsides, basaltic talus, dry sandy slopes, alpine meadows, cliffs, ridge crests; 500-1200 m; B.C.; Wash.

In Washington state, Sandbergia whitedii appears to be restricted to Chelan, Douglas, Grant, Kittitas, Lincoln, and Okanogan counties.