Draba novolympica Payson & H. St. John, Proc. Bio. Soc. Wash. 43: 113. 1930. TYPE: U.S.A. Washington, Olympic Mts, rocky summits, shale, etc., 6000 ft, 28 Aug 1898, J. B. Flett 844 (holotype, WS!).

Draba barbata Pohle var. treleasii O. E. Schulz in Engler, Pflanzenreich IV. 105(Heft 89): 102. 1927; D. paysonii J. F. Macbride var. treleasii (O. E. Schulz) C. L. Hitchcock, Univ. Wash. Publ. Biol. 11: 65. 1941. TYPE: U.S.A. California, Plaxer Co., summit of range between Devil’s Cliff and Tinkers Knob, 10 Aug 1901, P. B. Kennedy & S. B. Doten 271 (lectotype, designated by Mulligan (1971), B!; isolectotypes, NY!, RM!, UC!).

     Herbs perennial, cespitose, scapose, densely pulvinate; caudex branches many, creeping, covered with persistent leaves of previous seasons, some branches terminated in sterile rosettes. Stems 0.5–3.5 cm, often many from caudex, unbranched, densely pubescent throughout with a mixture of simple trichomes 0.4–0.8 mm and stalked, 2–5-rayed trichomes 0.1–0.5 mm. Basal leaves rosulate, densely imbricate, sessile, oblong to linear-oblanceolate, 2–8 × 0.5–1.5 mm, entire; abaxial surface densely pubescent with stalked, 2–12-rayed stellate trichomes 0.1–0.6 mm; adaxial surface with simple and fewer 2-rayed trichomes 0.3–0.8 mm; margin ciliate with simple and spurred trichomes 0.3–1.2 mm; cauline leaves of flowering stems absent. Racemes ebracteate, 2–12-flowered, slightly elongated in fruit; rachis pubescent as stem, not flexuous; lowermost fruiting pedicels 1–5 mm, divaricate-ascending, straight, pubescent with a mixture of simple trichomes 0.3–0.9 mm and stalked, 2–5-rayed trichomes 0.1–0.5 mm. Flowers: sepals oblong, 1.5–2.5 mm, pubescent with simple and short-stalked, 2–4-rayed trichomes; petals bright yellow, oblanceolate to spatulate, 2–3.5(–4) × 1.5–2 mm; anthers oblong, 0.5–0.6 mm. Fruits often ovoid, (2.5–)3–4(–5) × 1.5–3.5 mm, somewhat inflated at base, symmetric, not twisted, densely pubescent with 2–6-rayed trichomes 0.05–0.4 mm, these occasionally mixed with much fewer, simple trichomes; style 0.2–0.6(–0.8) mm; ovules and seeds 4–8(–12) per fruit. Seeds oblong, flattened, 1.2–1.8 × 0.8–1.1 mm, wingless. 2n = 42.

Flowering: Jun–Aug.

Habitat: alpine crests, open knolls, fell-fields, talus, weathered shale, calcareous shale scree, rocky grounds and cliffs, subalpine conifer forests.

Elevation: 1500–3700 m.

Distribution: Canada (Alberta, British Columbia), United States (California, Idaho, Montana, Nevada, Oregon, Utah, Washington, Wyoming).