6. Eutrema edwardsii R. Brown, Chlor. Melvill.: 9. 1823; Sisymbrium edwardsii (R. Brown) Trautvetter, Trudy Imp. S.-Peterburgsk. Bot. Sada 1: 59. 1871. TYPE: Canada, Melville Island, Edwardss.n. (holotype, BM!).

Draba laevigata Chamisso & Schlechtendal, Linnaea 1: 25. 1826.

Eutrema intermedium Turczaninow, Bull. Soc. Imp. Naturalistes Moscou 15: 283. 1842; E. edwardsii R. Brown var. intermedium (Turczaninow) A. L. Ebel, Turczaninowia 3(3): 30. 2000.

Eutrema labradoricum Turczaninow, Bull. Soc. Imp. Naturalistes Moscou 27: 305. 1854. TYPE: xx.

Eutrema penlandii Rollins, Contr. Gray Herb. 171: 51. 1950; Eutrema edwardsii subsp. penlandii (Rollins) W. A. Weber, Phytologia 58: 383. 1985. TYPE: United States, Colorado, Park Co., Hoosier Pass, 12,300 ft, 27 Jul 1935, C.W. T. Penland 1305 (holotype, GH!).

     Herbs, perennial, glabrous throughout, with simple or few-branched caudex and fleshy roots. Stems (3–)8–30(–45) cm, erect, simple, 1 to several from caudex. Basal leaves rosulate, somewhat fleshy, soon withering; petiole 1–4.5(–6) cm; leaf blade ovate, lanceolate, or oblong, (0.3–)0.8–2(–2.5) cm x (1–)4–14(–18) mm, base truncate, obtuse, or cuneate, sometimes oblique, margin entire, apex obtuse; cauline leaves 3–7(–10), lowermost petiolate, upper ones sessile, ovate, lanceolate, oblong, or linear, (0.7–)1–3(–4) cm x (1–)3–10(–14) mm, base cuneate, margin entire, apex subacute.Racemes corymbose, elongated considerably in fruit, 3–15 cm; fruiting pedicels divaricate to ascending, curved upward or sometimes straight, (1.5–)3–10(–15) mm. Sepals ovate, 1.5–3 x 1–1.5 mm, caducous, margin membranous; petals white, spatulate, 3–5 x 1.5–3 mm; filaments 2–2.5 mm, slightly dilated at base; anthers ovate, 0.2–0.4 mm; ovules (6–)8–12(–14) per ovary. Fruit linear to narrowly oblong, (0.7–)1–2(–2.5) cm x 2–3 mm, slightly 4-angled, not torulose; valves cuneate at both ends, with a prominent midvein; gynophore 0.2–1 mm, rarely obsolete; septum mostly perforate; style 0.2–1 mm. Seeds oblong or rarely ovate, plump, (1.5–)2–3 x (0.7–)1–1.5 mm. 2n = 18, 28, 42, 56.

Flowering: Jun–Aug.

Habitat: talus slopes, tundra, glaciated hills, grassy margin of streams, wet areas of peat ridges.

Elevation: 0–3900 m.

Distribution: Canada (British Columbia, Northwest Territories, Nunavut, Quebec,Yukon), Greenland, Mongolia, Russia (Far East, Siberia), United States (Alaska, Colorado).