Arabis lyrata Linnaeus var. kamchatica Fischer ex de Candolle, Syst. Nat. 2: 231. 1821; A. kamchatica (Fischer ex de Candolle) Ledebour; A. kawasakiana Makino; A. lyrata subsp. kamchatica (Fischer ex de Candolle) Hultén; A. morrisonensis Hayata; Cardaminopsis kamchatica (Fischer ex de Candolle) O. E. Schulz.

Herbs biennial or perennial with a caudex, (5-)10-30(-45) cm tall. Stems erect or decumbent, 1 to many from base, usually branched above, basally with simple and 1-forked trichomes, apically glabrous. Basal leaves with a petiole 0.5-2(-6) cm; leaf blade oblanceolate or ovate, (0.5-)1-3(-8) × (0.3-)0.5-1.5 cm, adaxially with a mixture of simple and stalked, 1-forked trichomes, rarely glabrous, margin dentate or lyrate, with 1-3 lateral lobes on each side, apex obtuse. Cauline leaves shortly petiolate, several; blade of middle ones oblanceolate, (0.5-)1-3(-4) cm × (1-)2-7 mm, entire, repand, or obscurely toothed, rarely lobed, gradually reduced in size upward. Fruiting pedicels slender, divaricate, straight, (0.5-)0.8-1.2 cm. Sepals 2-3 mm, glabrous or densely pubescent, lateral pair saccate. Petals white, spatulate or obovate, 4-5(-6) × 1.5-2(-2.5) mm; claw to 1 mm. Filaments white, 2-3 mm. Siliques linear, flattened, torulose, (1.5-)2-3.5(-4.5) cm × 0.5-0.8 mm; valves with a distinct midvein extending full length; style to 0.5 mm. Seeds oblong, flattened, light brown, 0.9-1.2 mm; cotyledons accumbent. Fl. Mar-Jul, fr. Jun-Oct. 2n = 16, 32.

Arabidopsis lyrata subsp. lyrata is restricted to North America.

Gravelly slopes, forests, alpine regions, roadsides; 1700-3400 m. Jilin, Taiwan [Japan, Korea, Russia (Far East, E Siberia); NW North America].