Arabis glabra (Linnaeus) Bernhardi; A. glabra var. furcatipilis M. Hopkins; A. macrocarpa (Nuttall) Torrey; A. perfoliata Lamarck; A. pseudoturritis Boissier & Heldreich; Turritis glabra var. lilacina O. E. Schulz; T. macrocarpa Nuttall; T. pseudoturritis (Boissier & Heldreich) Velenovsky

Plants (3-)4-12(-15) dm, sparsely to densely pilose basally, glabrous distally, trichomes simple and short-stalked, forked. Basal leaves: blades spatulate, oblanceolate, or oblong, (4-)5-12(-15) cm × 10-30 mm, apex obtuse, surfaces usually pubescent, rarely glabrous. Cauline leaves: blade lanceolate, oblong-elliptic, or ovate, 2-9(-12) cm × (5-)10-25(-40) mm, apex acute. Fruiting pedicels appressed to rachis, (6-)7-16(-20) mm, glabrous. Flowers: sepals (2.5-)3-5 × 0.5-1.2 mm, glabrous; petals 5-8.5 × 1.3-1.7 mm; filaments slender, median pairs 3.5-6.5 mm, lateral pair 2.5-4.5 mm; anthers 0.7-1.5 mm. Fruits (3-)4-10(-12.5) cm × 0.7-1.5 mm; style 0.5-0.8(-1) mm. Seeds 0.6-1.2 × 0.5-0.9 mm. 2n = 12, 16, 32.

Flowering Apr-Jul. Forest margins, fields, roadsides, stream banks, disturbed sites, mountain slopes, woods, meadows; 0-2800 m; Alta., B.C., Man., N.B., N.W.T., Ont., Que., Sask., Yukon; Alaska, Ariz., Calif., Colo., Conn., Idaho, Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.Mex., N.Y., N.C., Ohio, Oreg., Pa., S.Dak., Tenn., Utah, Vt., Va., Wash., W.Va., Wis., Wyo.; Europe; sw Asia; n Africa; introduced in Australia.