Perennial. Stems erect, densely puberulent but becoming glabrous with age, to 50 cm tall, branching above. Lvs hairy; marginal hairs coarser than surface hairs but triangular or 2-lobed denticles 0. Basal and lower stem lvs falling before fruiting, linear-lanceolate, pinnatisect to serrate, 10-40 × 1-2.5 mm. Upper stem lvs linear-oblong, entire or 3-fid at apex, abruptly narrowed or auriculate at base, 8-12-(20) × 0.8-1.5-(2) mm. Racemes 4-8-(12) cm long; rachis densely puberulent; pedicels densely puberulent, erecto-patent, (2.5)-3-4 mm long at fruiting. Sepals hairy, green or purple, 0.5-0.8 × 0.2-0.3 mm. Petals white, minute. Stamens 2. Silicles narrow-ovate to rhomboid, 2.7-3 × 1.8-2-(2.2) mm; stigma almost sessile, included in shallow notch; valves usually purple, glabrous or sometimes hairy when young. Seed oblong, brown, not winged, c. 1.4 mm long.