The World Flora Online

Apparently not a weed.

Perennial herb, up to 0.9 m high. Stems erect, several annually from rootstock; finely retrorsely puberulous in lower half, glabrous above. Leaves with basal ones dying off soon, petiolate; blade obovate, sublyrate or sinuately lobed; stem leaves sessile, ovate-oblong, up to 100 mm long, amplexicaul, base sagittate, apex acute, margins sinuate, dentate, the lower ones thinly puberulous on lower surface, upper ones glabrous. Flowers: in a dense, ebracteate, corymbose panicle; sepals 1.5-2.0 long; petals obovate, 3-4 mm long, white; Nov.-Feb. Fruit with pedicels ± reflexed or horizontally spreading; siliquae obcordate, 3.0-4.5 mm long, inflated. Erect herbs with annual shoots from a perennial root, 15-60(-90) cm high, finely retrorsely puberulous in the lower half, glabrous above. Basal leaves dying off soon, petiolate, ± obovate, sublyrate or sinuately lobed, sometimes ± canescent. Stem leaves up to 10 cm long, ovate-oblong, sessile, sagittate, amplexicaul, acute, sinuate-dentate, the lower ones thinly puberulous on the lower surface, the upper ones glabrous. Inflorescence dense. Sepals 1.5-2 mm long. Petals 3-4 mm long, obovate, clawed, white. Siliculae on c. 1 cm long, ± reflexed or horizontally spreading pedicels, 3-4.5 mm long, 3.5-5 mm broad, obcordate, inflated, indehiscent, the valves faintly reticulate; style 1-1.5 mm long, slender; stigma capitate. Seeds 2-2.25 x 1.2-1.5 mm, subcompressed, almost smooth, immarginate. Erect herbs with annual shoots from a perennial root, 15-60(-90) cm high, finely retrorsely puberulous in the lower half, glabrous above. Basal leaves dying off soon, petiolate, ± obovate, sublyrate or sinuately lobed, sometimes ± canescent. Stem leaves up to 10 cm long, ovate-oblong, sessile, sagittate, amplexicaul, acute, sinuate-dentate, the lower ones thinly puberulous on the lower surface, the upper ones glabrous. Inflorescence dense. Sepals 1.5-2 mm long. Petals 3-4 mm long, obovate, clawed, white. Siliculae on c. 1 cm long, ± reflexed or horizontally spreading pedicels, 3-4.5 mm long, 3.5-5 mm broad, obcordate, inflated, indehiscent, the valves faintly reticulate; style 1-1.5 mm long, slender; stigma capitate. Seeds 2-2.25 x 1.2-1.5 mm, subcompressed, almost smooth, immarginate.

Dry Grassland.

Native to Europe.

Perennials; (rhizomatous); hirsute or glabrate. Stems often simple from base, erect or decumbent basally, branched (several) distally, (0.8-)2-6.5 (-9) dm. Basal leaves (early withered); not rosulate; petiole 1-4 cm; blade obovate, spatulate, or ovate, (1.5-)3-10(-15) cm × 10-40 mm, margins sinuate to dentate or entire. Cauline leaves sessile; blade ovate, elliptic, oblong, or lanceolate, oblanceolate, or obovate, (1-)3-9(-15) cm × (5-)10-20(-50) mm, base sagittate-amplexicaul or auriculate, margins dentate or entire, (surfaces pubescent or glabrous). Racemes (corymbose panicles), slightly or considerably elongated in fruit; rachis glabrous or puberulent, trichomes straight or curved, cylindrical. Fruiting pedicels ascending to horizontal, straight, (terete), 5-10(-15) × 0.2-0.3 mm, glabrous or sparsely puberulent adaxially. Flowers: sepals oblong to ovate, 1.5-2.5 × 0.7-1.2 mm; petals white, obovate, (2.5-)3-4(-4.5) × (1-)1.3-2(-2.2) mm, claw 1-1.7 mm; stamens 6; filaments 2-3 mm, (glabrous); anthers 0.4-0.5 mm. Fruits (indehiscent), cordate to subreniform, (2-)2.5-3.7(-4.3) × (3.2-)3.7-5(-5.6) mm, apically (obtuse to subacute), not winged, apical notch absent; valves thin, smooth, reticulate-veined, glabrous; style (0.6-)1-1.8(-2) mm. Seeds ovate, 1.5-2.3 × 1-1.3 mm. 2n = 32, 64.