Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Widespread weed in lowlands.
Origin: Introduced from Eurasia
Conservation Status: Not of concern
Herbaceous perennial from strong rhizomes, the stems erect to decumbent, 2-5 dm. tall, puberulent to hoary-pubescent.
Leaves alternate, ovate-oblong to oblong-oblanceolate, denticulate to dentate, 4-10 cm. long, the lower ones petiolate, the upper sessile and sagittate-clasping.
Inflorescence of bractless, dense, numerous, rather flat-topped racemes; pedicles slender, 1 cm. long; sepals 4, 2 mm. long, early-deciduous; petals 4, white, 3-4 mm. long; stamens 6; style slender, 1 mm. long
Silicles inflated, cordate-ovoid, cordate at the base and rounded or slightly notched at the tip, 3-5 mm. long and 4-6 mm. broad, glabrous; seeds 1 per cell, 2 mm. long.
Separated from Cardaria pubescens by the glabrous silicle.