Lepidium procumbens Linnaeus, Sp. Pl. 2: 643. 1753; Capsella procumbens (Linnaeus) Fries; Hutchinsia procumbens (Linnaeus) Desvaux; Hymenolobus procumbens (Linnaeus) Nuttall ex Torrey & A. Gray.
Herbs annual, (2-)5-22(-30) cm tall, glabrous throughout or puberulent with minutely forked trichomes. Stems erect, ascending, or decumbent, branched at base or rarely simple. Basal leaves rosulate or not; petiole (2-)5-12(-20) mm; leaf blade obovate, oblanceolate, or oblong, (0.2-)1-2.5(-4) cm Ч (1-)5-11(-16) mm, base cuneate or attenuate, margin entire, dentate, or pinnatifid, apex acute or obtuse. Cauline leaves similar to basal ones, progressively smaller and subsessile upward. Racemes few to several flowered; rachis straight or slightly flexuous in fruit. Fruiting pedicels slender, divaricate, 3-8(-12) mm. Sepals ovate, 0.6-1.1 Ч 0.4-0.6 mm. Petals white, spatulate, 0.6-1.2 Ч 0.3-0.6 mm. Filaments white, 0.5-1 mm; anthers ovate, ca. 0.1 mm. Ovules 10-24 per ovary. Fruit oblong, elliptic, or obovate, (2-)3-4(-4.5) Ч (1-)1.4-2.2 mm, apex subtruncate to slightly emarginate; valves glabrous, with prominent reticulate veins; style obsolete or to 0.1 mm. Seeds brown, oblong, plump, 0.5-0.6 Ч 0.3-0.4 mm. Fl. and fr. Apr-Jul. 2n = 12, 24.