Herbs annual, 1-12(-30) cm tall. Stems subdecumbent to erect, few branched or rarely simple at base, pubescent with short-stalked to subsessile, stellate trichomes. Basal leaves not rosulate, subsessile, often withered by fruiting, pubescent as stems; leaf blade oblanceolate, obovate, or lanceolate, 0.2-2(-3.2) cm × 1-9(-15) mm, margin entire, repand, or obscurely dentate, apex acute. Middle cauline leaves oblong or ovate, sessile, 0.2-2(-3.5) cm × 1-8(-15) mm, base auriculate, margin entire or repand, apex acute. Fruiting pedicels slender, stellate pubescent, divaricate, 1-4(-6) mm. Sepals oblong, 1.1-1.5 × 0.3-0.5 mm, pubescent. Petals yellow, turning whitish when dry, spatulate or oblanceolate, 1.6-1.9 × 0.4-0.5 mm, attenuate to base; claw absent. Filaments 1.2-1.6 mm; anthers oblong, 0.1-0.2 mm. Fruit linear, terete, curved or straight, 4-10(-13) × 0.7-0.9 mm, only slightly torulose; valves pubescent with subsessile, 3-rayed trichomes, usually with a distinct midvein; septum perforated or reduced to a rim; style 0.1-0.5 mm. Seeds brown, 5-18(-20) per fruit, oblong, uniseriate, 0.5-0.8 × 0.3-0.4 mm. Fl. Mar-May, fr. Apr-Jun. 2n = 48.
Home