Annuals, (8-)30-60(-100) cm tall. Stems slender, distinctly angled or subterete, branched, sparsely to densely covered with simple trichomes (0.1-)0.3-0.4(-0.5) mm, rarely glabrescent or glabrous. Basal leaves and lowermost cauline leaves pinnate, with 2-5 pairs of lateral leaflets, often withered at fruiting, pilose with subappressed, simple, straight trichomes; petiole 0.5-2 cm; leaflets membranous, oblong or ovate-lanceolate, 5-20 × 2-9 mm, sparsely pubescent or rarely glabrous, base cuneate, margin deeply serrate or entire, apex obtuse, with a minute callose mucro; upper cauline leaves similar to lower ones but progressively shorter upward. Racemes terminal and lateral, many flowered, elongated in fruit. Fruiting pedicels 4-7 mm, slender, straight, divaricate or slightly recurved, glabrous or pilose. Sepals ovate, 1-1.5 mm. Petals white, obovate, 2-2.5 × ca. 0.7 mm. Filaments ca. 1 mm. Ovules (2-)4-20(-24) per ovary. Fruit oblong-linear, oblong, narrowly ovoid, or globose, 1.5-4 × 1-1.5 mm, not compressed, sessile; valves membranous, papillate or pilose; style 0.5-0.8 mm. Seeds brown, oblong-ovate, 0.6-1(-1.1) × 0.4-0.5(-0.6) mm, reticulate. Fl. Jul-Aug, fr. Aug-Oct.
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