Plants 0.6--1.6 m tall, glabrous. Stems dichotomously branched, sulcate. Basal leaves withered at anthesis. Cauline leaf petiole 1--4 cm; leaf blade 2-or 3-pinnate, 8--18 cm; leaflet blade oblong, cuneate-obovate, broadly obovate, or orbicular-ovate, 0.8--2(--3.5) × 0.6--1.5(--2.6) cm, papery or thinly leathery, abaxially powdery white, base cuneate to rounded, margin 3-lobed; lobes entire or 2-or 3-toothed, apex acute; veins flat on both surfaces. Inflorescence paniculate, dichotomously branched, flat topped. Pedicel slender, 1.5--3 mm. Sepals 4, deciduous, yellow, tinged greenish, narrowly ovate, ca. 3 × 0.8 mm. Stamens 5--15, 3--5 mm; filament filiform; anther ca. 2.2 mm, apex mucronate. Carpels 1--3(--5); stigma sagittate, ca. 0.6 mm. Achenes sessile; body narrowly obovoid or fusiform, 4--5.2 mm; veins ca. 8, stout. Fl. Jul--Aug.
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