Plants 50--120 cm tall, glabrous or pubescent. Stems branched distally. Basal and proximal cauline leaves withered at anthesis. Middle cauline leaves petiolate; petiole 1--4 cm; leaf blade 3-or 4-pinnate, 9--20 cm; leaflet blade rhombic-obovate, broadly rhombic, or orbicular, 0.5--1(--1.4) × 0.3--1(--1.4) cm, thinly leathery, base rounded or subcordate, apex acute, 3-lobed; lobes entire or 2-toothed; veins raised abaxially. Inflorescence paniculate. Pedicel slender, 4--14 mm. Sepals deciduous, greenish white, narrowly elliptic, 3--4 mm. Stamens many, 6--8 mm; filament filiform; anther narrowly oblong, 2--2.6 mm, apex mucronate. Carpels 4--9. Achenes sessile; body hemiobovoid, ca. 3.5 mm; veins ca. 8. Fl. Jun--Jul.
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