Plants 80--100 cm tall, glabrous. Stems branched, sulcate. Basal and proximal cauline leaves withered at anthesis. Cauline leaf stipules semiorbicular; petiole 1.8--2.3 cm; leaf blade 3-or 4-pinnate, 15--26 cm; leaflet blade ovate, broadly so, cuneate-obovate, or rhombic, 1.5--3 × 1--1.7(--2.3) cm, herbaceous, base rounded or subcordate, apex 3-lobed; lobes entire; veins flat on both surfaces. Inflorescence paniculate, ca. 30 cm. Pedicel slender, 8--25 mm. Sepals 4(or 5), deciduous, elliptic-ovate; 3--5 × ca. 2 mm. Stamens ca. 6 mm; filament narrowly linear, narrower than anther; anther 2--2.5 mm, apex mucronate. Carpels 12--14; style short; stigma elliptic. Achenes sessile; body obliquely narrowly obovoid, ca. 8 mm; veins ca. 8, stout. Fl. Jun.
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