Plants ca. 120 cm tall, glabrous. Stems branched, sulcate. Basal leaves withered at anthesis. Proximal cauline leaves ca. 30 cm (including petiole); stipules narrow, margin entire or lobed; petiole ca. 8 cm; leaf blade 3-pinnate, ca. 20 cm; leaflet blade ovate, rhombic-ovate, elliptic, or cuneate-obovate, 0.8--2.1 × 0.6--1.6 cm, herbaceous, base cuneate, rounded, or subcordate, margin 3-lobed; lobes entire; veins flat on both surfaces. Inflorescence paniculate, spreading, slender. Pedicel 20--35 mm. Sepals 4, early deciduous, white, obovate or narrowly ovate, 3--4 × 1.2--1.6 mm. Stamens ca. 4.5 mm; filament narrowly linear or filiform; anther narrowly oblong, 1.3--2 mm, apex obtuse. Carpels 2 or 3(--5); style short; stigma persistent, ca. 0.4 mm. Achenes sessile; body ovoid, 3--3.5 mm; veins 8 or 9. Fl. Jun--Jul.
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