Plants 30-45(-85) cm tall. Basal leaf petiole (2-)5-8 cm; leaf blade 5-14 × 1.2-2.5 cm. Stem leaves ovate-elliptic, 3.5-8 × 1.3-3.5 cm. Calyx lobes apex obtuse, veins 1-3. Corolla yellow-green, with purple veins, 6-7 mm, tube 1-1.5 mm; lobes oblong-spatulate, 4-5 mm, apex obtuse. Inflorescences of male plants a large crowded panicle. Calyx lobes linear-lanceolate, 2-2.5 mm. Stamens fertile; filaments 1.5-2 mm; anthers ellipsoid, 0.8-1 mm. Pistil aborted. Inflorescences of female plants lax, racemelike, few flowered. Calyx lobes ovate-lanceolate, 4-5 mm. Corolla lobes obtuse, with a purple gland patch often divided longitudinally into 2 separate patches. Stamens sterile, ca. 0.5 mm. Pistil 4-5 mm. Ovary ovoid. Style indistinct; stigma lobes suborbicular. Capsules ovoid, 6-7 mm. Seeds dark brown, subdiscoid, 1.7-2 mm; broadly winged; seed coat reticulate. Fl. and fr. May-Aug.
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