Stolons usually lacking. Leaves aerial, erect; blades sagittate, apex acuminate, lateral lobes 6-9 cm, middle lobe 4.5-8 × 2.5-6 cm, with 3-11 bulbs in each sheath. Inflorescences paniculate, 15-20 cm, in 4 to many whorls of (2 or)3 flowers, lowest whorl usually branched; female flowers on lowest 1(or 2) whorls; bracts free or connate toward base. Flowers unisexual. Sepals not reflexed, ovate, ca. 7 × 4 mm. Petals suborbicular, 6-7 × ca. 5 mm. Stamens 15-18; anthers yellow. Achenes 0.8-1 × 0.4-0.5 mm, narrowly winged, with a short beak. Fl. and fr. Jul-Aug. 2n = 22*.
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