Ornduffia reniformis

Perennial to 130 cm high; stolons to 2 m long. Petioles of basal leaves to 68 cm long; floating leaves broad-ovate to circular or reniform, 3–8(–12) cm long, entire or occasionally crenate-dentate, usually deeply cordate, glossy-green above, paler or purplish beneath, blades of stranded plants erect, usually less dorsiventral and less deeply cordate to basally obtuse. Panicle erect, open, near summit of flowering stem. Flowers homostylous; calyx 6.5–12 mm long; corolla 19–43 mm diam., lobes (4–)5(–6), with broad entire to crenulate wings, not keeled; stigmas 2. Fruiting pedicels 7–25(–37) mm long, erect; capsule 6–12 mm long, c. equal to calyx, adnate to the calyx-tube only at the base; seeds ellipsoid to subglobular but strongly laterally compressed, (0.7–)1–1.5(–1.9) mm long, pale fawn to light brown, smooth or sometimes granular; caruncle absent. Flowers mostly Oct.–Mar., fruits mostly Oct.–Apr.