Nymphoides geminata

Perennial or annual; stems to 1 m long, floating, stoloniferous, often reduced to a few cm long on stranded plants. Petioles of basal leaves 1–60 cm long; blades c. circular or very broadly ovate, entire, deeply cordate, 1–6 cm long. Flowers homostylous, in spaced pairs along a short inflorescence or the pairs loosely clustered on plants growing on mud; calyx 3–6 mm long; corolla 12–25(–33) mm diam., lobes 5(–6), with broad laciniate wings, not keeled; stigmas 2, sometimes 3. Capsule 3–6.5 mm long, c. equal to calyx; seeds globular to slightly ellipsoid-globular, somewhat laterally compressed, 0.6–1 mm long, black when mature, usually with prominent spaced obtuse tubercles, sometimes smooth; caruncle circular, pale. Flowers and fruits mostly Oct.–May.