Brasenia schreberi

Stems 3–10 mm diam., covered in mucilage. Leaves elliptic, 2.5–9 cm long, 1.5–6 cm wide; petioles to 30 cm long or more (bringing leaf to water surface); young leaves inrolled longitudinally. Flowers long-pedicellate (bringing flower to water surface); perianth segments 9–18 mm long, dark reddish-black or purplish; stamens 12–37, filaments reaching 1 cm long (extending after pollination of stigma); carpels 6–16, ovules usually 2 per carpel. Fruit beaked. Flowers Oct.–Feb.