Flora of New Zealand Series

Infl. in lateral pouch, enclosed in spathe. Ovules 1–4. Fr. slightly winged. Seed longitudinally ribbed and transversely striate or smooth. Plants floating on water surface, budding from lateral pouches, 3–5 or more platelets remaining attached together. Platelets orbicular to obovate in outline, ± asymmetric; nerves absent or present. Roots 2–15, in a group. All spp. pigmented red-purple on one or both surfaces. About 5 spp., mostly widespread.