Flora of New Zealand Series

Plants floating on water surface, budding from lateral pouches, 3-5 or more platelets remaining attached together. Platelets orbicular to obovate in outline, pigmented red-purple on one or both surfaces, ± asymmetric, nerves absent or present. Roots 2-15 in a group. Inflorescence in lateral pouch, enclosed in spathe. Ovules 1-4. Fruit slightly winged. Seed longitudinally ribbed and transversely striate or smooth. Spp. 6, mostly widespread. Adventive sp. 1.