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Volume III (1980) - Flora of New Zealand Adventive Cyperaceous, Petalous & Spathaceous Monocotyledons
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Spirodela

SPIRODELA Schleiden

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.

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