Sp. Pl. 2: 969. 1753; Gen. Pl. ed. 5; 416, 1754.

Common names: Horned-pondweed
Etymology: for Gian Girolamo Zannichelli, 1662–1729, Venetian apothecary and botanist
Treatment appears in FNA Volume 22.

Roots single or in pairs at nodes. Leaves: blade entire, veins 1[–3], nearly terete. Inflorescence usually of 2 flowers, 1 staminate, 1 pistillate. Flowers short-pedicellate. Staminate flowers: anthers 4-loculed. Pistillate flowers: pistils surrounded proximally by membranaceous envelope; stigma asymmetrically funnel-shaped. Fruits: convex margin minutely dentate; endocarp often coarsely papillose (visible after decay of outer fruit wall); stipe developing into podogyne (stalk supporting pistil).


Nearly worldwide.


Species ca. 5 (1 in the flora).

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