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Zannichellia (common name horned pondweed) is a genus of submerged Aquatic plant flowering plant, (1993). 9780870238338, University of Massachusetts Press. ISBN 9780870238338 with threadlike leaf and tiny . It is fully adapted to an aquatic life cycle, including underwater Hydrophily.
There are perhaps five species, including Zannichellia palustris.
The genus is named after Gian Girolamo Zannichelli (1662–1729), Italian botanist.
The flowers are unisexual. The male flowers have a single stamen with a slender filament and anthers that are 2-4-Theca.
The female flowers have a cup-shaped membranous perianth. There are usually four carpels with a single pendulous ovule in each ovary. The stigma is shield shaped with toothed margins.
The fruit is usually made of four long, dry achenes. The seeds are pendulous with a sub-cylindric embryo. The cotyledonous end is folded on itself twice.
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