IUCN threat status:

Least Concern (LC)

Comprehensive Description

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On the basis of the foliage alone, Horned Pondweed is difficult to distinguish from such aquatic plants as grassy pondweeds (Potamogeton spp.) and naiads (Najas spp.). However, its clusters of small beaked fruits are quite distinctive and they can be found on its foliage throughout most of the summer. Pondweeds produce their flowers/fruits on short spikes that are held either slightly above the surface of the water or underwater. Naiad species produce their flowers/fruits at the bases of their leaves, but they are produced individually (a single fruit per leaf) rather than in clusters. Most species of Naiad also have leaves with fine teeth that can be seen by either the naked eye or with a 10x hand lens.

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© John Hilty

Source: Illinois Wildflowers

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