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Europe and Africa
Curly pondweed has long, narrow alternating leaves that are l-3 inches long. The veins of the leaf branch from a larger middle vein.
This plant can from dense mats at the surface and can shade out native plants. These mats reduce fishing areas, and may cause fish kills when they decompose.
Curly pondweed spreads by hardened buds (sometimes called turions) and by seeds.