An aquatic plant (Hydrilla verticillata) native to Eurasia, Africa, and Australia, having whorled, lance-shaped leaves and small white flowers. It is considered a weed in North America, where it forms large dense mats in waterways.
- Hydrilla verticillata
Origin of Hydrilla
New Latin genus name diminutive of Latin hydra hydra hydra
From American Heritage Dictionary of the English Language, 5th Edition
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