noun
prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating masses
• Syn: ↑alligator grass, ↑Alternanthera philoxeroides
• Hypernyms: ↑weed
• Member Holonyms: ↑Alternanthera, ↑genus Alternanthera
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noun or alligator grassEtymology: so called from its long narrow leaves
: a prolific herbaceous weed (Alternanthera phylloxeroides) having opposite entire linear-lanceolate leaves and flowers in short headlike spikes and being especially troublesome in irrigation canals and waterways which it clogs with a dense floating mass
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alligator weed,
an aquatic plant with long, narrow leaves, commonly found in inland waters of the southeastern United States, where it is a troublesome weed, impeding navigation.
Useful english dictionary. 2012.