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Alternanthera philoxeroides
/ˈɒltənˌanθəɹə fˈɪləksəɹˌɔɪdz/
/ˈɑːltɚnˌænθɚɹə fˈɪləksɚɹˌɔɪdz/Alternanthera philoxeroides
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prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating masses
