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Alligatorweed

Alternanthera phyloxeroides

Amaranthaceae (Pigweed Family)

▲▼ infestation at Black Bayou, near Monroe, LA

▲▼ flowering stems

▲▼ inflorescences

Alternanthera phyloxeroides (Mart.) Griseb.; Alligatorweed: (Bayer Code:  ALRPH; US Code ALPH)

·         Warm-climate terrestrial to aquatic creeping perennial weed with spreading growth habit; produces stolons

·         Leaves opposite, lanceolate, usually with pointed tips, hairless to with short hairs

·         Flowers tiny, paper-like, white in globe-shaped clusters at tips of flowering stalks 0.4 to 2 inches long (sometimes longer)

·         Problematic aquatic weed in warmer climates

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Updated 15 January 2019