Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales
WEAKLEY'S FLORA (11/30/12):
Alternanthera philoxeroides
FAMILY
Amaranthaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Alternanthera philoxeroides
FAMILY
Amaranthaceae
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (1968) 066-01-002:
Alternanthera philoxeroides
FAMILY
Amaranthaceae
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Achyranthes philoxeroides
COMMON NAME:
Alligator-weed
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USDA-NRCS PLANTS Database / USDA Wetland flora: Field office illustrated guide pnd_alph_003_lvd
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Richard and Teresa Ware rtw_a_philoxeroides
June
Small, white, rounded cloverlike clusters of tiny flowers are 0.5-0.7" wide, per A Field Guide for the Identification of Invasive Plants in Southern Forests.
COMPARE
aquatic plants
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JK Marlow jkm160914_110
September
SE-EPPC Aquatic Plant ID Workshop
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James H. Miller, USDA Forest Service, Bugwood.org bug_1539028
Month Unknown
Leaves somewhat succulent, obtuse to rounded at the tip, per Weakley's Flora.
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Gary Buckingham, USDA Agricultural Research Service, Bugwood.org bug_4723003
Month Unknown
Each flower w 5 minute petals (actually sepals) surrounding yellow anthers, per A Field Guide for the Identification of Invasive Plants in Southern Forests.
)
Julia Scher, Federal Noxious Weeds Disseminules, USDA APHIS ITP, Bugwood.org bug_5376307
Month Unknown
)
James H. Miller, USDA Forest Service, Bugwood.org bug_5379494
Month Unknown
)
James H. Miller, USDA Forest Service, Bugwood.org bug_5422002
Month Unknown
)
Nancy Loewenstein, Auburn University, Bugwood.org bug_5471274
Month Unknown
Bracts not keeled. Peduncles 1-7cm, from the leaf axils or terminal, per Weakley's Flora.