Alligator weed

Family: Amaranthaceae
Scientific name: Alternanthera philoxeroides
Description: Plant Form: Creeping aquatic weed. Size: Mats of up to 15 m. Stem: Hollow, interwoven, creeping, up to 60 cm tall and 10 m long. Leaves: Spear shaped without stalk, in opposite pairs. Flowers: Small, white, papery 8-10 mm diameter on short stalks. Fruit and Seeds: Reproduces vegetatively. Habitat: Riparian areas and floodplains. Distinguishing Features: Distinguished from other Alternanthera species by the flowers being on stalks. Weed Status: Priority Weed Weed Type: Environmental, Agricultural Lifeform: Aquatic

Example images for this weed

National and state/territory profiles for this weed

Weeds Australia
NSW WeedWise (NSW)
DEECA (VIC)
! Should be reported
QDAF (QLD)
! Should be reported
PIRSA (SA)
! Should be reported
DNRE (TAS)
! Should be reported
DEPWS (NT)
! Should be reported
NSW WeedWise (ACT)
! Should be reported