Native & Naturalized Plants of the Carolinas & Georgia


2937

Emergent aquatic (rooted along shoreline, but floating mats can detach), Forb
Perennial

Non-native: Tropical America
Documented growing wild in GA NC SC

Common. A serious weed of natural areas

Look for it floating in mats on the surface of the waters of blackwater rivers, sloughs, ditches, ponds, and in very moist soils of ditches & shores, per Weakley's Flora

map
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INVASIVE

This plant is causing problems in natural areas outside its native range, according to authorities such as:

Alabama Invasive Plant Council, 2012
Georgia Exotic Pest Plant Council, 2006
Kentucky Exotic Pest Plant Council, 2013
Mid-Atlantic Exotic Pest Plant Council
NC Department of Transportation
SC Department of Agriculture Noxious Weed List, 2017
SC Department of Natural Resources Aquatic Nuisance Species List, 2003
Tennessee Exotic Pest Plant Council, 2009
US Forest Service Southern Research Station
Virginia Department of Conservation and Recreation, 2014

 

Aquatic ...Wet

LEAVES:
Simple
Opposite

FLOWER:
Spring/Summer/Fall
White
Bisexual
5 sepals
Petals absent
5 stamens, united at base

FRUIT:
Spring/Summer/Fall
Utricle

 

TO LEARN MORE about this plant, look it up in a good book!



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