Native & Naturalized Plants of the Carolinas & Georgia


1122

Forb
Perennial
Monoecious or dioecious

Non-native: East Asia
Documented growing wild in GA NC SC

Uncommon in GA-NC-SC

Look for it on roadsides, disturbed areas, riverbanks and sandbars, often forming dense thickets, 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
Brooklyn Botanic Garden
Georgia Exotic Pest Plant Council, 2006
Kentucky Exotic Pest Plant Council, 2013
NC Department of Transportation
SC Exotic Pest Plant Council, 2014
Tennessee Exotic Pest Plant Council, 2009
US Fish & Wildlife Service
US Forest Service Southern Research Station
Virginia Department of Conservation and Recreation, 2014

 

LEAVES:
Simple
Alternate

FLOWER:
Spring/Summer/Fall
Calyx white (rarely tinged with pink)
Functionally unisexual
5-parted calyx
Petals absent
8 stamens
Superior ovary
Flowers in axillary paniculate racemes

FRUIT:
Summer/Fall
Brown, lustrous
Nutlet

 

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):
Reynoutria japonica   FAMILY Polygonaceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Polygonum cuspidatum   FAMILY Polygonaceae

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (1968) 063-04-023:
Polygonum cuspidatum   FAMILY Polygonaceae

SYNONYMOUS WITH Generic Limits in Polygonum (Ronse Decraene & Akeroyd, 1988)
Fallopia japonica

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933)
Pleuropterus zuccarinii

 

COMMON NAME:
Japanese Knotweed