Native & Naturalized Plants of the Carolinas & Georgia


3805

Forb
Perennial

Non-native: east Asia
Documented growing wild in - NC -

Rare

Look for it in disturbed areas, on roadsides, per Weakley's Flora

map
To see a detailed map, click here


Invasive?

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

Georgia Exotic Pest Plant Council, 2006
Kentucky Exotic Pest Plant Council, 2013

 

LEAVES:
Simple
Alternate
Petioles 1-4cm long

FLOWER:
Summer
Calyx white (rarely tinged with pink)
Bisexual or pistillate
4-parted calyx
Petals absent
6-8 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 sachalinensis   FAMILY Polygonaceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Polygonum sachalinense   FAMILY Polygonaceae

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (1968) 063-04-024:
Polygonum sachalinense   FAMILY Polygonaceae

SYNONYMOUS WITH Flora of North America
Fallopia sachalinensis

 

COMMON NAME:
Giant Knotweed, Sachaline


Click or hover over the thumbnails to see larger pictures.

image of Reynoutria sachalinensis

JK Marlow    jkm160827_722

August    Henderson County    NC

image of Reynoutria sachalinensis

JK Marlow    jkm160827_723

August    Henderson County    NC

image of Reynoutria sachalinensis

JK Marlow    jkm150927_277

September    Henderson County    NC

image of Reynoutria sachalinensis

JK Marlow    jkm150927_279

September    Henderson County    NC

Stems usually clustered, erect, sparely branched, herbaceous, stiff, glabrous, per Flora of North America.

image of Reynoutria sachalinensis

JK Marlow    jkm150927_281

September    Henderson County    NC

image of Reynoutria sachalinensis

JK Marlow    jkm150927_284

September    Henderson County    NC

image of Reynoutria sachalinensis

JK Marlow    jkm150927_286

September    Henderson County    NC

image of Reynoutria sachalinensis

JK Marlow    jkm150927_290

September    Henderson County    NC

Inflorescences axillary, mostly distal, erect or spreading, paniclelike, per Flora of North America.

image of Reynoutria sachalinensis

JK Marlow    jkm150927_290b

September    Henderson County    NC

Fruiting perianth glabrous, wings flat to undulate, margins entire, per Flora of North America.

image of Reynoutria sachalinensis

JK Marlow    jkm150927_293

September    Henderson County    NC

image of Reynoutria sachalinensis

JK Marlow    jkm150927_297

September    Henderson County    NC

Leaf blade ovate-oblong, 15-30(-40)cm long, base cordate, margins entire, per Flora of North America.

image of Reynoutria sachalinensis

JK Marlow    jkm150927_298

September    Henderson County    NC

image of Reynoutria sachalinensis

JK Marlow    jkm150927_300

September    Henderson County    NC

Ocrea persistent or deciduous, brownish, cylindric, 6-12mm, margins oblique, per Flora of North America.