OF THE CAROLINAS & GEORGIA

Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Reynoutria sachalinensis   FAMILY Polygonaceae   Go to FSUS key



SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Polygonum sachalinense   FAMILY Polygonaceae

SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)

Reynoutria sachalinensis

SYNONYMOUS WITH Flora of North America north of Mexico, vol. 5 (2005)

Fallopia sachalinensis

SYNONYMOUS WITH Floristic Synthesis of North America (Kartesz, 1999)

Polygonum sachalinense

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-024:

Polygonum sachalinense   FAMILY Polygonaceae

 

COMMON NAME:
Giant Knotweed, Sachaline


         To see larger pictures, click or hover over the thumbnails.

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

JK Marlow    jkm160827_722

August    Henderson County    NC

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

JK Marlow    jkm160827_723

August    Henderson County    NC

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

JK Marlow    jkm150927_277

September    Henderson County    NC

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

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, Giant Knotweed, Sachaline

JK Marlow    jkm150927_281

September    Henderson County    NC

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

JK Marlow    jkm150927_284

September    Henderson County    NC

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

JK Marlow    jkm150927_286

September    Henderson County    NC

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

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, Giant Knotweed, Sachaline

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, Giant Knotweed, Sachaline

JK Marlow    jkm150927_293

September    Henderson County    NC

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

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, Giant Knotweed, Sachaline

JK Marlow    jkm150927_298

September    Henderson County    NC

image of Reynoutria sachalinensis, Giant Knotweed, Sachaline

JK Marlow    jkm150927_300

September    Henderson County    NC

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

 

 

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Reynoutria sachalinensis   FAMILY Polygonaceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Polygonum sachalinense   FAMILY Polygonaceae

SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Reynoutria sachalinensis

SYNONYMOUS WITH Flora of North America north of Mexico, vol. 5
Fallopia sachalinensis

SYNONYMOUS WITH Floristic Synthesis of North America (Kartesz, 1999)
Polygonum sachalinense

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-024:
Polygonum sachalinense   FAMILY Polygonaceae

 

Find by SCIENTIFIC NAME:

3805

Forb
Perennial

Habitat: Disturbed areas, roadsides, per Weakley's Flora

Non-native: east Asia

Common in NC Mountains (rare elsewhere in GA-NC-SC)

map
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.


Invasive?

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

 

LEAVES:
Simple
Alternate
Petioles 1-4cm long
Margins entire

FLOWER:
Summer
Calyx white (rarely tinged with pink)
4-parted calyx
Petals absent
6-8 stamens
Superior ovary
Bisexual or pistillate

Flowers in axillary paniculate racemes

FRUIT:
Summer/Fall
Brown, lustrous
Nutlet

 

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



 


Find by SCIENTIFIC NAME: