Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Reynoutria sachalinensis
FAMILY
Polygonaceae
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Read more about Giant Knotweed at Vascular Plants of North Carolina.
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
Fallopia sachalinensis
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.
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JK Marlow jkm160827_722
August Henderson County NC
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JK Marlow jkm160827_723
August Henderson County NC
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JK Marlow jkm150927_277
September Henderson County NC
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JK Marlow jkm150927_279
September Henderson County NC
Stems usually clustered, erect, sparely branched, herbaceous, stiff, glabrous, per Flora of North America.
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JK Marlow jkm150927_281
September Henderson County NC
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JK Marlow jkm150927_284
September Henderson County NC
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JK Marlow jkm150927_286
September Henderson County NC
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JK Marlow jkm150927_290
September Henderson County NC
Inflorescences axillary, mostly distal, erect or spreading, paniclelike, per Flora of North America.
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JK Marlow jkm150927_290b
September Henderson County NC
Fruiting perianth glabrous, wings flat to undulate, margins entire, per Flora of North America.
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JK Marlow jkm150927_293
September Henderson County NC
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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.
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JK Marlow jkm150927_298
September Henderson County NC
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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 (4/24/22):
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
Fallopia sachalinensis
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-024:
Polygonum sachalinense
FAMILY
Polygonaceae
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)
Click here to see a map, notes, and images from Weakley's Flora of the Southeastern US.
Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)
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)
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!