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
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 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.
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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 (4/14/23):
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
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.
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!
If a search such as "Carex leptalea var. leptalea" doesn't deliver the results you want, try "Carex leptalea".
Or, to minimize chances of a misspelling, try just "Carex le".
Less is more: If "pencil flower" doesn't deliver the results you want, try "pencil".