Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales
WEAKLEY'S FLORA (11/30/12):
Reynoutria japonica
FAMILY
Polygonaceae
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Read Newsweek's article on Japanese Knotweed: The Invasive Plant That Eats the Value of Your Home
Read more about Japanese Knotweed at Vascular Plants of North Carolina.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Polygonum cuspidatum
FAMILY
Polygonaceae
SYNONYMOUS WITH
Generic Limits in Polygonum (Ronse Decraene & Akeroyd, 1988)
Fallopia japonica
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-023:
Polygonum cuspidatum
FAMILY
Polygonaceae
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Pleuropterus zuccarinii
COMMON NAME:
Japanese Knotweed
To see larger pictures, click or hover over the thumbnails.
JK Marlow jkm160322_058
March Greenville County SC
Riparian zone along urban waterway
Stems erect, stout, striate, papillate, often with red or purple spots, per Flora of China.
JK Marlow jkm160322_059
March Greenville County SC
Riparian zone along urban waterway
Ocrea oblique, per Flora of China.
JK Marlow s050406_a
April Greenville County SC
Roadside
Mid-branch leaves truncate (to very broadly V-shaped), per Weakley's Flora (2012).
JK Marlow jkm0407a_37
July Greenville County SC
Mortgage lenders in the UK may refuse to loan on property with Japanese Knotweed
JK Marlow jkm0407b_13
July Greenville County SC
Roadside
Flowers in axillary, paniculate racemes. Calyx 1.5-2mm long in flower, per Vascular Flora of the Carolinas.
JK Marlow s080705_a
July Swain County NC
Veins of leaf underside minutely scabrous with scattered bumps, per Weakley's Flora (2012).
WEAKLEY'S FLORA (11/30/12):
Reynoutria japonica
FAMILY
Polygonaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Polygonum cuspidatum
FAMILY
Polygonaceae
SYNONYMOUS WITH
Generic Limits in Polygonum (Ronse Decraene & Akeroyd, 1988)
Fallopia japonica
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-023:
Polygonum cuspidatum
FAMILY
Polygonaceae
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Pleuropterus zuccarinii