NameThatPlant.net: Reynoutria japonica var. japonica

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

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Reynoutria japonica var. japonica 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 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.

INCLUDED WITHIN PLANTS NATIONAL DATABASE:
Polygonum cuspidatum FAMILY Polygonaceae

INCLUDED WITHIN VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-023:

Polygonum cuspidatum FAMILY Polygonaceae

COMMON NAME:
Japanese Knotweed, Japanese Bamboo, Japanese Buckwheat

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

INCLUDED WITHIN PLANTS NATIONAL DATABASE:
Polygonum cuspidatum FAMILY Polygonaceae

INCLUDED WITHIN VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-023:
Polygonum cuspidatum FAMILY Polygonaceae

1122

Forb
Perennial
Monoecious or dioecious

Habitat: Roadsides, disturbed areas, river banks and sandbars, often forming dense thickets, per Weakley's Flora

Non-native: east Asia

Common in Mountains & in NC, rare in GA Coastal Plain, uncommon elsewhere in GA-NC-SC

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

LEAVES:
Simple
Alternate
Margins entire

FLOWER:
Spring/Summer/Fall
Calyx white (rarely tinged with pink)
5-parted calyx
Petals absent
8 stamens
Superior ovary
Functionally unisexual

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".