Bohemian knotweed, Hybrid Japanese knotweed
U.S. Nativity: Exotic
Habit: Forbs/Herbs Shrub or Subshrub
Reynoutria x bohemica Chrtek & Chrtková
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Taxonomic Rank: Magnoliopsida: Polygonales: Polygonaceae
Appearance
Fallopia x bohemica is a perennial that can grow from 6-12 ft. (1.8-3.7 m) tall.
Foliage
Stems are usually erect, clustered, and glabrous. Leaves are ovate, base is truncate to cordate, entire margins, and acute tips.
Flowers
Flowers are white to pink, 0.16-0.24 in. (4-6 mm), tepals are obovate to elliptic, and apex is obtuse to acute. Flowering occurs between July and October.
Fruit
The fruits are dark brown in color, shiny, 0.08-0.12 (2-3 mm) long, smooth, and three sided with flat wings that are 0.06-0.08 in. (1.5-2.1 mm) wide.
Ecological Threat
Fallopia x bohemica prefers disturbed areas such as fields, pastures, and along roadsides and railways. It is native to Japan.
Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s); habitat
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage
Plant(s); herb
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage
Stem(s); sprout
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage
Stem(s); herb
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage

Stem(s); herb
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage
Foliage;
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage
Foliage;
Robert Vidéki, Doronicum Kft., Bugwood.org
Additional Resolutions & Image Usage
Fruit(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage
Flower(s);
Richard Gardner, , Bugwood.org
Additional Resolutions & Image Usage
EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org 		 


State List
This map identifies those states that list this species on their invasive species list or law.

Invasive Listing Sources:
California Invasive Plant Council
Native Plant Society of Oregon, 2008
Ohio Invasive Species Council
Pacific Northwest Exotic Pest Plant Council, 1998