Oriental lady's thumb USDA PLANTS Symbol: PELO10
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Persicaria longiseta (Bruijn) Kitagawa

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Taxonomic Rank: Magnoliopsida: Polygonales: Polygonaceae
Synonym(s): Asiatic smartweed, bristled knotweed, bunchy knotweed

Oriental lady’s thumb is an annual forb that can reach 6-30 in. (15.2-76.2 cm) in height and can be either erect or sprawling. Leaves are elongate, narrow and pointed at the base and tip. Stems have swollen nodes with papery sheaths (ocrea). Ocrea have long, hair-like bristles on the margin. Flowering occurs from June to October, when pink flowers develop at the apex of the stems. Flowers are 1/8 in. (0.3 cm) long and occur in groups. Oriental lady’s thumb is native to Asia and occurs in disturbed habitats such as along roadsides and in pastures. Plants also inhabit wet areas.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Infestation;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Stem(s);
Chris Evans, Illinois Wildlife Action Plan, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Chris Evans, Illinois Wildlife Action Plan, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, 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(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.

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Invasive Listing Sources:
City of Ann Arbor Michigan Parks and Recreation
Connecticut Invasive Plant Working Group
Faith Campbell, 1998
Georgia Exotic Pest Plant Council
Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
Kentucky Exotic Pest Plant Council
Mid-Atlantic Exotic Pest Plant Council, 2005
Tennessee Exotic Pest Plant Council
Virginia Department of Conservation and Recreation, 2009