| 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 |
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| 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. |
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Identification, Biology, Control and Management Resources
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| Selected Images from Invasive.org | View 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 Alternative content
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 State(s) Where Reported invasive. Based on state level agency and organization lists of invasive plants from WeedUS database. Alternative content
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