BugwoodWiki Article

cultivated knotweed
Persicaria wallichii Greuter & Burdet

Overview

Appearance
Persicaria wallichii is a perennial plant that can grow from 23.6-78.7 in. (60-200 cm) tall.
Foliage
Leaves are alternate or basal, oval to lanceolate in shape, moderately hairy, and 3.9-7.9 in. (10-20 cm) long with heart shaped bases and pointed tips.
Flowers
Flowers are white to pink, 0.12-0.2 in. (3-5 mm) long, fragrant, and found in clusters from 7.9-13.8 in. (20-35 cm) long. Flowers bloom from mid summer to late fall.
Fruit
Seeds are dark brown in color, ovoid, 3 angled, smooth, and 0.04-0.08 in. (1-2 mm) long. They are transported mostly by water and wind.
Ecological Threat
Persicaria wallichii can be found in moist soils and in fields, pastures, and waste areas. It is native to the Himalayan region.

Selected Images


5386350
5386350

cultivated knotweed
Persicaria wallichii
Plant(s)
Joseph M. DiTomaso
5386351
5386351

cultivated knotweed
Persicaria wallichii
Flower(s)
Joseph M. DiTomaso
5386352
5386352

cultivated knotweed
Persicaria wallichii
Foliage
Joseph M. DiTomaso

Maps


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

State Regulated List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Caryophyllidae
Order: Polygonales
Family: Polygonaceae
Genus: Persicaria

Synonyms and Other Names

Other Common Names:
Himalyan knotweed

Related Scientific Names:

Polygonum polystachyum Wallich ex Meisn.(Synonym)

Categories

Category: Forbs/Herbs

References

Common Name Reference:

Scientific Name Reference: