Australian Native Plants

  Persicaria decipiens (Slender Knotweed)


Persicaria decipiens photo
Persicaria decipiens plant

Photograph by Harry Rose. Some rights reserved.    (view image details)

Persicaria decipiens photo
Persicaria decipiens leaves

Photograph by Harry Rose. Some rights reserved.    (view image details)

Persicaria decipiens photo
Persicaria decipiens habit

Photograph by Harry Rose. Some rights reserved.    (view image details)



Credits:
Description and Habitat information is sourced from: State of Victoria (Agriculture Victoria), Victorian Resources Online,http://vro.agriculture.vic.gov.au/dpi/vro/vrosite.nsf/pages/water_sip_scientific_a Licensed under Creative Commons CC BY 4.0 license.


Growth Characteristics information is sourced from: State Flora Catalog, Government of South Australia Licensed under Creative Commons CC BY 4.0 license.



SLENDER KNOTWEED FACTS

distribution map showing range of Persicaria decipiens in Australia

Map is from The Atlas of Living Australia web site, licensed under Creative Commons Attribution 3.0 Australia License


Common Name
Slender Knotweed

Description
Slender Knotweed is a decumbent to ascending annual or perennial herb to 30 cm high. Leaves are narrow-elliptic to lanceolate (spear-shaped), from 5-12 cm long and 5-13 cm wide and often with a purple blotch near the middle of the upper surface.

Flower-heads are rather lax to drooping, elongated cylindrical spikes, 2-6 cm long and 3-4 mm diameter and flower parts 1.7-2.5 mm long. The fruit is a dark brown to black, lens-like or triangular nut, 1.5-2 mm long.

Habitat
Semi-aquatic plants of freshwater environments. Grows in water and on wet flats at the edges of rivers, lagoons and lakes and in marshes, swamps and drainage lines. High waterlogging tolerance.

Distribution
Australian native, all States. South Australia, Western Australia, Victoria., New South Wales, Queensland, Australian Capital Territory, Northern Territory, Tasmania.

Growth Characteristics
Height (m): 0.2 - 0.5
Spread (m): 0.3 - 1
Soil Texture: sand, loam, clay
Soil pH: acid soils, neutral soils
Frost Sensitivity: moderately sensitive
Minimum Rainfall (mm): the species is best suited to constantly moist sites
Flower Colour: pink
Flower Season: winter, spring

(source: SA State Flora Catalog)



Classification
Class:Magnoliopsida
Order:Caryophyllales
Family:Polygonaceae
Genus:Persicaria
Species:decipiens
Common Name:Slender Knotweed