Chinese knotweed

Names and Synonyms

Common Names

• Chinese knotweed

Scientific Names

Accepted name

Synonyms

• Cephalophilon chinense
• Polygonum chinense
• Ampelygonum chinense

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta, falling under the class Equisetopsida and subclass Magnoliidae. It is classified within the order Caryophyllales and the family Polygonaceae. Finally, its taxonomic designation is completed under the genus Persicaria.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a wide geographical distribution across several key regions. In the Western Indian Ocean, it can be specifically found on the island of Réunion. Within China, its presence is widespread, covering the North-Central provinces. It is also commonly documented throughout the South-Central areas of the country. Finally, the species extends its reach into the Southeast regions of China.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Persicaria chinensis is characterized by its broad adaptability across diverse altitudinal gradients, allowing it to inhabit a wide spectrum of montane and lowland environments. This species demonstrates a significant vertical distribution, ranging from low-lying areas at an elevation of 30 m AMSL to high-altitude habitats reaching up to 3000 m AMSL. The ecological niche of the plant is centered around a mean elevation of approximately 1671.67 m AMSL, suggesting that while it can tolerate various topographical conditions, it frequently thrives within mid-to-high elevation subtropical or temperate zones. This extensive elevational range indicates a robust capacity to withstand varying temperature regimes and atmospheric pressures, facilitating its presence across a multifaceted range of ecological landscapes.

Elevational range max:

3000 m AMSL

Elevational range mean:

1671.66666666667 m AMSL

Elevational range min:

30 m AMSL

Life history

The life history of Persicaria chinensis is characterized by its status as a perennial plant, allowing it to persist through multiple growing seasons. In terms of its structural growth strategy and ecological positioning, it is classified as a phanerophyte, specifically exhibiting the traits of a phanerophyte in both its life form classifications. This indicates that its perennating buds are elevated above the ground level, contributing to its enduring presence within its natural habitat.

Life form :

phanerophyte

Lifecycle :

perennial

Morphology

The morphology of Persicaria chinensis is characterized by its growth form as a non-woody herb and forb. This plant is a self-supporting species, functioning neither as a climber (neither liana nor vine) nor as an epiphyte, as it maintains a strictly terrestrial existence. It is an independent organism, exhibiting no parasitic behavior. In terms of stature, the plant can reach a maximum height of 1.5 m, and while it can inhabit various environments, its primary ecological classification spans across aquatic, semiaquatic, and terrestrial habitats.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Growth form :

forb

Parasite :

independent

Plant height max:

1.5 m

Woodiness :

non-woody

Physiology

The physiology of Persicaria chinensis is characterized by a significant morphological plasticity in its foliar development, which directly influences its photosynthetic capacity and resource acquisition strategies. The leaf dimensions exhibit considerable variability, with a mean leaf length of 10 cm and a range extending from a minimum of 4 cm to a maximum of 16 cm. This longitudinal variation is complemented by a dynamic width profile; the leaf width typically averages 5 cm, though it can fluctuate between a minimum of 2 cm and a maximum of 8 cm. Such variations in the surface area of the lamina suggest an adaptive physiological response to light interception and transpiration demands within its environment. The ratio of length to width across these measurements indicates a versatile leaf structure that can transition between narrow and broader forms, optimizing the plant's metabolic efficiency and gas exchange processes.

Leaf length max:

16 cm

Leaf length mean:

10 cm

Leaf length min:

4 cm

Leaf width max:

8 cm

Leaf width mean:

5 cm

Leaf width min:

2 cm

Reproduction

The reproduction of Persicaria chinensis is characterized by the production of small, specialized fruits categorized as achenes. These fruits exhibit a specific size range, with a minimum length of 0.3 cm, a mean length of 0.35 cm, and a maximum length reaching up to 0.4 cm. In terms of fruit development and release, the fruit is indehiscent, meaning it does not spontaneously split open at maturity to release its seeds. The dispersal of the progeny follows a zoochorous syndrome, indicating that the plant relies on animals to facilitate the movement and distribution of its seeds within its environment.

Dehiscence :

indehiscent

Dispersal syndrome :

zoochorous

Fruit length max:

0.4 cm

Fruit length mean:

0.35 cm

Fruit length min:

0.3 cm

Fruit type :

achene

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Persicaria chinensis has 5 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Coumarins, METHYL GALLATE, N-E-FERULOYL TYRAMINE, caffeic acid, ellagic acid.

Coumarins

1. Bioorganic & medicinal chemistry letters

METHYL GALLATE

1. BMC complementary and alternative medicine

N-E-FERULOYL TYRAMINE

1. Bioorganic & medicinal chemistry letters

caffeic acid

1. BMC complementary and alternative medicine

ellagic acid

1. BMC complementary and alternative medicine

Activities

Persicaria chinensis has 2 reported activities identified across 0 scientific publications and several other databases. The most consistently reported activities include Antioxidant, Antitumor.

Antioxidant

1. Acta biochimica et biophysica Sinica

Antitumor

1. Acta biochimica et biophysica Sinica

Conditions

Persicaria chinensis has 1 reported investigations on conditions identified across 0 scientific publications and several other databases. The most consistently reported conditions include cervical cancer.

Cervical cancer

1. Acta biochimica et biophysica Sinica

Preparations

Persicaria chinensis has 1 reported preparations identified across 0 scientific publications and several other databases. The most consistently reported preparations include extract.

Extract

1. Plants (Basel, Switzerland)