slender knotweed

Names and Synonyms

Common Names

• slender knotweed
• willow-weed
• Tutunawai
• swamp willow weed

Scientific Names

Accepted name

Synonyms

• Polygonum minus subsp. decipiens
• Polygonum salicifolium var. serrulatum
• Polygonum serrulatum var. albiflorum
• Polygonum serrulatoides var. pseudohydropiper
• Polygonum decipiens
• Polygonum flaccidum
• Polygonum azoricum
• Polygonum adoense
• Polygonum abyssinicum
• Polygonum serrulatum var. bequaertii
• Polygonum serrulatum var. angustifolium
• Polygonum serrulatum var. salicifolium
• Persicaria salicifolia subsp. mambillensis
• Polygonum serrulatum f. polystachyum
• Persicaria serrulata
• Polygonum mite subsp. serrulatum
• Persicaria minor subsp. decipiens
• Polygonum scabrum var. salicifolium
• Polygonum erythropus
• Polygonum macrochaetum
• Polygonum leuconeuron
• Polygonum serrulatum
• Polygonum serrulatoides
• Persicaria serrulata var. asiatica

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae within the phylum Streptophyta and the class Equisetopsida. It is further classified under the subclass Magnoliidae and the order Caryophyllales. Finally, it resides in the family Polygonaceae and is identified by the genus Persicaria.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a specific distribution pattern centered primarily within the Mediterranean region of Southwestern Europe. Its presence is recorded across several key island territories, including the Baleares, Corse, and Sardegna. Beyond these islands, the species can also be found on the mainland in France. Additionally, the plant extends its range southward into the coastal areas of Portugal. Collectively, these locations highlight a localized geographical footprint within the southwestern European landscape.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Persicaria decipiens is characterized by a broad altitudinal distribution, allowing it to colonize a diverse range of environments across varying topographic gradients. It is found at elevations ranging from sea level (0 m AMSL) up to a maximum height of 2135 m AMSL. This extensive elevational range suggests a high degree of ecological plasticity, enabling the species to adapt to both lowland tropical or subtropical conditions and higher-altitude montane habitats. Such a wide vertical niche indicates that the plant can withstand fluctuations in temperature, atmospheric pressure, and moisture availability inherent in transitioning from coastal or valley floor ecosystems to mid-elevation montane zones.

Elevational range max:

2135 m AMSL

Elevational range min:

0 m AMSL

Life history

The life history of Persicaria decipiens is characterized by a variable lifecycle that can manifest as an annual, biennial, or perennial, allowing it to adapt to fluctuating environmental conditions. In terms of its biological structure and growth strategy, the plant exhibits diverse life forms depending on its ecological niche; it functions as a helophyte, thriving in transitional habitats between terrestrial and aquatic environments, while also displaying traits of a therophyte, completing its life cycle through rapid seasonal growth and seed production.

Life form :

helophyte

Life form :

therophyte

Lifecycle :

perennial

Morphology

The morphology of Persicaria decipiens is characterized by its growth form as a non-woody herb. The plant is primarily terrestrial in its habitat and functions as a self-supporting organism rather than a climber or vine. It maintains an independent life cycle, functioning as a non-parasitic species. In terms of stature, it exhibits significant variability in plant height, with minimum measurements recorded at 0.2 m, a mean height of approximately 0.55 m, and a maximum height reaching up to 1.219214826 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Parasite :

independent

Plant height max:

1.219214826 m

Plant height mean:

0.55 m

Plant height min:

0.2 m

Woodiness :

non-woody

Physiology

The physiology of Persicaria decipiens is characterized by specific morphological parameters and metabolic capabilities that define its vegetative growth. The plant's photosynthetic surface is provided by leaves that exhibit an elliptic form, varying in dimensions to optimize light interception. These leaves typically possess a minimum length of 5 cm and can reach a maximum length of 12 cm, while their width ranges from a narrow 0.5 cm to a maximum of 2 cm. From a metabolic standpoint, the plant does not function as a nitrogen fixer, meaning it lacks the symbiotic relationship with nitrogen-fixing bacteria required to convert atmospheric nitrogen into a usable form, and instead relies on the uptake of available nitrates and ammonium from the soil to support its physiological processes.

Leaf form :

elliptic

Leaf length max:

12 cm

Leaf length min:

5 cm

Leaf width max:

2 cm

Leaf width min:

0.5 cm

Nitrogen fixer :

no

Reproduction

The reproduction of Persicaria decipiens is characterized by the production of small, pink flowers arranged in a panicle inflorescence. These flowers typically measure between 0.25 cm and 0.3 cm in length and appear during a flowering season that begins in April and concludes in July. Following pollination, the plant develops fruits categorized as achenes, which range in length from 0.2 cm to a maximum of 0.3 cm. These fruits are indehiscent, meaning they do not split open at maturity to release their contents. The resulting seeds are exceptionally lightweight, with a mean seed mass of 0.00103 g, falling within a narrow range of 0.00099 g to 0.00107 g.

Dehiscence :

indehiscent

Flower colour :

pink

Flower length max:

0.3 cm

Flower length min:

0.25 cm

Flowering time :

Apr

Flowering time :

Jul

Fruit length max:

0.3 cm

Fruit length min:

0.2 cm

Fruit type :

achene

Inflorescence :

panicle

Seed mass max:

0.00107 g

Seed mass mean:

0.00103 g

Seed mass min:

0.00099 g

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Persicaria decipiens has 3 reported plant parts identified across 8 scientific publications and several other databases that are studied for medicinal purposes. The most consistently reported plant part include leaf, stem, root.

Leaf

1. Molecules (Basel, Switzerland)
2. PeerJ
3. Regulatory toxicology and pharmacology : RTP

Stem

1. Scientific reports
2. Molecules (Basel, Switzerland)
3. Plants (Basel, Switzerland)

Root

1. Molecules (Basel, Switzerland)
2. PeerJ

Chemicals

Persicaria decipiens has 20 reported phytochemicals identified across 8 scientific publications and several other databases. The most consistently reported chemicals include polygonumins A, CHLOROPHYLL, CHLOROPHYLL B, Carotenoids, DODECANAL.

polygonumins A

1. Scientific reports
2. Plants (Basel, Switzerland)

CHLOROPHYLL

1. Malaysian journal of nutrition

CHLOROPHYLL B

1. Plants (Basel, Switzerland)

Carotenoids

1. Malaysian journal of nutrition

DODECANAL

1. Molecules (Basel, Switzerland)

Decanal

1. Molecules (Basel, Switzerland)

Flavonoids

1. PeerJ

Monoterpenes

1. Journal of plant physiology

PGA

1. The Journal of pharmacy and pharmacology

Polygonumins B

1. Plants (Basel, Switzerland)

Activities

Persicaria decipiens has 6 reported activities identified across 8 scientific publications and several other databases. The most consistently reported activities include Antimicrobial, Antioxidant, Anticancer, Anticholinesterase, Anthelmintic.

Antimicrobial

1. Molecules (Basel, Switzerland)
2. Plants (Basel, Switzerland)
3. Data in brief

Antioxidant

1. Molecules (Basel, Switzerland)
2. Plants (Basel, Switzerland)
3. Data in brief

Anticancer

1. Plants (Basel, Switzerland)
2. Data in brief

Anticholinesterase

1. Molecules (Basel, Switzerland)
2. Plants (Basel, Switzerland)

Anthelmintic

1. The Journal of pharmacy and pharmacology

Antiproliferative

1. Scientific reports

Preparations