Prostrate knotweed vs Ray's Knotgrass

Polygonum aviculare compared with Polygonum oxyspermum

Key Differences

• Prostrate knotweed is Not Evaluated while Ray's Knotgrass is Endangered.

Taxonomic Classification

Rank	Prostrate knotweed	Ray's Knotgrass
Kingdom same	Plantae (식물)	Plantae (식물)
Phylum same	Magnoliophyta (피자식물문)	Magnoliophyta (피자식물문)
Class same	Magnoliopsida (목련강)	Magnoliopsida (목련강)
Order same	Caryophyllales (석죽목)	Caryophyllales (석죽목)
Family same	Polygonaceae	Polygonaceae
Genus same	Polygonum	Polygonum
Species	Polygonum aviculare	Polygonum oxyspermum

Evolutionary Relationship

Prostrate knotweed and Ray's Knotgrass share a common ancestor at the Genus level: Polygonum.

Conservation Status

Prostrate knotweed

NE — Not Evaluated

Ray's Knotgrass

EN — Endangered

Physical Characteristics

Attribute	Prostrate knotweed	Ray's Knotgrass
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Prostrate knotweed

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Widely distributed across Africa (9 countries), Asia (8 countries), Europe (11 countries), North America (6 countries), Oceania and the Pacific (Australia, Solomon Islands), and South America (7 countries).

Ray's Knotgrass

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Distributed across Denmark, Norway, and Sweden. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden