Ray's Knotgrass vs Sea Knotgrass

Polygonum oxyspermum compared with Polygonum maritimum

Key Differences

• Ray's Knotgrass is Endangered while Sea Knotgrass is Not Evaluated.

Taxonomic Classification

Rank	Ray's Knotgrass	Sea Knotgrass
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order same	Caryophyllales (Caryophyllales)	Caryophyllales (Caryophyllales)
Family same	Polygonaceae	Polygonaceae
Genus same	Polygonum	Polygonum
Species	Polygonum oxyspermum	Polygonum maritimum

Evolutionary Relationship

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

Conservation Status

Ray's Knotgrass

EN — Endangered

Sea Knotgrass

NE — Not Evaluated

Physical Characteristics

Attribute	Ray's Knotgrass	Sea Knotgrass
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

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.

Sea Knotgrass

Habitat

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

Range

Distributed across Chile, India, and Portugal.