Bloodwort vs Common knotweed

Achillea millefolium compared with Polygonum plebeium

Key Differences

• Bloodwort is Least Concern while Common knotweed is Not Evaluated.

Taxonomic Classification

Rank	Bloodwort	Common knotweed
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order	Asterales (Daisies & Sunflowers)	Caryophyllales (Caryophyllales)
Family	Asteraceae (Daisy Family)	Polygonaceae
Genus	Achillea	Polygonum
Species	Achillea millefolium	Polygonum plebeium

Evolutionary Relationship

Bloodwort and Common knotweed share a common ancestor at the Class level: Magnoliopsida. (Dicots)

Conservation Status

Bloodwort

LC — Least Concern

Common knotweed

NE — Not Evaluated

Physical Characteristics

Attribute	Bloodwort	Common knotweed
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bloodwort

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and flooded grasslands and savannas, among 11 distinct biome types spanning the Indomalayan and Neotropic and Palearctic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (South Africa), Asia (4 countries), Europe (10 countries), North America (5 countries), Oceania and the Pacific (Australia), and South America (4 countries).

Common knotweed

Habitat

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

Range

Widely distributed across Africa (Madagascar), Asia (Japan, Taiwan), Europe (5 countries), and North America (United States).

Bloodwort

The Bloodwort (Achillea millefolium) is a species in the genus Achillea. It is currently classified as Least Concern on the IUCN Red List. Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and flooded grasslands and savannas, among 11 distinct biome types spanning the Indomalayan and Neotropic and Palearctic real

Common knotweed

Common Knotweed (<em>Polygonum plebeium</em>) is a low-growing annual herb in the family Polygonaceae, widely distributed across Africa, Asia, Europe, and North America. Its native range includes Madagascar in Africa, Japan and Taiwan in Asia, five European countries, and the United States in North America. The species typically inhabits diverse terrestrial environments including roadsides, cultivated fields, waste ground, and disturbed habitats, often thriving in compacted or trampled soils. It is a small, mat-forming plant with tiny pink or white flowers and narrow leaves, well adapted to anthropogenic landscapes. Its conservation status has not been formally evaluated by the IUCN. The broad distributional range and generalist habitat preferences of this species suggest resilience to moderate levels of disturbance, though its ecological role in native plant communities is less well characterized compared to its weedy occurrences in disturbed sites. Biological traits of this species remain poorly documented in the scientific literature.

Shared Countries

Both species can be found in 6 countries:

🇧🇪 Belgium 🇫🇷 France 🇯🇵 Japan 🇸🇪 Sweden 🇹🇼 Taiwan 🇺🇸 United States