Black Knapweed vs Castor

Centaurea nigra compared with Ricinus communis

Taxonomic Classification

Rank	Black Knapweed	Castor
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order	Asterales (Daisies & Sunflowers)	Malpighiales (Malpighiales)
Family	Asteraceae (Daisy Family)	Euphorbiaceae
Genus	Centaurea	Ricinus
Species	Centaurea nigra	Ricinus communis

Evolutionary Relationship

Black Knapweed and Castor share a common ancestor at the Class level: Magnoliopsida. (Dicots)

Conservation Status

Black Knapweed

NE — Not Evaluated

Castor

NE — Not Evaluated

Physical Characteristics

Attribute	Black Knapweed	Castor
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black Knapweed

Habitat

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

Range

Widely distributed across Asia (Japan), Europe (7 countries), North America (Canada, United States), Oceania and the Pacific (Australia), and South America (Chile).

Castor

Habitat

Found across multiple habitat types including tropical and subtropical dry broadleaf forests, flooded grasslands and savannas, and montane grasslands and shrublands, among 7 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (33 countries), Asia (26 countries), Europe (23 countries), North America (15 countries), Oceania and the Pacific (14 countries), and South America (12 countries).

Black Knapweed

The Black Knapweed (Centaurea nigra) is a species in the genus Centaurea. Typically found in diverse terrestrial habitats from tropical forests to temperate regions. Its geographic range spans Widely distributed across Asia (Japan), Europe (7 countries), North America (Canada, United States), Oceania and the Pacific (Australia), and South America (Chile).

Castor

The Castor (Ricinus communis) is a species in the genus Ricinus. Found across multiple habitat types including tropical and subtropical dry broadleaf forests, flooded grasslands and savannas, and montane grasslands and shrublands, among 7 distinct biome types. Populations are also found in montane and hi

Shared Countries

Both species can be found in 10 countries:

🇦🇺 Australia 🇦🇹 Austria 🇨🇱 Chile 🇨🇿 Czech Republic 🇩🇰 Denmark 🇫🇷 France 🇯🇵 Japan 🇳🇴 Norway 🇸🇪 Sweden 🇺🇸 United States