Ajuga vs Black Thistle

Ajuga reptans compared with Cirsium vulgare

Key Differences

• Ajuga is Endangered while Black Thistle is Least Concern.

Taxonomic Classification

Rank	Ajuga	Black Thistle
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order	Lamiales (Lamiales)	Asterales (Daisies & Sunflowers)
Family	Lamiaceae	Asteraceae (Daisy Family)
Genus	Ajuga	Cirsium
Species	Ajuga reptans	Cirsium vulgare

Evolutionary Relationship

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

Conservation Status

Ajuga

EN — Endangered

Black Thistle

LC — Least Concern

Physical Characteristics

Attribute	Ajuga	Black Thistle
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Ajuga

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, tundra, and tropical and subtropical moist broadleaf forests, among 11 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (South Africa), Asia (Japan), Europe (6 countries), North America (Canada, United States), Oceania and the Pacific (Australia, New Zealand), and South America (Brazil, Colombia). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Black Thistle

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical grasslands and savannas, and montane grasslands and shrublands, among 5 distinct biome types spanning the Afrotropic and Neotropic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (8 countries), Asia (Israel, Japan, Taiwan), Europe (12 countries), North America (5 countries), Oceania and the Pacific (Australia, New Zealand), and South America (7 countries).

Ajuga

The Ajuga (Ajuga reptans) is a species in the genus Ajuga. It is currently classified as Endangered on the IUCN Red List. Found across multiple habitat types including temperate broadleaf and mixed forests, tundra, and tropical and subtropical moist broadleaf forests, among 11 distinct biome types. Populations are also found in montane and highland environment.

Black Thistle

The Black Thistle (Cirsium vulgare) is a species in the genus Cirsium. It is currently classified as Least Concern on the IUCN Red List. Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical grasslands and savannas, and montane grasslands and shrublands, among 5 distinct biome types spanning the Afrotropic an, found across Argentina, Australia, Belgium, Bolivia, Brazil, and more.

Shared Countries

Both species can be found in 14 countries:

🇦🇺 Australia 🇧🇪 Belgium 🇧🇷 Brazil 🇨🇦 Canada 🇨🇴 Colombia 🇩🇰 Denmark 🇫🇮 Finland 🇯🇵 Japan 🇳🇿 New Zealand 🇳🇴 Norway 🇵🇹 Portugal 🇿🇦 South Africa 🇸🇪 Sweden 🇺🇸 United States