Ajuga vs Common St. John'S Wort

Ajuga reptans compared with Hypericum perforatum

Key Differences

• Ajuga is Endangered while Common St. John'S Wort is Least Concern.

Taxonomic Classification

Rank	Ajuga	Common St. John'S Wort
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order	Lamiales (Lamiales)	Malpighiales (Malpighiales)
Family	Lamiaceae	Hypericaceae
Genus	Ajuga	Hypericum
Species	Ajuga reptans	Hypericum perforatum

Evolutionary Relationship

Ajuga and Common St. John'S Wort share a common ancestor at the Class level: Magnoliopsida. (Dicots)

Conservation Status

Ajuga

EN — Endangered

Common St. John'S Wort

LC — Least Concern

Physical Characteristics

Attribute	Ajuga	Common St. John'S Wort
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.

Common St. John'S Wort

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, montane grasslands and shrublands, and deserts and xeric shrublands spanning the Afrotropic and Palearctic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (5 countries), Europe (8 countries), North America (Canada, United States), Oceania and the Pacific (Australia, New Zealand), and South America (Argentina, Brazil, Chile).

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.

Common St. John'S Wort

<em>Hypericum perforatum</em>, commonly known as common St. John's wort, is a flowering plant in the family Hypericaceae, order Malpighiales. It enjoys a cosmopolitan distribution, naturally occurring across Europe, western Asia, and North Africa, and has become widely naturalized in North and South America, Australia, and parts of Asia. The species typically inhabits roadsides, meadows, disturbed ground, and open woodland edges, preferring well-drained soils and full sun to partial shade. Its bright yellow flowers, distinguished by black glandular dots along the margins, bloom from late spring through summer. <em>Hypericum perforatum</em> has long been used in herbal medicine, particularly for its antidepressant properties attributed to the compound hypericin. The plant is also known to cause photosensitivity in livestock when ingested in large quantities. Biological traits including precise lifespan, reproductive output rates, and specific dietary associations remain poorly documented at the species level. Its conservation status is Least Concern, and it is considered a common weed in many regions, indicating a stable and widespread global population.

Shared Countries

Both species can be found in 12 countries:

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