Common St. John'S Wort vs Cracked Saint John's Wort

Hypericum perforatum compared with Hypericum fissurale

Key Differences

• Common St. John'S Wort is Least Concern while Cracked Saint John's Wort is Critically Endangered.

Taxonomic Classification

Rank	Common St. John'S Wort	Cracked Saint John's Wort
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order same	Malpighiales (Malpighiales)	Malpighiales (Malpighiales)
Family same	Hypericaceae	Hypericaceae
Genus same	Hypericum	Hypericum
Species	Hypericum perforatum	Hypericum fissurale

Evolutionary Relationship

Common St. John'S Wort and Cracked Saint John's Wort share a common ancestor at the Genus level: Hypericum.

Conservation Status

Common St. John'S Wort

LC — Least Concern

Cracked Saint John's Wort

CR — Critically Endangered

Physical Characteristics

Attribute	Common St. John'S Wort	Cracked Saint John's Wort
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic 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).

Cracked Saint John's Wort

Habitat

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

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.