Hypericum perforatum
A flowering herb used for centuries in traditional medicine.
Hypericum perforatum, better known as St. John's wort (or perforate St. John's wort), is a flowering perennial in the Hypericaceae family. It has no hair on its stems or leaves, a woody root system, bright yellow flowers with black glands along the petal edges, and leaves that look like they have tiny holes because of translucent oil glands. A single plant can produce thousands of seeds.
This species is the type species for its genus and has a long history in folklore and traditional medicine. It is native to Europe and Asia, with a proposed hybrid origin between *Hypericum attenuatum* and *Hypericum maculatum* (imperforate St. John's wort), though this origin is not definitively pinned to Siberia. Because it is an allopolyploid, it can hybridize further with related species. From its native range—most of Europe, West and Central Asia, parts of Africa and China—it has spread across the globe. It thrives in well-drained, temperate spots like meadows, hillsides, and open woods with mild temperatures and moderate rainfall. Tough, toxic, and invasive, it reproduces both by seed and vegetatively, supports specialized insect herbivores, suffers from plant diseases, and causes ecological and agricultural problems in many regions.
For centuries, people have used St. John's wort medicinally, especially for wounds and depression. The oil can be extracted from its glands, or the above-ground parts can be dried and ground into a powder called *herba hyperici*. For mild to moderate depression, it shows antidepressant effects comparable to standard drugs but with fewer side effects, and it is approved for this use in the European Union. However, it can speed up the metabolism of various medications, leading to interactions.
**Description**
St. John's wort is a hairless perennial herb. Its root system is slender and woody, with many small fibrous side roots and creeping rhizomes. The main root reaches 0.6 to 1.5 meters deep, depending on conditions, and the root crown is woody. The erect stems branch near the top, grow 0.3 to 1 meter tall, and are woody at the base. They are rusty-yellow to rosy in color, have two distinct edges, and often shed bark near the base. Scars left by fallen leaves give the stems a jointed look. Stems survive the winter and produce flower buds the following year; first-year growth does not flower.
The leaves grow opposite each other without
- field
- Botany, Traditional Medicine
- known_for
- Antidepressant properties and use in folklore
- native_range
- Europe and Asia (including West and Central Asia, parts of Africa and China)
- chromosome_count
- 2n = 32
- seed_production
- 15,000 to 34,000 seeds per plant
Quick Facts
- Genus
- Hypericum
- Parent
- Hypericum sect. Hypericum
- Species
- perforatum
- Subdivision
- H. p. ssp. perforatum / H. p. ssp. songaricum(Ledeb. ex Rchb.) N.Robson / H. p. ssp. veronense(Ledeb. ex Rchb.) N.Robson / H. p. ssp. chinense(Schrank) H.Lindb.
Facts from the source article.
Lore & Background
Hypericum perforatum is a resilient, toxic, and invasive plant that reproduces sexually and vegetatively. It supports specialized insect herbivores, suffers from plant diseases, and poses ecological and agricultural threats in many parts of the world. The plant has been used for centuries in traditional medicine, especially for treating wounds and depression. To prepare it for use, the oil from its glands can be extracted or its above-ground parts can be dried and ground into a powder called herba hyperici. Its hybrid origin between *Hypericum attenuatum* and *Hypericum maculatum* has been proposed, but the exact geographic origin is not definitively established as Siberia.
Reader's Guide
Hypericum perforatum exhibits antidepressant effects comparable to drugs with fewer side effects for mild to moderate depression, for which it is approved in the European Union. However, it may interact with various medications by accelerating their metabolism. The most common active chemicals are hypericin, pseudohypericin, and hyperforin. The species is a hybrid between H. attenuatum and H. maculatum (imperforate St. John's wort) that originated in Siberia, and it can further hybridize with related species due to its allopolyploid nature. Its wide cosmopolitan distribution and prominence in folklore and medicine led to its selection as the type species of the genus Hypericum.
Did You Know?
- The leaves appear perforated due to translucent glands, visible when held up to light.
- Each plant may produce an average of 15,000 to 34,000 seeds.
- The species is a proposed hybrid between Hypericum attenuatum and Hypericum maculatum, but its origin is not definitively pinned to Siberia.
Frequently Asked Questions
What is Hypericum perforatum?
It is a flowering perennial herb in the Hypericaceae family, most widely recognized by its common name St. John's wort. As the type species of its genus, it has a long and well-documented history in both folklore and traditional medicine.
What does St. John's wort look like?
The plant has smooth, hairless stems and leaves, a woody root system, and clusters of bright yellow flowers marked with small black glands along the petal margins. Its leaves appear to be riddled with tiny pinholes, which are actually translucent oil glands visible against the light.
What is Hypericum perforatum most known for?
It is best recognized for its antidepressant properties and its centuries-long role in traditional herbal medicine. In European and Asian folklore, it was also revered as a protective herb believed to ward off evil spirits and misfortune.
Where does St. John's wort naturally grow?
The species is native to Europe and Asia, with established populations across West and Central Asia, parts of Africa, and China. It thrives as a hardy perennial in open, sunlit habitats.
How prolific is Hypericum perforatum as a seed producer?
A single mature plant can produce anywhere from 15,000 to 34,000 seeds, making it extraordinarily fertile. This massive seed output is a key reason the species spreads so aggressively in the wild.
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