Hypericum perforatum

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Malpighiales

Familia: Hypericaceae
Genus: Hypericum
Sectio: H. sect. Hypericum
Subsectio: H. subsect. Hypericum
Series: H. ser. Hypericum
Species: Hypericum perforatum
Subspecies: H. p. subsp. chinense – H. p. subsp. perforatum – H. p. subsp. songaricum – H. p. subsp. veronense
Name

Hypericum perforatum L., Sp. Pl. 2: 785 (1753).
Synonyms

Homotypic
Hypericum officinale Gaterau, Desc. Pl. Montauban: 135 (1789), nom. illeg.
Hypericum officinarum Crantz, Stirp. Austr. Fasc. 2: 66 (1763), nom. illeg.
Hypericum vulgare Lam., Fl. Franç. 3: 151 (1779), nom. illeg.

Distribution
Native distribution areas:
References
Primary references

Linnaeus, C. 1753. Species Plantarum. Tomus II: 785. Reference page.

Links

Hassler, M. 2020. Hypericum perforatum. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2020. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2020 March 12. Reference page.
Govaerts, R. et al. 2020. Hypericum perforatum in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 March 12. Reference page.
International Plant Names Index. 2020. Hypericum perforatum. Published online. Accessed: 12 March 2020.

Vernacular names
العربية: نبتة سانت جونز, عرن مثقوب, St John's Wort
azərbaycanca: Adi dazı
башҡортса: Һары мәтрүшкә
беларуская: Святаяннік прадзіраўлены
български: Жълт кантарион
bosanski: Kantarion
català: Pericó, Herba de Sant Joan, Corassonillo, Pericó, Diablot
kaszëbsczi: Krziżewé drzéwkò
čeština: třezalka tečkovaná
Cymraeg: Eurinllys trydwll
dansk: Prikbladet Perikon, Prikbladet Pericon, Prikbladet perikum
Deutsch: Echtes Johanniskraut
Ελληνικά, Κυπριακά: Βάλσαμο, Ψιλλίνα
English: perforate St Joanswort, John's-wort, St John's wort
Esperanto: Trapunkta hiperiko, Hiperiko punktata, Hiperiko punktita
español: hierba de San Juan, hipérico, hipericón, corazoncillo, amnica, cientoenrama, corazón de ciervo, corión, espantadiablos, hierba del agua, hierba de la sangre, hierba de las heridas, hierba de las machacauras, hierba militar, hipericón oficinal, hipérico horadado, hipérico común, perforada, perforata, pericó, pericón, pericón amarillo, pericón común, pericón silvestre, perico, pericote, periquito, San Juan, sanjuanera, sanjuanes, san juanes, sanjuanines, té borde, trescalar, tresflorina, yerba de San Juan, yerbuca de San Juan
eesti: Liht-naistepuna
euskara: Santio belar
فارسی: چای کوهی, هزارچشم, علف چای, هوفاریقون, گل راعی
võro: Naistõpunahain
suomi: Mäkikuisma
arpetan: Lo Tê Sârvâjo, Tê Sârvâjo
français: Millepertuis perforé, Millepertuis officinal, Millepertuis perfore
Gaeilge: Beathnua
Gàidhlig: Eala bhuidhe, Achlaisean Chaluim Chille, Lus-Chaluim-Chille, Allas Chaluim Chille
galego: Herba de San Xoán, Abeloura
hrvatski: Kantarion, Gospina trava
hornjoserbsce: Dźěrkaty křižomnik, Twjerda trawa, Dźěrkawe łopješko, Swjatojanske zelo, Konjaca krej, Janske zelo, Lubozne zelo, Škerjedźiwe zelo, Dźěrkate janske zelo
magyar: Közönséges orbáncfű, lyukaslevelű orbáncfű
հայերեն: Սրոհունդ
íslenska: Jóhannesarjurt
italiano: Iperico perforato, Pilatro, Iperico
日本語: セント・ジョーンズ・ワート, セント・ジョンズ・ワート, セントジョーンズワート, セントジョーンズウォート, セントジョンズワート, セイヨウオトギリソウ, 西洋弟切草
Limburgs: Dónderkroed, Sint-Janskruid
lietuvių: Paprastoji jonažolė
latviešu: Divšķautņu asinszāle, Asinszāle
македонски: Жолт кантарион
norsk bokmål: Prikkperikum, Johannesurt, Johannes Urt
Nederlands: Sint-janskruid, Sintjanskruid, Sint Janskruid, St janskruid, St. Janskruid
norsk: Prikkperikum
ирон: Сауджыны тамако
polski: Dziurawiec zwyczajny, Dziurawiec pospolity
português: erva-de-são-joão, erva de São João, hipérico, hipericão
română: Sunătoare
русский: Зверобой продырявленный, Зверобой дырявый, Зверобойник, Заячья кровь, Зверобой жёлтый, Красная травица, Кровавец, Хворобой, Кровца, Зверобой обыкновенный
srpskohrvatski / српскохрватски: Kantarion, Kantarijon, Sentjanzovka, Gospino zelje, Bogorodična trava, Sentjanzevka
slovenčina: ̝ľubovník bodkovaný
slovenščina: Šentjanževka, Grilavec, Rumena naniknica, Krvočistnik, Janževka
српски / srpski: Kantarion, кантарион
svenska: Johannesört, Äkta Johannesört, Mansblod, Movina
тоҷикӣ: Чойкаҳак
Türkçe: Binbirdelik otu, Sarı kantaron
українська: Звіробій звичайний, Звіробій продірявлений
walon: Meytrô
中文（简体）: 贯叶连翘
中文（繁體）: 貫葉連翹
中文（臺灣）: 貫葉連翹
中文: 貫葉連翹, St John's wort

Hypericum perforatum, known as St. John's wort,[1] is a flowering plant in the family Hypericaceae and the type species of the genus Hypericum.

Possibly a hybrid between H. maculatum and H. attenuatum, the species can be found across temperate areas of Eurasia and has been introduced as an invasive weed to much of North and South America, as well as South Africa and Australia. While the species is harmful to livestock and can interfere with prescription drugs, it has been used in folk medicine over centuries, and remains commercially cultivated in the 21st century. Hyperforin, a phytochemical constituent of the species, is under basic research for its possible biological properties.

Description
Translucent dots of glandular tissue on the leaves

Perforate St John's wort is a herbaceous perennial plant with extensive, creeping rhizomes. Its reddish stems are erect and branched in the upper section, and can grow up to 1 m (3 ft 3 in) high. The stems are woody near their base and may appear jointed from leaf scars.[2] The branches are typically clustered about a depressed base. It has opposite and stalkless leaves that are narrow and oblong in shape and 1–2 cm (0.39–0.79 in) long.[3] Leaves borne on the branches subtend the shortened branchlets. The leaves are yellow-green in color, with scattered translucent dots of glandular tissue.[4] The dots are conspicuous when held up to the light, giving the leaves the "perforated" appearance to which the plant's Latin name refers. The flowers measure up to 2.5 cm (0.98 in) across, have five petals and sepals, and are colored bright yellow with conspicuous black dots.[5] The flowers appear in broad helicoid cymes at the ends of the upper branches, between late spring and early to mid-summer. The cymes are leafy and bear many flowers. The pointed sepals have black glandular dots. The many stamens are united at the base into three bundles. The pollen grains are ellipsoidal.[6] The black and lustrous seeds are rough, netted with coarse grooves.[7]

When flower buds (not the flowers themselves) or seed pods are crushed, a reddish or purple liquid is produced.[8]
Taxonomy
Etymology

The specific epithet perforatum is Latin, referring to the perforated appearance of the plant's leaves.[7]

The common name "St John's wort" may refer to any species of the genus Hypericum. Therefore, Hypericum perforatum is sometimes called "common St John's wort" or "perforate St John's wort" to differentiate it.

St John's wort is named as such because it commonly flowers, blossoms and is harvested at the time of the summer solstice in late June, around St John's Feast Day on 24 June. The herb would be hung on house and stall doors on St John's Feast day to ward off evil spirits and to safeguard against harm and sickness to people and live-stock. Alternatively, there may be a connection with the Knights Hospitaller. The genus name Hypericum is possibly derived from the Greek words hyper (above) and eikon (picture), in reference to the tradition of hanging plants over religious icons in the home during St John's Day.
Phylogeny

It is probable that Hypericum perforatum originated as a hybrid between two closely related species with subsequent doubling of chromosomes. One species is certainly a diploid a subspecies of Hypericum maculatum, either subspecies maculatum or immaculatum. Subspecies maculatum is similar in distribution and hybridizes easily with Hypericum perforatum, but subspecies immaculatum is more similar morphologically. The other parent is most likely Hypericum attenuatum as it possesses the features of Hypericum perforatum that Hypericum maculatum lacks. Though Hypericum maculatum is mostly western in its distribution across Eurasia and Hypericum attenuatum is mostly eastern, both species share distribution in Siberia, where hybridization likely took place. However, the subspecies immaculatum now only occurs in south-east Europe.[9]
Ecology

St John's wort reproduces both vegetatively and sexually. Depending on environmental and climatic conditions, and rosette age, St John's wort will alter growth form and habit to promote survival. Summer rains are particularly effective in allowing the plant to grow vegetatively, following defoliation by insects or grazing.[10] The seeds can persist for decades in the soil seed bank, germinating following disturbance.[11]
Distribution

Hypericum perforatum is native to temperate parts of Europe and Asia, but has spread to temperate regions worldwide as a cosmopolitan invasive weed.[12][13] It was introduced to North America from Europe.[14] The species thrives in areas with either a winter- or summer-dominant rainfall pattern; however, distribution is restricted by temperatures too low for seed germination or seedling survival.[12] Altitudes greater than 1500 m, rainfall less than 500 mm, and daily mean temperatures greater than 24 °C are considered limiting thresholds.[10]
Habitat

The flower occurs in prairies, pastures, and disturbed fields. It prefers sandy soils.[2]
Diseases

H. perforatum is affected by phytoplasma diseases, and when infected with Candidatus phytoplasma fraxini it undergoes several phytochemical changes and shows visible symptoms, including yellowing and witches' bloom symptoms. Naphthodianthrone, flavonoid, amentoflavone, and pseudohypericin levels are reduced; chlorogenic acid levels increased. Additionally, phytoplasma diseases greatly reduced the essential oil yield of the plant.[15]
Invasiveness

Although Hypericum perforatum is grown commercially in some regions of southeast Europe, it is listed as a noxious weed in more than twenty countries and has introduced populations in South and North America, India, New Zealand, Australia, and South Africa.[12][11] In pastures, St John's wort acts as both a toxic and invasive weed. It replaces native plant communities and forage vegetation to the extent of making productive land nonviable or becoming an invasive species in natural habitats and ecosystems.[16] Ingestion by livestock such as horses, sheep, and cattle can cause photosensitization, central nervous system depression, spontaneous abortion, or death.[16][17] Effective herbicides for control of Hypericum perforatum include 2,4-D, picloram, and glyphosate. In western North America the beetles Chrysolina quadrigemina, C. hyperici, and Agrilus hyperici have been introduced as biocontrol agents.[18]

Traditional medicine

Common St John's wort has been used in herbalism for centuries.[19][20] It was thought to have medical properties in classical antiquity and was a standard component of theriacs, from the Mithridate of Aulus Cornelius Celsus' De Medicina (c. 30 CE) to the Venice treacle of d'Amsterdammer Apotheek in 1686. Folk usages included oily extract (St John's oil) and Hypericum snaps. Hypericum perforatum is a common species and is grown commercially for use in herbalism and traditional medicine.[20]

The red, oily extract of H. perforatum has been used in the treatment of wounds, including by the Knights Hospitaller, the Order of St John.[19][21] Both hypericin and hyperforin are under study for their potential antibiotic properties.[22]
Medical research
Antidepressant
Further information: Hyperforin

A 2015 meta-analysis review concluded that it has superior efficacy to placebo in treating depression, is as effective as standard antidepressant pharmaceuticals for treating depression, and has fewer adverse effects than other antidepressants.[23] The authors concluded that it is difficult to assign a place for St. John's wort in the treatment of depression owing to limitations in the available evidence base, including large variations in efficacy seen in trials performed in German-speaking relative to other countries. In Germany, St. John's wort may be prescribed for mild to moderate depression, especially in children and adolescents.[24] A 2008 Cochrane review of 29 clinical trials concluded that it was superior to placebo in patients with major depression, as effective as standard antidepressants and had fewer side-effects.[25] A 2016 review noted that use of St. John's wort for mild and moderate depression was better than placebo for improving depression symptoms, and comparable to antidepressant medication.[26] A 2017 meta-analysis found that St. John's wort had comparable efficacy and safety to SSRIs for mild-to-moderate depression and a lower discontinuation rate.[27]

While some studies and research reviews have supported the efficacy of St John's wort as a treatment for depression in humans, in the United States, it is not recommended as a replacement for more studied treatments, and it is advised that symptoms of depression warrant proper medical consultation.[19]

In the United States, St John's wort is considered a dietary supplement by the FDA, and is not regulated by the same standards as a prescription drug.[28][29] According to the United States National Center for Complementary and Integrative Health, St. John's wort appears to be more effective than placebo and as effective as standard antidepressant medications for mild and moderate depression, and that it is uncertain whether this is true for severe depression or for longer than 12 weeks.[19] Supplement strength varies by manufacturer and possibly by batch.[30] With antidepressants, one "may have to try a few before finding what works best," notes the United States National Library of Medicine.[31]
Phytochemicals and dietary supplement

St John's wort, similarly to other herbs, contains different phytochemical constituents.[32][33][34] Although St. John's wort is sold as a dietary supplement, there are no standardized manufacturing procedures, and some marketed products may be contaminated with metals, fillers or other impurities.[20]
Comparison of selected chemical constituents of Hypericum perforatum[32][35]
Side effects

St John's wort may cause allergic reactions and can interact in dangerous, sometimes life-threatening ways with a variety of prescribed medicines.[20][19] St John's wort is generally well tolerated, but it may cause gastrointestinal discomfort (such as nausea, abdominal pain, loss of appetite, and diarrhea), dizziness, confusion, fatigue, sedation, dry mouth, restlessness, headache and hypertension.[20][38][39][40][41][36]

The organ systems associated with adverse drug reactions to St John's wort and fluoxetine (an SSRI) have a similar incidence profile;[42] most of these reactions involve the central nervous system.[42] St John's wort also decreases levels of estrogens, such as estradiol, by accelerating its metabolism, and women on contraceptive pills are not advised to take it.[19] St John's wort may cause photosensitivity. This can lead to visual sensitivity to visible and ultraviolet light and to sunburns in situations that would not normally cause them.[38]
Interactions

St John's wort can interfere with the effects of many prescription drugs,[19][20] including the anti-psychotics risperidone and 9-hydroxyrisperidone (i.e. paliperidone, Xeplion or Invega),[43][44] cyclosporine, digoxin, HIV drugs, cancer medications including irinotecan, and warfarin.[19][20] Combining both St John's wort and antidepressants could lead to increased serotonin levels causing serotonin syndrome.[45] It should not be taken with the heart medication ranolazine.[46] Combining estrogen-containing oral contraceptives with St John's wort can lead to decreased efficacy of the contraceptive and, potentially, unplanned pregnancies.[47] Consumption of St John's wort is discouraged for those with bipolar disorder, schizophrenia or dementia, and for people using dietary supplements, headache medicine, anticoagulants, and birth control pills.[19][20]
Pharmacodynamics

St John's wort has been shown to cause multiple drug interactions through induction of the cytochrome P450 enzymes CYP3A4 and CYP1A2. This drug-metabolizing enzyme induction results in the increased metabolism of certain drugs, leading to decreased plasma concentration and potential clinical effect.[48] The principal constituents thought to be responsible are hyperforin and amentoflavone. There is strong evidence that the mechanism of action of these interactions is activation of the pregnane X receptor.[49]

St John's wort has also been shown to cause drug interactions through the induction of the P-glycoprotein efflux transporter. Increased P-glycoprotein expression results in decreased absorption and increased clearance of certain drugs, leading to lower plasma concentrations and impaired clinical efficacy.[44]
Examples of drugs whose effectiveness may be reduced by St. John's wort Class Drugs
Antiretrovirals Non-nucleoside reverse transcriptase inhibitors, protease inhibitors
Benzodiazepines Alprazolam, midazolam
Hormonal contraception Combined oral contraceptives
Immunosuppressants Calcineurin inhibitors, cyclosporine, tacrolimus
Antiarrhythmics Amiodarone, flecainide, mexiletine
Beta-blockers Metoprolol, carvedilol
Calcium channel blockers Verapamil, diltiazem, amlodipine, pregabalin
Statins (cholesterol-reducing medications) Lovastatin, simvastatin, atorvastatin
Others Digoxin, methadone, omeprazole, phenobarbital, theophylline, warfarin, levodopa, buprenorphine, irinotecan, risperidone, paliperidone
Reference: Rossi, 2005; Micromedex
Livestock poisoning

In large doses, St John's wort is poisonous to grazing livestock.[16] Behavioral signs of poisoning are general restlessness and skin irritation. Restlessness is often indicated by pawing of the ground, headshaking, head rubbing, and occasional hindlimb weakness with knuckling over, panting, confusion, and depression. Mania and hyperactivity may also result, including running in circles until exhausted. Observations of thick wort infestations by Australian grazers include the appearance of circular patches giving hillsides a "crop circle" appearance, it is presumed, from this phenomenon. Animals typically seek shade and have reduced appetites. Hypersensitivity to water has been noted, and convulsions may occur following a knock to the head. Although general aversion to water is noted, some may seek water for relief.

Severe skin irritation is physically apparent, with reddening of non-pigmented and unprotected areas. This subsequently leads to itch and rubbing, followed by further inflammation, exudation, and scab formation. Lesions and inflammation that occur are said to resemble the conditions seen in foot and mouth disease. Sheep have been observed to have face swelling, dermatitis, and wool falling off due to rubbing. Lactating animals may cease or have reduced milk production; pregnant animals may abort. Lesions on udders are often apparent. Horses may show signs of anorexia, depression (with a comatose state), dilated pupils, and injected conjunctiva.
Diagnosis

Increased respiration and heart rate is typically observed while one of the early signs of St John's wort poisoning is an abnormal increase in body temperature. Affected animals will lose weight, or fail to gain weight; young animals are more affected than old animals. In severe cases death may occur, as a direct result of starvation, or because of secondary disease or septicaemia of lesions. Some affected animals may accidentally drown. Poor performance of suckling lambs (pigmented and non-pigmented) has been noted, suggesting a reduction in milk production, or the transmission of a toxin in the milk. It may result in an undesirable flavor.[50]
Photosensitisation

Most clinical signs in animals are caused by photosensitisation.[51] Plants may induce either primary or secondary photosensitisation:

primary photosensitisation directly from chemicals contained in ingested plants
secondary photosensitisation from plant-associated damage to the liver.

Araya and Ford (1981) explored changes in liver function and concluded there was no evidence of Hypericum-related effect on the excretory capacity of the liver, or any interference was minimal and temporary. However, evidence of liver damage in blood plasma has been found at high and long rates of dosage.

Photosensitisation causes skin inflammation by a mechanism involving a pigment or photodynamic compound, which when activated by a certain wavelength of light leads to oxidation reactions in vivo. This leads to tissue lesions, particularly noticeable on and around parts of skin exposed to light. Lightly covered or poorly pigmented areas are most conspicuous. Removal of affected animals from sunlight results in reduced symptoms of poisoning.
Chemistry
Detection in body fluids

Hypericin, pseudohypericin, and hyperforin may be quantitated in plasma as confirmation of usage and to estimate the dosage. These three active substituents have plasma elimination half-lives within a range of 15–60 hours in humans. None of the three has been detected in urine specimens.[52]
Chemical constituents
Chemical structure of hypericin

The plant contains the following:[32][36]

Flavonoids (e.g. epigallocatechin, rutin, hyperoside, isoquercetin, quercitrin, quercetin, amentoflavone, biapigenin, astilbin, myricetin, miquelianin, kaempferol, luteolin)
Phenolic acids (e.g. chlorogenic acid, caffeic acid, p-coumaric acid, ferulic acid, p-hydroxybenzoic acid, vanillic acid)
Naphthodianthrones (e.g. hypericin, pseudohypericin, protohypericin, protopseudohypericin)
Phloroglucinols (e.g. hyperforin, adhyperforin)
Tannins (unspecified, proanthocyanidins reported)
Volatile oils (e.g. 2-methyloctane, nonane, 2-methyldecane, undecane, α-pinene, β-pinene, α-terpineol, geraniol, myrcene, limonene, caryophyllene, humulene)
Saturated fatty acids (e.g. isovaleric acid (3-methylbutanoic acid), myristic acid, palmitic acid, stearic acid)
Alkanols (e.g. 1-tetracosanol, 1-hexacosanol)
Vitamins & their analogues (e.g. carotenoids, choline, nicotinamide, nicotinic acid)
Miscellaneous others (e.g. pectin, β-sitosterol, hexadecane, triacontane, kielcorin, norathyriol)

The naphthodianthrones hypericin and pseudohypericin along with the phloroglucinol derivative hyperforin are thought to be among the numerous active constituents.[6][53][54][55] It also contains essential oils composed mainly of sesquiterpenes.[6]
Selected chemical constituents of Hypericum perforatum
See also

Dietary supplement
EU Food supplements directive
List of plants poisonous to equines
St John's-bread

Notes
References

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