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Hypericum ascyron

Hypericum ascyron

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
Section: Hypericum sect. Roscyna
Species: Hypericum ascyron
Subspecies: H. a. subsp. ascyron – H. a. subsp. gleberi – H. a. subsp. pyramidatum

Hypericum ascyron L.

Hypericum ascyron Mill. = Hypericum calycinum L.


Ascyrum tetragonum Moench, Methodus: 130 (1794).
Ascyrum sibiricum Poir. in Lamarck, Tabl. Encycl. 3: 200 (1823).
Roscyna gmelinii Spach, Ann. Sci. Nat., Bot., sér. 2, 5: 364 (1836), nom. superfl.
Hypericum ascyron var. genuinum Maxim., Mém. Acad. Imp. Sci. St.-Pétersbourg Divers Savans 9: 65 (1859), not validly publ.

Native distribution areas:
Hypericum ascyron

Continental: Asia & Northern America
China (Anhui, Beijing, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hainan, Hebei, Heilongjiang, Henan, Hongkong, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Macao, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shandong, Shanghai, Shanxi, Sichuan, Tianjin, Xinjiang, Yunnan, Zhejiang); Taiwan; Japan (Hokkaido, Honshu, Kyushu); South China Sea Isl.; North Korea; South Korea; Vietnam; Siberia (W-Siberia, C-Siberia); Russian Far East; Mongolia. USA (Connecticut, Iowa, Illinois, Indiana, Kansas, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Vermont, Wisconsin, West Virginia); Canada (Ontario, Québec)

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
Primary references

Linnaeus, C. 1753. Species Plantarum. Tomus II: 783. Reference page.


Govaerts, R. et al. 2022. Hypericum ascyron in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2022 Jan 13. Reference page.
Hassler, M. 2022. World Plants. Synonymic Checklist and Distribution of the World Flora. . Hypericum ascyron. Accessed: 13 Jan 2022.
International Plant Names Index. 2022. Hypericum ascyron. Published online. Accessed: Jan 13 2022.
USDA, ARS, Germplasm Resources Information Network. Hypericum ascyron in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 08-Apr-12.

Vernacular names
azərbaycanca: İri dazı
беларуская: Голяма звъника
English: great St. Johnswort
日本語: トモエソウ
한국어: 물레나물
русский: Зверобой большой
українська: Звіробій великий
中文: 連翹, 湖南連翹, 黃海棠

Hypericum ascyron, the great St. Johnswort[2] or giant St. John's wort[3] is a flowering plant in the family Hypericaceae.

1 Description
2 Taxonomy
3 Distribution
4 References


This large species of Hypericum grows to be 3–5 feet tall. It is perennial and its leaves are a deep green, elliptic, and grow up to five inches long.[4] Its flowers have five petals and it can have thirteen or more stamens.[5][6]

Accepted infraspecifics include:[7]

Hypericum ascyron subsp. ascyron
Hypericum ascyron subsp. gebleri
Hypericum ascyron subsp. pyramidatum


It is found Asia and North America, in the latter primarily in the American Midwest, as well as parts of New England and Quebec.[8] It occurs in Russia, Mongolia, Korea, Taiwan, China, Vietnam, Canada, and the United States.[9]

"Hypericum ascyron L." International Plant Names Index. Retrieved 2018-09-23.
USDA, NRCS (n.d.). "Hypericum ascyron". The PLANTS Database ( Greensboro, North Carolina: National Plant Data Team. Retrieved 23 November 2015.
Robson, Norman K. B. "Hypericum ascyron". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). New York and Oxford. Retrieved 2018-09-23 – via, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Missouri Botanical Garden Retrieved November 23, 2015
Wildflower Center Retrieved November 23, 2015
GoBotany: New England Retrieved November 23, 2015
"Hypericum ascyron L." Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 2018-09-23.
Illinois Flower Info Retrieved November 23, 2015
"Hypericum ascyron Descriptions". Retrieved 7 December 2018.

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