Hypericum ascyron

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Hypericum ascyron
Hypericum ascyron 0807.JPG
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Hypericaceae
Genus: Hypericum
Section: Hypericum sect. Roscyna
H. ascyron
Binomial name
Hypericum ascyron

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


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]


  1. ^ "Hypericum ascyron L." ipni.org. International Plant Names Index. Retrieved 2018-09-23.
  2. ^ "Hypericum ascyron". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 23 November 2015.
  3. ^ 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 eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. CS1 maint: discouraged parameter (link)
  4. ^ Missouri Botanical Garden Retrieved November 23, 2015
  5. ^ Wildflower Center Retrieved November 23, 2015
  6. ^ GoBotany: New England Retrieved November 23, 2015
  7. ^ "Hypericum ascyron L." Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 2018-09-23.
  8. ^ Illinois Flower Info Retrieved November 23, 2015
  9. ^ "Hypericum ascyron Descriptions". hypericum.myspecies.info. Retrieved 7 December 2018.