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

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

Description

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. Its flowers have five petals and it can have thirteen or more stamens.

Taxonomy

Accepted infraspecifics include:

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

Distribution

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

References

1. "Hypericum ascyron L." ipni.org. International Plant Names Index. Retrieved 2018-09-23.
2. NRCS. "Hypericum ascyron". PLANTS Database. United States Department of Agriculture (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: Oxford University Press. Retrieved 2018-09-23 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
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.

• Hypericum
• Flora of Northern America