| 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 | |
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 (0.9–1.5 m) tall. It is perennial and its leaves are a deep green, elliptic, and grow up to 5 inches (13 cm) long. [4] Its flowers have five petals and it can have thirteen or more stamens. [5] [6]
Accepted infraspecifics include: [7]
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]