Hypericum tetrapterum
| Hypericum tetrapterum | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae | 
| Clade: | Tracheophytes | 
| Clade: | Angiosperms | 
| Clade: | Eudicots | 
| Clade: | Rosids | 
| Order: | Malpighiales | 
| Family: | Hypericaceae | 
| Genus: | Hypericum | 
| Section: | Hypericum sect. Hypericum | 
| Subsection: | Hypericum subsect. Hypericum | 
| Series: | Hypericum ser. Hypericum | 
| Species: | H. tetrapterum | 
| Binomial name | |
| Hypericum tetrapterum | |
| Synonyms | |
| 
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Hypericum tetrapterum (syn. H. quadrangulum) is a herbaceous perennial plant species in the flowering plant family Hypericaceae. Its common names include St. Peter's wort, Peterwort, square stemmed St. John's wort, and square stalked St. John's wort.