Square-stalked St John's-wort

Hypericum tetrapterum

Hypericum tetrapterum 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.

Scientific name

Hypericum tetrapterum

Family

Hypericaceae