Square-stalked St John's-wort - Hypericum tetrapterum
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Species Description
Widespread and fairly common throughout the UK. Habitat includes: Damp places such as marshland, damp meadows, pond margins, stream / river sides, ditches etc. Flowers: June to September. Rhizomatous Perennial. Height: Up to 70 cm. Other names include: Peter-wort, Square St John's-Wort, Square-stemmed St John's-Wort, St Peter's-Wort.