Acaena anserinifolia

About

Acaena anserinifolia, the bidibidi, hutiwai, or piripiri, is a species of plant, endemic to New Zealand. It has been introduced to the United Kingdom and Ireland. Known for its distinctive hooked seeds which easily attach to clothing and animals, bidibidi can be used to make a tea, used by both Māori and Pākehā settlers in New Zealand, as well as in ointments for wounds and medical purposes.

Summary from Wikipedia