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Acaena argentea
Acaena is a genus of about 100 species of mainly evergreen, creeping herbaceous perennial plants and subshrubs in the family Rosaceae.
Acaena It's native mainly to the Southern Hemisphere, notably New Zealand, Australia and South America, but with a few species extending into the Northern Hemisphere, north to Hawaii (A. exigua) and California (A. pinnatifida).
Thanks @Agustín Amenabar for ID.
Here's another spotting that looks like yours: http://www.projectnoah.org/spottings/806...