Spermacoce remota
[Purple-leaved Buttonweed, Woodland False Buttonweed]

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This herbaceous plant seems to have been incorrectly named as Spermacoce laevis, Borreria laevis and Borreria verticillata in the past according to the Cook Islands Biodiversity Database. Since Spermacoce assurgens is now considered as a synonym of Spermacoce remota based on the information from the Plant List website, I have used this name.