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ʻakauveli — añil indigo

Indigofera suffruticosa

Another unwanted plant, introduced to Tonga from tropical America, probably by the missionaries in the 19th century. Perhaps they had ideas to extract the nice indigo paint from the plant, but that was never done in Tonga. Growing quickly in deserted areas and seeding abundantly.

For more information see Pacific Island Ecosystems at Risk.

Or look in the Tongan Wikipedia.