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If only the article had mentioned the Latin name of the plant. Wikipedia gives four possibilities: https://en.wikipedia.org/wiki/Sweet_grass

Both possibilities mentioned to be native to America seem to have coumarin. Since this is what repels the mosquitoes perhaps it was irrelevant.

Hierochloe odorata

There is a lot of plants with coumarin in fact, not ony weeds.

Good to know, thanks.