Bur reed

From Great Lakes Wiki

A plant that is considered a noxious weed {poisonous} in most states, The Bur reed has long ribbon like leaves and produces burs that latch onto to mammals in order to spread and re-produce. It forms densely in marsh lands and can outcompete natives like cattails

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Image from-www.biosurvey.ou.edu/okwild/bur.html