Purple Loosestrife (2 of 2) (IMAGE)

Harvard University

Purple Loosestrife (2 of 2)

Caption

Purple loosestrife is one of the worst invasive plant species in the northeastern United States, and has exhibited a remarkably favorable response to climate change. It now flowers three weeks earlier since the time of Thoreau. In many wetland areas it has crowded out native vegetation and competes for local pollinators like this monarch butterfly in the area of Concord, Mass.

Credit

Abraham Miller-Rushing

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