Chemical Ecology / Flavonoids / Biological Sciences / Environmental Sciences / Brassicaceae / Density dependence / Population Density / North America / CHEMICAL SCIENCES / Invasive Plant / Plant extracts / Ecosystem / North American / Glucosinolates / Impatiens / Density dependence / Population Density / North America / CHEMICAL SCIENCES / Invasive Plant / Plant extracts / Ecosystem / North American / Glucosinolates / Impatiens