Dame's rocket (Hesperis matronalis L.)

Dame's rocket was originally brought in as an ornamental plant that has escaped and become invasive in Sublette County, specifically in Bondurant. 

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Dame's rocket has an aggressive root system and is a prolific seed producer, because of this it can produce large stands quickly. This plant is a short lived perennial growing up to 4 feet tall, it has alternate, lance shaped leaves with toothed margins. The flowers are purple to white with four petals.