Eurybia sibirica

Eurybia sibirica, commonly known as the Siberian aster or arctic aster, is an herbaceous perennial native to north western North America and northern Eurasia. It is found largely in open areas of subarctic boreal forests, though it is also found in a wide variety of habitats in the region. It is similar in appearance to Eurybia merita, but their ranges overlap only near the border between the US and Canada, where E. sibirica is generally found at higher elevations. Eurybia sibirica is a perennial herb up to 60 cm (2 feet) tall, spreading by means of thin underground rhizomes. The plant produces flower heads either one at a time or in dense flat-topped arrays of 2–50 heads. Each head contains 12–50 white, purple, or pale violet ray florets surrounding 25–125 yellow disc florets. The involucral bracts are reddish-purple (anthocyanic)....read more on Wikipedia.