smooth white aster

Symphyotrichum porteri is a flowering plant species in the daisy family, Asteraceae. It is endemic to the U.S. states of Wyoming, Colorado, and New Mexico, where it grows in the foothills of the Rocky Mountains. The plant is herbaceous and perennial, with a height ranging from 10 to 50 cm. Its flowers have white or occasionally pinkish ray florets and yellow disk florets that change to pink and then brown as they mature. It is found at elevations between 1,800 and 2,900 meters. The species is considered Vulnerable (G3) at the global level and Critically Imperiled (S1) in Wyoming due to its limited range.