About Erigeron glabellus Nutt.
Erigeron glabellus Nutt., commonly known as streamside fleabane, is a North American flowering plant species belonging to the Asteraceae family. It is widespread across much of the colder regions of western North America. In Canada, it has been recorded in Yukon, the Northwest Territories, British Columbia, all three Prairie Provinces, and Ontario. In the United States, it grows in Alaska, the northern section of the contiguous United States extending from Washington to Wisconsin, and along the Rocky Mountains as far south as Arizona and New Mexico. This species is distinguished from closely related species by its extremely narrow ray florets, which are sometimes reduced to thread-like strands. Erigeron glabellus is a perennial herb that grows up to 70 centimeters (28 inches) tall. Each stem sometimes produces only one flower head, and sometimes produces a cluster of up to 10 flower heads. Each head holds up to 175 white, pink, or blue ray florets, which surround numerous yellow disc florets. Two varieties are recognized: Erigeron glabellus var. glabellus, found in Alberta, Manitoba, Saskatchewan, Colorado, Idaho, Montana, New Mexico, Arizona, North Dakota, South Dakota, Utah, and Wyoming; and Erigeron glabellus var. pubescens Hooker, found in Alberta, British Columbia, Manitoba, Northwest Territories, Ontario, Saskatchewan, Yukon, Alaska, Colorado, Idaho, Minnesota, Montana, North Dakota, South Dakota, Wisconsin, and Wyoming.
