Lake Huron tansy is a threatened plant of the coastal dunes, occurring on the northern shores of Lakes Michigan and Huron and the Lake Superior shoreline. This large headed tansy, which also occurs in northeastern North America, has lacy, hairy leaves and bright yellow, virtually ray less flower heads that emerge in mid to late summer. Like the common garden tansy, which can be distinguished by its much smaller flower heads and nonhairy leaves, all parts of the plant have a very characteristic pungent odor when crushed.