Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
Lactuca muralis of Michigan Flora.
An invader from Europe, locally abundant on calcareous shores, especially on islands, in the Straits of Mackinac area and spreading into cedar swamps and deciduous forests; also on a sandy river bank in Emmet Co. First collected in 1924 on Mackinac Island (Mackinac Co.).
Easily recognized by the large, diffuse panicle of numerous very slender, few-flowered heads and the large, triangular or 3-lobed terminal portion of the pinnatifid leaves.