Coefficient of Conservatism:
Coefficient of Wetness:
B. S. Walters
Swamps and (less often) marshes, moist disturbed forests and thickets, ditches and weedy areas, lake shores and river banks.
Typical European plants are said to be usually if not always dioecious and to have broader ovate and definitely cordate leaf blades, which bear stinging hairs on both surfaces. Such plants are represented in Michigan only by a Houghton Co. collection (Lake Linden; O. A. Farwell 8513 in 1929, BLH, MICH). Most if not all of our plants are monoecious, have narrower, smoother leaves, and are the native subsp. gracilis (Aiton) Selander.