Etymology: Myriophyllum: from Greek myrios, "numberless," and phyllon, "leaf," alluding to the many divisions of the submerged leaves of these aquatic plants
Plants: perennial, submersed aquatic; stems greenish-brown
Leaves: whorled, stalkless; finely pinnately-divided into 7-10 thread-like, paired leaflets
Flowers: 4-parted, club-shaped winter buds; flowers from the axils of the sharp, deeply-lobed, whorled bracts

Floristic Rating: Coefficient of Conservatism = 8, Wetland Indicator = OBL USDA Plants Database: Federal Distribution and detailed information including photos USGS - Northern Prairie Wildlife Research Center: Wetland Plants and Plant Communities of Minnesota and Wisconsin