Myriophyllum farwellii Morong
Common Name: FARWELL'S WATER-MILFOIL
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb
Status: T
Myriophyllum farwellii A. A. Reznicek

Small ponds and lakes, marsh borders.

A very distinctive species when fertile, but vegetative specimens may be impossible to separate from M. heterophyllum unless turions are present late in the summer (or old turion leaves are at the base). Fruiting material is known from all counties mapped, except for Houghton, from which vegetative material is referred here on the basis of very slender stem and extremely delicate foliage with minute dark spicules where lateral segments of the leaves meet the rachis. These seem almost always to be present in this species (at least on some leaves), but they are usually lacking in M. heterophyllum.

Locations

Baraga County
Gogebic County
Houghton County
Keweenaw County
    Including Isle Royale
Luce County
Marquette County
Ontonagon County
Schoolcraft County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 16, 2017. http://michiganflora.net/species.aspx?id=1425.