Heteranthera dubia (Jacq.) MacMill.
Common Name: WATER STAR-GRASS
Coefficient of Conservatism: 6
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Heteranthera dubia plant S. Fawcett plant

Shallow to deep water (recorded to 5.5 m) of ponds, lakes, marshes, rivers, and streams.

Most submersed plants are vegetative or have cleistogamous flowers hidden in the bases of the submersed leaves. Flowers with bright yellow perianth occur on plants stranded on muddy, sandy, or peaty shores and banks.

The midvein is almost always indistinct or no more prominent than other longitudinal veins of the leaf, thus distinguishing this species vegetatively from species of Potamogeton (also alternate-leaved) with similar strap-shaped leaves. In addition, Potamogeton zosteriformis has a very flat stem (it is rounded in cross-section in Heteranthera) and the stipules are entirely free from the leaf; P. robbinsii has partly adnate stipules, but the base of the free blade is slightly auricled, while in Heteranthera there are no auricles.

Locations

Alger County
Antrim County
Baraga County
Barry County
Benzie County
Berrien County
Branch County
Calhoun County
Charlevoix County
    Including Beaver Island
Cheboygan County
Clare County
Emmet County
Genesee County
Gogebic County
Gratiot County
Hillsdale County
Ingham County
Ionia County
Iosco County
Isabella County
Kalamazoo County
Kent County
Keweenaw County
    Only on Isle Royale
Lenawee County
Livingston County
Luce County
Macomb County
Marquette County
Mason County
Midland County
Missaukee County
Monroe County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ottawa County
Presque Isle County
Roscommon County
Schoolcraft County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 16, 2017. http://www.michiganflora.net/species.aspx?id=2315.