Utricularia vulgaris L.
Common Name: COMMON BLADDERWORT
Coefficient of Conservatism: 6
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Lakes of all kinds, interdunal (and other) ponds and swales, wet peatlands and marshes, rivers and streams. Often in water up to 2 m deep; the deepest recorded on Michigan specimens is 4.6 m.

Our plants are subsp. macrorhiza (J. Le Conte) R. T. Clausen (sometimes recognized as U. macrorhiza J. Le Conte) differing from European plants by small floral characters.

After the main forking of the leaves next to the stem, those of robust U. vulgaris often have a more pinnate than dichotomous aspect, with a slightly zigzag and broader central axis and many forked lateral segments. The main segments on such large leaves are sometimes flattish (at least when dried).

Fertile specimens are easily distinguished from other species, and so are those large coarse vegetative ones, with leaves 3–5 cm or more long and up to 22 levels of forking, bladders nearly or quite 5 mm long, and massive turions as much as 3 cm or more across. The total diameter of a leafy branch may be 10 cm. Small fragments of depauperate growth, on the other hand, are often not safely distinguishable from vegetative U. geminiscapa, although experience with good fertile material of both species will then help one decide on the basis of characters not able to be quantified to the extent desirable in a key. Utricularia geminiscapa is often said to have the ultimate segments of the leaves entire or with few spicules, while in U. vulgaris there are more numerous spicules. There is no consistent difference in number of spicules (always few), but in U. vulgaris they do tend to be somewhat larger, arising at times from a tiny green tooth on the leaf margin. In turions of U. vulgaris (usually 5–30 mm broad), the crowded leaves are heavily provided with glistening apical and marginal spicules often giving a grayish as well as minutely prickly aspect to the structure (like those of U. intermedia). The turions of U. geminiscapa run smaller, perhaps less compact, and certainly more green and less prickly in aspect. Utricularia geminiscapa is much more narrow in habitat and is never expected to develop a layer of marl on the foliage, whereas U. vulgaris when growing in alkaline water may develop (as do many other aquatics) a layer of carbonates.

Locations

Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Clare County
Clinton County
Crawford County
Delta County
Dickinson County
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Midland County
Missaukee County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Osceola County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Schoolcraft County
St. Clair County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County
Wexford 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=1623.