Utricularia cornuta Michx.
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Utricularia cornuta B. S. Walters

Fens (sometimes in sphagnum on poor fens), margins of ponds and lakes, marshy shores, pools between dunes, marly areas; also in softwater lakes and their sandy shores.

This is undoubtedly the bladderwort most often seen by travelers in Michigan, for it can form extensive bright yellow carpets in sandy interdunal hollows, borrow pits along highways, and in wet peatlands. In unusually dry years flowers may be scarce, as they may be also in extraordinarily wet seasons. The flowers (sometimes mistaken for some kind of orchid) are very fragrant and attract insects, even large yellow tiger swallowtail butterflies.

Robust plants may be as tall as 35 cm. The tiny bladder traps of this so-called terrestrial species are, as in U. resupinata, buried with the branch and leaf system in the substrate.

If one has a blooming Utricularia without basal parts, U. cornuta can be recognized by having tiny bracteoles narrower but slightly longer than the bracts of the inflorescence subtending them. No other of our species has such bracteoles.


Alger County
Allegan County
Alpena County
Antrim County
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Crawford County
Delta County
Dickinson County
Emmet County
Gogebic County
Grand Traverse County
Gratiot County
Houghton County
Huron County
Ingham County
Iron County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Leelanau County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Manistee County
Marquette County
Mason County
Missaukee County
Montcalm County
Montmorency County
Muskegon County
Oakland County
Otsego County
Presque Isle County
Schoolcraft County
Wexford County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 26, 2022. https://michiganflora.net/species.aspx?id=1614.