Utricularia minor L.
Common Name: SMALL BLADDERWORT
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Utricularia minor B. S. Slaughter

A circumpolar and usually calciphile species, its range extending in some places, like that of U. intermedia and U. vulgaris, north of the Arctic Circle. Fens (sometimes in sphagnum), sedge mats, swales and marshes; wet open thickets and peaty lake margins; often in ruts and animal trails in such habitats.

In shape, the leaves resemble very miniature flat fronds of staghorn fern. This species and U. gibba are both very slender and small-flowered, the corolla not over 9 mm long, and they often grow intermixed. The more flattened leaf segments of U. minor are nearly always easily seen under a lens. Small shoots (e.g., from turions) of U. intermedia may resemble U. minor but can be distinguished by the complete absence of bladders and the presence of marginal spicules on the leaf segments. The flowers of U. minor, being a rather pale dirty yellow, are not as conspicuous as the equally small but bright yellow ones of U. gibba and U. geminiscapa, apart from the more chubby and less linear shape of these two. Some fragmentary specimens that otherwise appear to be U. minor have unusually narrow, elongate, flat ultimate leaf segments with a few marginal spicules; they may be derived from expanded turions.

Locations

Alger County
Allegan County
Alpena County
Arenac County
Barry County
Benzie County
Berrien County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Only on Drummond Island
Clinton County
Delta County
Emmet County
Gogebic County
Grand Traverse County
Hillsdale County
Houghton County
Ingham County
Ionia County
Iron County
Isabella County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Only on Isle Royale
Leelanau County
Lenawee County
Luce County
Mackinac County
Macomb County
Marquette County
Mason County
Mecosta County
Montcalm County
Montmorency County
Oakland County
Ontonagon County
Otsego County
Presque Isle County
Roscommon County
Schoolcraft County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 14, 2017. http://michiganflora.net/species.aspx?id=1618.