Viburnum trilobum Marshall
Synonym: Viburnum opulus
Coefficient of Conservatism: 5
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt Shrub

Included in V. opulus in Michigan Flora.

Swamps (both hardwood and coniferous), borders of forests and shores, wet roadsides and ditches; banks and thickets along rivers and streams, fens; and other moist often open ground.

The ripe fruit is red and about the size of a small cranberry; it makes a tasty jelly. Often known as V. opulus var. americanum Aiton or V. opulus subsp. trilobum (Marshall) R. T. Clausen. Variation in the petiolar glands, typically used to distinguish this from V. opulus, is considerable and often cited differences in shape and stalking are not always easy to apply to Michigan material, especially when the glands are additionally distorted by pressing. The gland size differences, however, seem to represent a real discontinuity and, with practice, one can readily distinguish the two in the field. Generally, the central lobe of the leaf, especially in the youngest leaves of longer shoots, is more distinctly longer than wide than that of V. opulus, and often less toothed. In our collections of V. opulus, the upper leaf surface is glabrous, except sometimes near the margins, but in V. trilobum there are at least sparse scattered hairs over the entire surface.


Allegan County
Alpena County
Antrim County
Baraga County
Barry County
Benzie County
Berrien County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Delta County
Emmet County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Ionia County
Iosco County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Manistee County
Marquette County
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Mecosta County
Montcalm County
Montmorency County
Muskegon County
Oakland County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Schoolcraft County
St. Clair County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. April 22, 2021.