Cuscuta gronovii Roem. & Schult.
Common Name: COMMON DODDER, SWAMP DODDER
Coefficient of Conservatism: 3
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt A-Vine

Usually in marshy or swampy ground. The most frequent hosts include Impatiens, Salix, Cephalanthus, Decodon, and Eupatorium, but documented Michigan hosts involve species in over 40 genera in at least 25 diverse families. This American species has become naturalized as a weed in Europe.

This is by far our most common species; skeins of orange stems covering vegetation a frequent sight in southern Michigan. It is also highly variable. The flowers are often somewhat glandular-warty, especially toward the summit of the fruit, and this aspect in combination with the rounded corolla lobes may be helpful in identification. The flowers are (2–) 2.2–4.2 mm long; the old withered corolla generally surrounds the fruit, or is sometimes persistent at the base of it. The styles are ca. 1–2.2 mm long. A specimen from Monroe Co. has been identified as the more southern C. rostrata Engelm. & A. Gray, but we are dubious and consider it an unusual C. gronovii.

Locations

Allegan County
Arenac County
Barry County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Cheboygan County
Clinton County
Eaton County
Genesee County
Gratiot County
Hillsdale County
Ingham County
Ionia County
Jackson County
Kalamazoo County
Kent County
Lapeer County
Leelanau County
Lenawee County
Livingston County
Macomb County
Manistee County
Mason County
Mecosta County
Menominee County
Midland County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Ottawa County
St. Clair County
St. Joseph 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 18, 2017. http://www.michiganflora.net/species.aspx?id=855.