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The new site offers several benefits over the existing website, including real coordinate mapping, giving a clearer view of the density of documentation as well as more precision about plant distributions and their link to landforms. We will also have the ability to update species pages more regularly, both in terms of new collections and as more existing Michigan specimens are georeferenced. In addition, we have a better photo display, and offer indented keys.

Calystegia sepium (L.) R. Br.
Coefficient of Conservatism: 2
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Nt P-Vine

Calystegia sepium B. S. Walters

Thickets and banks along streams, rivers, and shores; marshes and meadows; ditches; borders of swamps; often in weedy places and usually in little if any shade; the twining stems often forming great tangled masses on other plants.

Authors have differed in sorting out the variation in this species; subspecies (or varieties) seem not clear-cut, and intermediates are occasional. The great majority of our material is the native pink-flowered subsp. americana (Sims) Brummitt, with open leaf sinuses. A few pink-flowered specimens from the southern half of the Lower Peninsula have the lobes of the leaf bases overlapping and the bracts and sepals apparently in a single series; these are subsp. erratica Brummitt. Also uncommon, but occurring throughout the state, is subsp. angulata Brummitt, with white flowers and spreading, two-angled leaf lobes. The European subsp. sepium is also white-flowered, but it is not clear if any Michigan material is this introduced entity, which has smaller flowers than subsp. angulata and apparently lacks the two-angled leaf lobes.


Alcona County
Allegan County
Alpena County
Antrim County
Arenac County
    Including Charity Island
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Branch County
Calhoun County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Delta County
Emmet County
Genesee County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Jackson County
Kalamazoo County
Kent County
Keweenaw County
    Only on Isle Royale
Lapeer County
Leelanau County
    Including Manitou Islands
Lenawee County
Livingston County
Mackinac County
Macomb County
Mason County
Mecosta County
Menominee County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ontonagon County
Ottawa County
Presque Isle County
Saginaw County
Sanilac County
Schoolcraft County
St. Clair County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. February 1, 2023.