Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, michiganflora.net will point to this new site.

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.

B. S. Walters male flowers

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An herbaceous vine in rich dense or dry open forests, fencerows, and thickets; often along pond and marsh borders, river bottoms, and railroads.

Al-Shehbaz & Schubert (1989) consider D. villosa to be a primarily Coastal Plain species with strongly ridged stems and leaves all alternate, while recognizing our plant as D. quaternata J. F. Gmel., with essentially terete stems and the lowest leaves on the stem whorled. Many, however, regard this variation as part of a broadly defined D. villosa. Herbarium collections often do not have the lower portions of the stem, but our plants in the field may have the lowermost leaves alternate or whorled in the same population, and the stems seem slightly ridged. Hopefully further work will clarify this situation.

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