1. Bark shredding and peeling, lacking lenticels; pith between nodes of older stems brown; petals coherent distally, falling as a unit; leaves simple (though sometimes lobed).
1. Bark tight, with lenticels; pith (between nodes) of older stems white; petals distinct, falling separately; leaves compound (except in Ampelopsis brevipedunculata).
2. Leaves palmately compound, leaflets simple, toothed, all ± equal in size; pith between nodes of older stems continuous; mature fruits dark blue-black.
2. Leaves simple, or if trifoliolate or 5-foliolate, the leaflets pinnately lobed; pith between nodes of older stems brown becoming chambered; mature fruits pale lilac to blue or orange to yellowish.
All species found in Vitaceae
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 22, 2019. https://www.michiganflora.net/family.aspx?id=VITACEAE.