Several species of Clematis are cultivated, and may occasionally escape. Among those known from adjacent states and Ontario are C. orientalis, with yellow flowers; C. recta, with an erect, non-climbing habit; C. vitalba, similar to C. terniflora in having ± entire leaflets but with perianth segments densely pubescent on the upper surface; and C. viticella, with blue to violet flowers.
1. Perianth pink-purple, the segments ca. 3–4.5 cm long; flowers solitary on elongate peduncles.
1. Perianth white, the segments ca. 0.7–2 cm long; flowers in small to large inflorescences.
2. Leaflets coarsely toothed; flowers unisexual; perianth segments finely hairy on the upper surface.
2. Leaflets entire; at least some flowers bisexual; perianth segments glabrous on the upper surface.
All species found in Clematis
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/genus.aspx?id=Clematis.