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. 3-5 cm long; flowers solitary on elongate peduncles.

2. Flowers nodding, the perianth segments forming a bell shaped flower, not opening flat; uncommon native in the western Upper Peninsula.

C. occidentalis

2. Flowers up-facing, the perianth segments spreading widely to form a flat flower; rare escape from cultivation.

C.×jackmanii

1. Perianth white, the segments ca. 0.7-2 cm long; flowers in small to large inflorescences.

3. Leaflets coarsely toothed; flowers unisexual; perianth segments finely hairy on the upper surface.

C. virginiana

3. Leaflets entire; at least some flowers bisexual; perianth segments glabrous on the upper surface.

C. terniflora