White-leaf Leather-flower (Clematis glaucophylla) (subgenus Viornae) 2015-5-16 Mt. Cuba Center, New Castle County, Hockessin, DE
Mt. Cuba Center also has Clematis viorna but that has different leaves and a different blooming habit
http://www.mtcubacenter.org/plant-finder/details/clematis-viorna/
another example of multiple flowers of C. viorna:
http://plants.usda.gov/core/profile?symbol=clvi4
http://www.mtcubacenter.org/plant-finder/details/clematis-viorna/
another example of multiple flowers of C. viorna:
http://plants.usda.gov/core/profile?symbol=clvi4
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