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'Clematis × triternata' from the website Trees and Shrubs Online (treesandshrubsonline.
This cross of C. flammula and C. viticella is represented in cultivation by the cultivar ‘Rubromarginata’.
Synonyms / alternative names
Clematis × triternata f. rubromarginata (Jouin) Rehder
Clematis violacea var. rubromarginata (Jouin) Rehder
Clematis × rubromarginata Jouin
Flowers 1 to 11⁄2 in. across, sepals reddish violet, but white at the base. Their fragrance is equal to that of C. flammula, and they expand during the same period. One of the most charming of late summer-flowering climbers.