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Known as Mexican climbing cobaea when introduced in 1792, the development of the flowers is a show unto itself. They start as green, five-cornered, papery buds, then open to reveal the green calyx and bell-shaped flower. Next, the pale green flower becomes striped with violet, finally changing to a varnished royal purple before dropping. The foliage and tendrils are shaded with violet and add another layer of beauty from spring to late fall freezes.