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Closeup of the fascinating flower... it's only approximately 3/8" diameter.

Passiflora lutea – ​This U.S. native Passionflower with light yellow-green 1” flowers blooms for a long season: May ‘til September. Yellow Passionflower is a major food source for several species of butterfly larvae including the Julia Heliconian Butterfly. The pretty green leaves are three-pointed, virtually lobed, architectural and distinctive. With the ability to sprout from its spreading root system it is a potentially suckering vine but is said to not be aggressive. Site Passiflora lutea in part shade planted in calcareous, draining sandy loam. Spring planting is advised in the north. Pot grown by stem or root cuttings.