This is Passiflora subpeltata, also known as White passion flower. This climber begins blooming in late spring and finishes in the middle of the Fall. It is a popular plant with all of the bees, birds, and butterflies. This is a host plant for the Zebra Long Wing, Zebra Heliconian, Julia Heliconian, Isabellas Heliconian, Banded Orange Heliconian, Mexican Fritillary, Scarce Bamboo Page, Erato Heliconian, Variegated Fritillary, and Gulf Fritillary butterflies. It is also a larval host plant for the Plebeian sphinx Moth. USDA Hardiness Zones 9 to 11