This is Passiflora mathewsii alba. This pretty white flower forms at the end of an elongated tube and blooms heavily and repeatedly throughout the Spring and Summer. This rare species is part of the Tacsonia group and is native to Peru. This particular passion vine is fairly easy to grow compared to similar passiflora. 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