Passion Flower. Passiflora x decaisneana. Large, 4-5 inch flowers followed by orange, edible fruit. Vines are vigorous. Often confused with P. quadrangularis. Pages from Deutsches Magazin für Garten- und Blumenkunde. (1854) | From the botanical illustration collection of Swallowtail Garden Seeds. This image is in the public domain. Right click to download. Use as you choose.