Of the estimated 500 species of Passiflora, in the family Passifloraceae, only one, P. edulis Sims, has the exclusive designation of passionfruit, without qualification. Within this species, there are two distinct forms, the standard purple, and the yellow, distinguished as P. edulis f. flavicarpa Deg., and differing not only in color but in certain other features as will be noted further on.
Source: https://hort.purdue.edu/newcrop/morton/passionfruit.html
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