I first guessed that it might be part of some tree, or perhaps a seedling.
Most members of this family and genus are vines with rather proportionally-sized leaves, nothing like this plant. Not having any sort of flora for Ecuador, I relied upon Google to find the name. I took the WWJD approach to botanizing: I googled "Passiflora megafolia." Nope. Then I tried the slightly less imaginative "Passiflora macrophylla." Bingo. It turns out that one botanist tried naming it "P. gigantifolia," so I was that far off at first.
To those who might wonder: I did not collect any seeds, sorry. There were no ripe fruits in any event.