This cucurbit germinated in container mix in a pot on my back porch. I moved it to a larger pot. The fruit shown is immature and was pale yellow from the beginning, never green. I don't think it is a common domestic cucurbit. Could it possibly have been sown by a blue jay from seed in parrot food in an adjacent yard? I will let it ripen and save seed. I will not eat the fruit unless I can identify it as an edible plant.
Vine growing in a tree at the edge of a field on my place. The vine has large leaves with 3 points & there is red fruit hanging from the vine. The fruit is about the size of a tennis ball. There are mesquite trees and mountain junipers all around. The grass at the edge of the field is about 3 - 4 feet tall and there is no crop planted in this field, but it has not been plowed yet. This is the only vine like this that I have seen on our 640 acres.
This looks like Coccinia grandis, but only 1/4 in size fo Coccinia grandis.
I found many specimens of the dried seed pods along a bank, and several of the pods were still attached to the vines. It was the middle of August and the pods were all dried and split open to varying degrees. The pods are generally as large as my closed fist with long spikes.