Riverside County, California, US
A fruit of a wild cucumber vine. For me, these are almost always found on the ground and empty. I have yet to see one actually hanging from the vine.
Marah (the manroots, wild cucumbers, or cucumber gourds) are flowering plants in the gourd family (Cucurbitaceae), native to western North America. They are also commonly called Old man in the ground. The genus (which Kellogg noted was characterized by extreme bitterness) was named for Marah in Exodus 15:22-25, which was said to be named for the bitter water there.