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.
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.