Mystery Tree Seed Pod

Asked April 7, 2020, 8:33 PM EDT

I'm looking for an identification of few seed pods I found in my yard. This is the first time I've seen them despite living here for 9 years. I assume its a tree seed due to size. We live in a forest on the banks if the Cedar near Cedar Rapids. It has a pod, which i broke open to reveal a rather large brown seed.

Linn County Iowa

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