Help with ID - Kentucky Coffee Tree seeds

I need help identifying this. It is hard to break but they are everywhere around my campus. A hammer won't crack it and a knife won't cut it. We taped it to the doorframe and slammed it shut. This seed(?) shattered everywhere. PLEASE HELP

Have you identified what plant, bush or tree these are growing on?

Having a picture of what those seeds came of of would really help.

Also seeing what a leaf looks like up close.

Looks like Kentucky Coffee Tree seed. They grow in large pods.

yep, kentucky coffee tree, Gymnocladus.

I merged your stuff with the following thread. I hope that is okay by you.

j te wrote:I really need help identifying this seed. They're all over my campus and idk what it is. They are VERY hard to break. A hammer won't crack it and a knife won't cut it. My roommate and I could only get it open after taping it to the doorframe and slamming the door on it.

what does that white bit on the side look like? if it's more of a line than a spot it could be a lablab bean; if it didn't have the white spot it could be kentucky coffee tree seed.

Tereza Okava wrote:

j te wrote:I really need help identifying this seed. They're all over my campus and idk what it is. They are VERY hard to break. A hammer won't crack it and a knife won't cut it. My roommate and I could only get it open after taping it to the doorframe and slamming the door on it.

what does that white bit on the side look like? if it's more of a line than a spot it could be a lablab bean; if it didn't have the white spot it could be kentucky coffee tree seed.

I googled a Kentucky coffee tree seed and that’s very much what it looks like. thank you so much!!!

The seed was found in Nebraska. I’m not sure which tree it specifically came from. Do Kentucky coffee tree seeds grow there??

Kentucky coffeetree is one I enjoy in the winter because of the interesting bark and the seedpods that are present through the winter months.

Kentucky Coffeetree, Gymnocladus dioicus, is a large, native tree that grows up to 75 feet tall and 40-50 feet wide.

Kentucky coffeetree is a great choice for Nebraska because it tolerates drought conditions,

https://acreagenebraska.org/2020/01/23/kentucky-coffeetree/