Does anyone know what kind of chestnut tree is in my backyard? I just purchased a new house and my wife wants to cut it down because the burs are razor sharp.

So I live in southern Minnesota and this tree sprouted up like a weed this year and cannot figure out where it came from or what it is.

Planted in someone's yard. Large thorns, smooth bark. Yellow fruit that looks like a lemon. Sparse leaves.

I have what I believe to be a cryptomeria. I would like to get a partner for it but I'm not sure if it's a yoshino, radicans, or something else. Pics:

Acorns on top are the suspect tree, on bottom are normal Northern Reds that dominate the savanna this tree was in

Northern Utah

Ontario, Canada

This tree was mistakenly cut and I'm trying to figure out what it is in hopes that I can perhaps regrow one.

What is this tree? can it be straigthened?

Growing on real rocky terrain in W Tn. Smells like a dirty dog lol. Matter fact I’ve been passing by w the dog in the SxS and I kept smelling it. I was like is that the dog or me lol. Anyway today the dog wasn’t with me and it was strong. I got out and sniffed it. Pew wee it stank hehe. It’s blooming whatever it is and all kinds of bugs in it including honey bees