Growing up back east, I never encountered a tree that had thorns on its bark. Out here in LA, I found just such a tree in my neighborhood. It is called a Ceiba, or Silk Floss Tree (according to my photo app). It is native to Mexico, Central America and northern South America. The thorns are wicked sharp.

Please visit my Etsy shop for my artwork for sale inspired by my autistic brother Mike at: 

https://autisminspiredart.etsy.com

My other artwork for sale is at: 

https://otherartbyjack.etsy.com