Please look at the attached pictures I believe in the Carya genus or possibly Aesculus. My questions are: The (last 2 photos) dried out (I would call them nuts) - the actual seeds are inside. What is the outside call botanically? Also what is its purpose - to protect the seed? The other pictures (first 3) - are they next years flower buds? Also - on a London Plane the balls - are they the "fruits" of the tree and the seed is inside the fruit. Thank you.