The Caucasian Zelkova (species name: Zelcova carpinifolia) is a fairly large deciduous tree native to the Caucasus region of southeastern Europe. The Zelcove genus is a family of six tree species in the Elm family. The tree featured in this post is located in the Madrid botanical garden.
The Caucasian zelkova has a unique shape that consists of multiple branches branching off near the base and that are almost vertical and grow very close together. The images above shows how these branches give the tree an almost bottle shape.
Trunk base with fairly smooth gray bark
Another view of the way the main branches grow almost vertical