Zelkova serrata

Interesting name - the "zelkova" bit, "serrata" is pretty straightforward. I was half-expecting to find that it was named after a botanist (Russian or Bulgarian perhaps) with surname Zelkov. But Wikipedia has this to say on the subject

"The name Zelkova derives from the native name of Z. carpinifolia in one or more of the languages of the Caucasus, as shown by the Georgian name, ძელქვა (dzelkva). ძელ dzel meaning "bar", and ქვა kva meaning "rock". The tree was often used for making rock-hard and durable bars for building."

There is a very nice tree in the Cambridge University Botanic Garden, and it is of this interesting yellow-orange-brown color right now.

Zelkova serrata at shutterstock