At the moment I've only been able to identify what tree this isn't! I'll have to fill in this small detail when there's a bit more on it to identify it by. I love this time of year - all the trees coming into leaf and the leaf buds are the most sculptural forms - they always remind me of the photographs of Karl Blossfeldt.
pen, ink, pastel, varnish...
(...its a Vibernum! - thanks Pete)
...from my seasonal colour sample notebook.