It’s the first time I’ve seen one too. It was in full bloom in the botanical garden in Oslo today. It’s called a dove tree or a handerchief tree (Davida Involucrata). Lots of people had gathered under the tree to get cover from the rain. Just wonderful.
Jessica's lens 
I’ve never seen blooms / white leaves like in the first photo before. Do you know what kind of tree it is?
It’s the first time I’ve seen one too. It was in full bloom in the botanical garden in Oslo today. It’s called a dove tree or a handerchief tree (Davida Involucrata). Lots of people had gathered under the tree to get cover from the rain. Just wonderful.