The days are alternating warm and cool, but already flowering trees are making Tokyo shine with color and beauty. I am not sure what type of flowering tree this is. I think it’s a plum called “eight petal” or 八重梅 (やえうめ). It’s in full bloom along a pedestrian path in Nakano.
From a distance the tree grabs your attention, but standing under it is sublime. Here are two more images: the context in a crowded neighborhood, and hundreds of buds popping open.
Tokyo Green Space 
This may be Prunus mume, what Norteamericanos call Mume, or Japanese apricot, but it’s sort of a halfway between plum & apricot. Can’t get it in California anymore, it seems.
That’s interesting. I wonder if mume is a combination of momo (peach) and ume (plum). Thank you, J-son!