I'm seeing tons of trees in bloom on the walks with Sheba lately, and some of them, in fact, have already peaked and have moved on to the next thing. So I figured if I were going to use the photos I've taken -- and I have way too much time invested in the photographing, selecting, cropping, and color adjusting of the pictures, at this point, to want to file them away just because they're no longer timely. So you're going to see them whether you like it or not.
I don't know what most of these are. Sometimes I'm pretty sure I have a genus, but that's about it. I'm not the tree guy. I don't have to care.
UPDATE: No solid consensus has emerged in the comments, but I'm more inclined to think Malus than the other suggestion, which was a plum (Prunus), as Malus would be the more common tree around here, and this more closely matches the fuzzy image in my head of what apple blossoms look like than any of the other flowers in this photo set.
UPDATE: Fairly definite consensus from the comments that this is a Norway maple, Acer platanoides.
UPDATE: And people agree. Possibly Magnolia x soulangeana.
UPDATE: Also thought to be Acer platanoides, though I would not have taken #2 and #4 to be the same species, so something about this ID is not setting well with me. This picture is somewhat earlier in the season than the photo for #2, so maybe this changes into that and they're the same tree.
UPDATE: Seems to be Prunus cerasifera (confusing common name: cherry plum, purple cherry plum), perhaps the cultivar 'Nigra.'
UPDATE: Perhaps an ash (Fraxinus), maybe even specifically F. excelsior, though nobody sounds terribly confident.
UPDATE: Pretty definitely Boxelder (Acer negundo).
UPDATE: Yep. Probably a maple. I'm thinking it might be another Acer platanoides, maybe 'Crimson Sentry' or some other dark red/purple cultivar. There appear to be a lot of those around town.
UPDATE: Probably a crabapple, Malus sp.
UPDATE: People agree; Cercis canadensis.
Thanks to everybody for their suggestions; if any commenters want to weigh in on the still-not-entirely-resolved cases of #1, #4, or #6, beg to differ strongly with any of the others, or just want to tell me the pictures are pretty, feel free.