Well... of course, as soon as I post this I find a list from the Arbor Day order (or at least, I think it was that year's order). No idea which is which (which of the ones that came in this bundle actually survived), but could the third photo be a young Sargeant Crabapple? That's on the list, as is Eastern Redbud, Washington Hawthorn, dogwood (I know it's not that), Goldenraintree and crapemyrtle (I remember wondering why on earth they were shipping crapemyrtles to New England!!) In theory (meaning assuming they sent what they said they were sending), it should be one of those -- and the crabapple seems like the only one it could be? I'd be floored if they were shipping free Bradford pears (which is what someone on Name that Plant thought it was as well) -- aren't they considered more or less invasive plants in a lot of areas these days? So I'm hoping for Sargeant crabapple since I wouldn't mind having one of those for the birds (means the little guy can stay right where he is now, in the bird/butterfly garden).

That is not a tree. Looks like Partridge Pea, which is Cassia fasciculata (now called Chamaecrista fasciculata ?), but it is hard to be sure because I can't quite see the flower itself. By the way, chueh, you are welcome to ask questions on the Georgia forum too. Here is a link that might be useful: Georgia forum

Thanks, Alicia...we'll keep track of it this coming season. The AHS A-Z Plants 'bible' says it has edible berries, so maybe we've found a little treasure back there among the briars, brambles, and honeysuckle.

Mountain mint, Pycnanthemum, looks like P. Virginianum. There are multiple species in the genus, they all seem to be rather attractive to butterflies. There's a butterfly forum, you might post an inquiry there about preferred species.