Pycnanthemums can be difficult to ID -- albescens/montanum/incanum/muticum/virginianum don't differ that much. Of the species I'm familiar with, your pics look most like Pycnanthemum incanum. Incanum is pretty widespread, and has the more ovate leaves as seen in your pics. Albescens leaves tend to be more lanceolate and more deeply toothed. But then, there's a fair bit of variation within all species, and certainly within this genus. I've wondered whether Pycnanthemums in that complex intergrade or hybridize, as there have been some I simply couldn't ID with certainty due to characteristics of more than one species on a single plant.

Second one is definitely Spiranthes: s cernua is likely. Here are the rest if you want to get more specific... http://bonap.net/NAPA/TaxonMaps/Genus/County/Spiranthes First one is not obvious to me. Square stem? Fragrant foliage? Maybe pycnanthemum virginianum or similar.

Both Oakleaf hydrangea and Bottlebrush buckeye can handle sun and shade, though they may need more water in sunnier conditions (and especially the year you plant them, when they are getting their roots established.) You are correct that the oak will cast some shade when mature, but that will be years down the road, so you could definitely get started with some fruits and veggies now, and worry about shade later. I'm also in 7b, and I've had luck this year growing strawberries and figs, and understand that blackberries/raspberries also do well in this zone. Blueberries can be tricky because they love cold winters. Another native shrub,American beautyberry (Callicarpa americana), LOVES sun and grows tons of magnificent magenta berries. The birds will love them in the fall, and/or you can pick them to make jelly (they are a bit bland right off the bush). (By the way, I made some plant names link to articles about their growing conditions, one my screen it shows up as green text that I can click) Butterflies will love species like Phlox paniculata, Mountain Mint (genus Pycnanthemum), and Blue Mistflower (Conoclinium coelestinum), plus many others. If you see butterflies on flowers while you shop for plants at a local nursery or botanical garden, that's a pretty good endorsement that they'll like it planted in your yard too. Your oak will also be great for attracting butterflies, since many of their baby caterpillars eat oak leaves (usually minimal so you don't notice, especially once the oak gets tall). American beautyberry in fruit: Painted Lady butterfly on my blue mistflower last fall:

More winter sowing going on here. Things that were not even on my list are making it out there, stuff I found laying around... Wild blueberry today and pasture thistle seeds yesterday. Put out a 50 cell tray of Zizia aurea today too. I dunno, the promix I have says "not for use outdoors", so I mixed it 2 parts pro-mix, 5 parts pine bark fines, and added some controlled release fertilizer and put it outside under hardware cloth. I have two more species to sow soon because it says they do best sown outdoors in the fall, any other trays I'll artificially stratify, seed in the spring, and put out under greenhouse plastic with straight promix.