PlantFiles is getting a new look! Just in time for spring, we're rolling out a new look for the best online plants database. It will also work with your smart phones and mobile devices, so now you can take it with you on garden center visits or botanical garden tours. Questions or comments? Please post them here.
Those were ID'd as Weigela florida - note the opposite arrangement of foliage. Very different from any Spiraea sp. that you'll ever run across.
The little tree is a Sweetgum seedling Liquidambar styraciflua, NOT a Maple. Again - note the arrangement of foliage. The leaves occur alternately along the stem, rather than opposite as in all things Acer...
Again - you can post pictures of dormant plants from which contributors here can help confirm the identity of your plant. You can even prune off a stem, bring it indoors on a countertop, and take some closeup images that way.
There are a number of dwarf selections of Weigela florida which have the dense congested stems as you've described. I've got one that I planted ten years ago that is not more than two feet tall - Wiegela florida 'Minuet'.