Serviceberry is all over this side of the cascades, I'm a bit south of Portland.
It's also called Saskatoon and from what a good many bowyers tell me, it's one hell of a bow wood also.
Ocean Spray will check badly, probably not an issue this time of year but don't be in a hurry to work on em.
I've had good luck tweaking them a bit every day to get em straight while keeping them lashed dowel.
Wild rose also checks if you remove the bark too soon.
Red osier, a type of dog wood, is commonly used as an ornamental. This time of year it's easy to spot, very red and straight. Look for it on road sides and wetter areas, once you know what to look for, it's every where! It is very rubbery when green. Ive never had it check on me even in the summer months. Use heat to straighten them .
One of these days Ill split some wind fallen cedar or fir for some shafts.
I'm new to making bows but been after my own arras for years now.