Hi Sharon,  Is the potentilla the shrub form on perennial?   If shrub form, yes it is firewise.  Spruce is not firewise.  The other three do not have any research on their firewise rating which is why they are not included in our latest guide.  The main characteristic of each of the peony and oregon sunshine suggest firewise. The milkweed tends to spread and may have a dried out head, so less firewise.  There is more to plant selection alone that dictates firewise.  Some HOAs may allow the use of a fireprone plant (e.g. spruce) if it is planted further out away from home and isolated.  So design also plays a big role.  

Hope that helps,   Thanks,  Amy Jo