Um, Crow actually. The energies are related, but different. Ravens are more loners, and crows ultimately like hanging out in big groups, talking too much, and snagging any pretty shinies that happen to come to view. Ravens are tricksters like Hermetic mages (think Robert Anton Wilson: grand gestures and high weirdness) and crows are like sacred clowns (Don't always leave the whoopee cushion at home) Some of my best friends work with Raven, so I know both pretty well.
Edit: Oops, I forgot to tell you about Raven. Raven is frequently associated with the Sun, not just by the Celts. The Native people of the NW Territories also felt Raven was associated with the Sun, by eating it, or giving it so a girl to eat, and she gets pregnant, and yet Raven is considered the father!
Raven is about the Cosmic Mystery of Change. Not just death, though that is a common association. To quote Depeche Mode: "God has a sick sense of humor."
Crow is more... earthy than that. Crow is about how Spirit is *everywhere*, especially where and in voices you don't expect. The sacred garbageman, so to speak.
Finally, I do my homework!
Ok. Here's what Cunningham has to say about Dogwood:
Sap is for wishes,(sap? my dogwoods don't seem that sappy, FWIW) the leaves and wood are used for protective amulets. So, I would guess that it would also be good for things like protective and warding magic. I would bet that if you mixed dogwood sawdust with dragon's blood or pepper (or both!) you could make a kick-ass shielding powder for one's property.
Magnolia is used for fidelity spells. (placed near or under the bed)

He doesn't say much about Magnolia, unfortunately. I would guess it also symbolizes purity and the south in general. I would further assert that it could be used for gathering strength of character and resolve. Maybe a more feminine oak-like vibe? Hey, I bet Artemis would like Magnolias.
I drove down 65 once all the way to the end and I picked a beautiful magnolia flower and carried it for most of the trip. It stayed fresh for a very very long time. Several days... without water! It had a powerful energy, but I wasn't sure what to make of it at the time.