actually this is my first post here, I've been lurking for a couple of weeks.
I'm a big Hawthorn lover, and I did a search on the word. One of the moderator guys here-his handle is OldBow did a gorgeous Hawthorn bow and posted it about a year ago. Search on it, and it should be your first hit.
That's the only one I found. I have a good supply of hawthorn here in NE Georgia. I have not yet made a bow, but I'm dying to jump in. I've made walking sticks for some time, and have made some gorgeous ones out of Hawthorn. I have seven or eight staves of it in various stages of drying right now. I know where there's good straight bow waiting on a tree too!
Mark