Great tips, Lorax.
I have found some natural hybrids between the Crataegus columbiana (red hawthorn) and the C. douglasii (black hawthorn) at one site-source. Three other site-sources have what appears to be pure columbiana. On my homepage, I have posted one photo that shows the stunning and well-armed C. columbiana. This small tree is endemic to the columbia river and a few of its tributaries. C. columbiana is a gnarly twigged (like filbert), squatty hawthorn that grows wider than tall. The fruit seems to have a bit more of the heart stimulant also found in C. douglasii. I have seen wild doves overconsume the red but never the black.
My experience has shown columbiana seeds, without acid scarification, need a very long cold strat interrupted by short warm then a second 'winter'. I never allow seeds to dry, put them straight to cold moist strat for 10 months, then warm for 2, then cold again for 6. I would like to be able to shorten this procedure a bit. I wish there were some zoo that wanted to go into cooperative seed scarification through their bears! They could reduce their food bill while clearing a profit on the prestratted seeds if they didn't mind cleaning them up a bit first.
By the way, last year I used an easy method for obtaining near 100% germination from the recalcitrant Acer glabrum douglasii, douglas maple, if anyone is interested.