I use the Thompson & Morgan Seed Germination Database which is invaluable. It's out of print now but available on the web. A few years ago I copied it and turned it into a Word file. I can't wait to see this book and compare it.
Here is a link to the Seed Germination Database - After the Hint's section it lists the genus with specific instructions.
http://www.backyardgardener.co...
If anyone would like a copy of the Word file just Tree mail me with an email address and I'll send it to you.