If it helps here's a website that talks about madrones and how to propogate it.
http://students.washington.edu/mell...cultivation.htm
Let me know if you get any success with it. I have many small madrones on my land. I'll have to try collecting one just for the fun of it.
I'd be interested to know what the difference is between a Pacific madrone and a Texas one. Ours here are massive 100+ ft. trees that love to cling to eroded cliffs over the puget sound, and do almost as well in the middle of a dense forest.
Good luck to you in any case.