ummm.... I forget the dudes name who first did it. i know he was a gardener from the 18th century. I know greger mendel was the first guy to succesfully cross breed plants, it was a pea plant. Do you need to know how to cross breed a certain kind of plant, or would the process of cross breeding pea plants work? i could find a site in the guy for you which might help.
i dont know if these will help you at all,but your cheating any way so who cares.
http://www.ag.uiuc.edu/~vista/html_pubs/PLBREED/pl_breed.html
http://www.thinkquest.org/library/site_sum.html?tname=20465&url=20465/peaexp.html