A two-year experiment looking at different brassicas for browsers has given some interesting results. Summer survival is the main impediment to widespread use of this group of forbs. Cultivated summer annual legumes for browsers. Verdict is in on this one and a publication will be out soon. Production is low since the two summers studied were rather dry.
Seed production is good, however, especially for partride pea and phasey bean.
Take a look at the legume web page.