Beach pea must get to inland sites with birds. Birds go everywhere. So why are the inland sites so limited. Could it be that if birds eat these pods they can't fly? The pods are poisonous, and cause paralysis. So the Great Lakes and Lake Champlain may have benefited from a few birds that were resistant, or only ate a few seeds without pods. In some places the seeds have been roasted for coffee, and the greens eaten as vegetables. Tough to explain that one! Very, very, very hungry or thirsty anyone?