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Lathyrus odoratus
Do you think It could be a vine that covered a bush, to make it look bushy. If it is a bush try searching the genus Robinia
http://en.wikipedia.org/wiki/Robinia
more like a bush. there were humming birds feeding from it and the flowers were about a half inch across.
Do you have any more pictures of the rest of the plant? or can you describe it? is it a tree, vine, etc.?