Black Medick has very distinctive semi-spiral seedpods. For years I figured the little yellow clovers in my area were hop clovers until I took a real good look at one. Black medick is very closely related to alfalfa and you can sprout the seeds and eat them just like alfalfa.
Yes, Hop Clover (genus Trifolium) or Black Medick (Medicago lupulina). They can be hard to tell apart. http://en.wikipedia.org/wiki/Medicago_lupulina, http://www.illinoiswildflowers.info/weeds/plants/hop_clover.htm
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