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Indigofera spicata
A common yard weed with leaves that grow in threes and a cluster of pink flowers.
Suburban yard
Very common indeed and now a preferred host plant for the Ceraunus Blue Butterfly, which tends to fly low to the ground.
Yes, it does look like it belongs to genus Indigofera.
http://en.wikipedia.org/wiki/Indigofera
I think that's a Desmodium species.
http://en.m.wikipedia.org/wiki/Desmodium...