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Medicago lupulina L
Also known as Black Medic, Yellow Trefoil is a low growing summer weed. It is commonly found throughout the US. It has a distinctive leaflet pattern and small yellow flowers.
Nice find! The flower and leaf shapes are a bit different from Medicago lupulina. You can compare here: http://www.illinoiswildflowers.info/weed...
Spotted on Aug 29, 2014
Submitted on Sep 8, 2014