Common Cinquefoil
Potentilla simplex

f25 @ 1/400s, ISO:2000, Nikon D3S w 105mm macro

"Potentilla simplex," Wikipedia, the free encyclopedia. Potentilla simplex, also known as common cinquefoil or old-field five-fingers or oldfield cinquefoil, is a perennial herb in the Rosaceae (rose) family native to eastern North America from Ontario, Quebec, and Labrador south to Texas, Alabama, and panhandle Florida. Potentilla simplex is a familiar plant with prostrate stems that root at nodes, with yellow flowers and 5-parted palmately pinnate leaves arising from stolons (runners) on separate stalks. Complete flowers bearing 5 yellow petals (about 4-10 mm long) bloom from March to June. It bears seed from April to July. It is commonly found in woodlands, fields, and disturbed areas.
Francis A, Crane Wildlife Management Area, East Falmouth, Massachusetts