Rabbit-foot Clover (Trifolium arvense) is a possibility

Finger Lakes, NY (July 3-6, 2008)
Trifolium arvense (Rabbit-foot Clover)
Rabbit-Foot Clover is easy to distinguish from other plants because of its exceptionally hairy flowerheads and trifoliate leaves says:
http://www.illinoiswildflowers.info/weeds/plants/rf_clover.html
-Rabbit-foot Clover "Leaves are compound in 3s; leaflets are about ¾ inch long and to ¼ inch wide, mostly toothless, tapering at the base, with a blunt or rounded tip and widest at or above the middle. Surfaces are sparsely hairy, and fine hairs are all around the edges.
-At the base of the leaf stalk is a pair of hairy, awl-shaped appendages (stipules), ¼ to 1/3 inch long, green to red. Stems are erect to ascending, much branched, and densely hairy but may become smooth with age.", says:
https://www.minnesotawildflowers.info/flower/rabbit-foot-clover
for example of stipule see also:
http://www.delawarewildflowers.org/plant.php?id=2030
leaves are hairless - Trifolium hybridum (Alsike Clover)
has chevron on leaves - Red Clover, Cowgrass (Trifolium pratense)