Panicledleaf Tick-trefoil (Desmodium paniculatum) - 2016-8-27 Newark, DE - petioles approx. 1/2", stems hairless

native

Also native is the Sessile-Leaved Tick Trefoil, D. sessilifolium. It has the long leaves, but very short leaf stems (not quite as sessile as the name suggests). The flowers are fairly pale pink.

http://www.illinoiswildflowers.info/prairie/plantx/ss_tktrefoil.html
- flowers "simple raceme of flowers, ... sometimes ... sparingly branched panicle"
- leaves "At the base of each trifoliate leaf, there is a pair of small stipules that are linear-lanceolate; these soon wither away."
- leaves on "short petioles (nearly sessile to ¼" in length)"

https://www.ct-botanical-society.org/Plants/view/166
-photo at link above