Hoary Tick-Trefoil (Desmodium canescens) very long petioles - 8/31/13 Newark Oaks, DE
... until I learn differently.
-native
http://dnr.wi.gov/topic/EndangeredResources/Plants.asp?mode=detail&SpecCode=PDFAB1D090
-petioles (leaf stems) nearly as long as lateral leaflets
-terminal leaflet slightly larger than lateral leaflets
-stipules persistent
- lower surface of leaflets covered in tiny hooked hairs
-blooms and fruits August and September
-optimal identification period for this species is late August through early September