Common Blackberry (Rubus allegheniensis)?

2013-6-15 Newark Oaks, DE
Rose family (Rosaceae)
has 12 flowered inflorescence
http://www.illinoiswildflowers.info/savanna/plants/cm_blackberry.htm
http://dendro.cnre.vt.edu/dendrology/syllabus/factsheet.cfm?ID=139
flower:
http://plants.usda.gov/java/largeImage?imageID=rual_005_ahp.jpg

or:
Common Dewberry (Rubus flagellaris)?
aka Yankee Blackberry
alternate compound leaves doubly serrate
terminal leaflet has a short petiolule
lateral leaflets sessile
http://www.illinoiswildflowers.info/savanna/plants/cm_dewberry.htm
has 5 flowered inflorescence