Reclining St. Andrew's Cross (Hypericum stragulum) 2016-8-8 Newark, DE

native
in the St. John's Wort family

(Be on the lookout for St. Peter's Cross, H. crux-andreae which likes damp ground. Its stems are winged and the leaves are wider.)

http://www.carolinanature.com/trees/hyst.html
"Similar to the closely related Hypericum hypericoides (also known as St. Andrew's Cross), but with a more sprawling habit. The narrow leaves are widest towards the tip, while those of H. hypericoides are wider towards the middle."

note to self: there are stragulum/hypericoides naming issues

http://plants.usda.gov/core/profile?symbol=HYHYM
shows this as:
St. Andrew's cross Hypericum hypericoides (L.) Crantz subsp. multicaule (Michx. ex Willd.) N. Robson
and has no images

IPNI lists as H. stragulum