Mouse-ear Chickweed
Cerastium fontanum,

f16 @ 1/1000s, ISO:1000, Nikon D3S w 105mm macro and qty 2 SB-R200 flashes

"Cerastium fontanum," Wikipedia, the free encyclopedia. Cerastium fontanum, also called mouse-ear chickweed, common mouse-ear, or starweed, is a species of mat-forming perennial or, rarely, annual plant. It is native to Europe but introduced elsewhere. Its identifying characteristics are tear-shaped leaves growing opposite one another in a star pattern, hairy leaves, and small white flowers. Mouse-ear chickweed typically grows to 4"-8" tall and spreads horizontally along the ground via the formation of roots wherever the stem falls over and contacts the ground.
Francis A. Crane Wildlife Management Area, East Falmouth, Massachusetts