Silene regia Sims
Family: Caryophyllaceae
royal catchfly, wild pink
Silene regia image
from USDA Plants website  
Etymology: Silene: probably from Greek sialon, "saliva," referring to gummy exudation on stems, and/or named for Silenus, intoxicated foster-father of Bacchus (god of wine) who was covered with foam, much like the glandular secretions of many species of this genus.
Conservation Status: Introduced - adventive