European Gardening: Help ID plant in Western Ireland, 1 by GreenAtHeart

GreenAtHeart wrote:
We were in County Clare in September and encountered many blooming plants that looked familiar - but just not quite the same as at home in the States (zone 5). This is a picture of one of them. These hedges lined rock walls and roadways and yards. They were in the towns and countryside in great numbers - often elbowing for space with the ripe brambles; about six to eight feet tall. Thanks for a name..
Louise