FOREX-Euro heads for worst week in 2 yrs, ECB weighed

* Dollar rally gathers steam, dlr index at 1-month high

* Euro heading for biggest weekly loss vs dlr in 2 years

* ECB rate hike outlook tempered by Stark, Lagarde

* Peripheral jitters on Irish EU reform referendum

(Changes byline, adds quotes, updates prices)

By Toni Vorobyova

LONDON, June 12 (Reuters) - The euro was on track for its worst week versus the dollar in two years on Thursday, hurt by tempered expectations of euro zone rate hikes and political jitters surrounding Ireland's referendum on EU reforms.