Draba rigida var. imbricata

A classy little alpine growing as small, slow-growing buns of bright green which send up thread-like, wiry stems in spring carrying heads of golden flowers. When well-grown the stems stick out in every direction giving a pincushion effect. It's an excellent plant for growing in a stone trough or tucked into a wee crevice between stones.

It needs free-draining soil and in areas of high rainfall it is probably better to shelter it a little from the heaviest of winter rain - in the south and east of the U.K. it should be fine. It's very hardy. 

We first saw this (and fell in love with it) many years ago, growing happily (unprotected) on the famous rock garden at Edinburgh Botanic Gardens.