Whin

1790, Robert Burns, Tam o' Shanter, 1828, Thomas Park (editor), Works of the British Poets, Volume XX: The Poems of Robert Burns, page 65, By this time he was cross the ford, / Whare in the snaw the chapman smoor'd; / And past the birks and meikle stane, / Whare drunken Charlie brak's neck-bane; / And through the whins, and by the cairn, / Whare hunters fand the murder'd bairn; / And near the thorn, aboon the well, / Whare Mungo's mither hang'd hersel.

Source: wiktionary

And sometimes they clambered down […] and saw the whin bushes climb black the white hills beside them and far and away the blink of lights across the moors where folk lay happed and warm.

Source: wiktionary