Resprouting shrublet up to 40cm, flowering mostly in first year after fire; branches have dense white or silver hairs. Leaves 1-foliolate, elliptic, hairy, margins scabrous; stipules hairy; purple-blue flowers; calyx densely black and white-hairy.

After: Dr G. Thom (1789-1842), Scottish minister of the N.G. Kerk, who sent botanical specimens to Glasgow University