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It is a dark grey, pubescent, glandular-hairy perennial plant with a woody base. Stems are branched, ascending or decumbent, sometimes sparsely villous or hispid. Leaves are 2-9 x 0.3-0.8 cm, linear-lanceolate, entire, undulate, acute to obtuse, and cuneate; lower leaves are petiolate, while the upper are sessile. Flowers are blue with purple spots, tubular and are arranged in terminal, forked spike-like, dense cymes. The fruit is of 2 ovoid, rugose-tuberculate nutlets, enclosed by the persistent calyx ovoid with retuse or notched apex.