Barleria macrostegia is a trailing perennial herb, with much-branched, prostrate stems, reaching a length up to 500 mm. The branches are hairy and develop out of a woody rootstock. The leaves are opposite, oblong or elliptic and the leaf margins are wavy with long white hairs, the leaves tapering at the base and the apex (leaf tip), ending in a sharp point. The blue flowers appear from summer into autumn.
Barleria macrostegia does well in a hot, sunny spots in the garden, for example in a xerphytic garden.