It is a hairless herbaceous evergreen plant. With erect and quadrangular stems, reaching up to 43 cm in height. The leaves are sessile, elliptic, ovate or obovate, up to 30 x 22 mm, rounded at the apex, cordate or subcordate at the base. The flowers are in corymbose cymes. The sepals are lanceolate and the petals are 1 cm long, yellow with marginal black dots. The fruit is a capsule with 3 valves.