Wall Lindenbergia is an annual herb, 10-40 cm tall. This wall and rock-loving plant varies from being hairy to nearly hairless. Primary root undeveloped, lateral roots numerous and fibrous. Cylindrical stems are simple or often branched, straight or ascending. Leaf stalk is slender, hairy; leaf blade ovate, 2.5-6 cm, thin, nearly membranous, finely hairy or hairless, base wedgeshaped. The leaf margin away from the base has rounded teeth. Tip is acute to obtuse. Flowers solitary in leaf axils. Pedicel 1-5 mm, hairy. Calyx 4-5 mm, densely hairy; tube membranous, somewhat white; sepals equal, oblong-ovate. Flowers yellow, 8-9 mm; tube slightly longer than sepals, hairy; limb subglabrous; lower lip conspicuously creased, petals oblong-ovate, subequal, and apically obtuse; upper lip truncate, emarginate. Anthers circular, stalked. Ovary and style densely covered with long hairs. Stigma spherical, hairless. Capsule ovoid-spherical, to 5 mm, densely hairy. Seeds yellow, 0.5-0.7 mm. Flowering: July-October.