Justicia petiolaris is a perennial with stalked lanceolate leaves. It grows to 1 m. in the north-east of South Africa, including the coastal areas. The distribution area extends further north into tropical Africa. The habitat is woodland and forest margins, often in semi-shade. The calyx has five green pointed lobes. The corolla is two-lipped. The upper lip is small, holding the two stamens in a tiny channel. The lower one is large and three-lobed. The corolla is light blue and white. Blooming lasts through summer and autumn. Some of the justicias are used in traditional medicine (Manning, 2009; www.plantzafrica.com).