Dianthera incerta is a species of perennial herb in the Acanthus family commonly known as the Cape tube-tongue or chuparrosa. D. incerta is characterized by solitary, pink, two-lipped tubular flowers up to 27 mm (1.1 in) long that emerge from the leaf axils. It is endemic to the Cape region of Baja California Sur, and was formerly placed within Justicia. It is most similar to other species formerly placed in Siphonoglossa, such as Dianthera sessilis of the West Indies and South America.