Ruellia tuberosa L.
Linnaeus, C. (1753) Species Plantarum Edn. 1, 2: 634. Type: Habitat in Jamaica.
Herb 40-60 cm tall. Stems clothed in hairs and longitudinally ridged.
Two types of flowers produced, i.e. normal flowers and small cleistogamous flowers. Calyx about 15-25 mm long, the lobes linear and clothed in hairs. Corollas in normal flowers consist of a tube about 22-40 mm long and lobes about 10-18 mm long, while in cleistogammous flowers the corolla lobes are only 4-6 mm long. Staminal filaments dimorphic, about 4.3 or 8.5 mm long. Styles in normal flowers about 21 mm long.
Fruits cigar-shaped, calyx persistent at the base, about 18-20 x 3 mm, exploding at maturity. Seeds about 24 per fruit. Each seed about 18-22 x 2-2.5 mm, clothed in hairs.