6. Peristrophe Nees in Wall., Pl. Asiat. Rar. 3: 77, 112. 1832. in DC., Prodr. 11: 492. 1847; Benth. & Hook. f., Gen. Pl. 2: 1121. 1876; Clarke in Hook. f., Fl. Brit. Ind. 4: 554. 1885; Ridley, Fl. Mal. Penin. 2:609. 1923.
KAMAL AKHTAR MALIK & ABDUL GHAFOOR
Erect to spreading herbs or undershrubs with opposite, entire leaves. Flowers showy, solitary or in lax trichotomously branched paniculate cymes, pink or rose coloured, bilabiate; bracts linear or ovate, longer than the calyx; bracteoles paired, linear-lanceolate, shorter than the bracts. Calyx deeply 5-loed, lobes linear-lanceolate, all equal. Corolla hairy, tube slender, twisted, as long as or hardly longer than the 2-lipped limb, lobes imbricate in but; upper lip shorter than the lower, subentire; lower lip shortly 3-lobed. Stamens 2, attached to corolla throat, free, equal, well exserted, filaments hairy below, anthers dithecous, muticous, lobes rotund, unequal, superposed, staminodes absent. Ovary bilocular, each locule 2-ovuled; style filiform, stigma ± 2-lobed. Capsule oblong-ellipsoid, stiped, 4-seeded, ± pubescent. Seeds compressed, ovoid-orbicular, papillate, glochidiate or smooth, without hygroscopic hairs.
A genus of c. 30 species distributed from East Malaysai to Tropical Africa. Represented by a single species in Pakistan.