Peristrophe

Herbs or subshrubs, sometimes scrambling or procumbent, and rooting at nodes. Leaves entire. Inflorescence axillary, umbel-like group of monochasial cymes; primary bracts foliaceous, secondary bracts usually linear-lanceolate, tertiary bracts ovate, elliptic, or linear-lanceolate, quaternary bracts linear-lanceolate. Calyx regular; lobes 5, linear-lanceolate; tube shorter than lobes. Corolla 2-lipped, resupinate, hairy; upper lip 3-toothed or shortly 3-lobed, rugula indistinct; lower lip entire or emarginate; aestivation ascending; tube shorter than lobes, cylindric below, somewhat campanulate above. Androecium: fertile stamens 2, arising in corolla throat, exserted; filaments linear, thinly hairy; anthers 2-thecous; thecae superposed, muticous; staminodes 0. Pollen prolate, 3-colporate, with pseudocolpi; surface reticulate. Disc cupular, with V-shaped slit, with 2 awns. Gynoecium: ovary ellipsoid, with 2 ovules in each locule; style filiform, exserted; style branches 2, equal, cylindriform, longer than broad. Capsule stipitate, with inelastic placental bases. Seeds discoid; surface rough and tuberculate. x = 10 (polyploidy).