Herbaceous, softly twiner; stem thinly hairy; leaves ovate, sagitate or oblong at base, entire or remotely dentate, acute at apex, pubescent above, densely so beneath, 5-nerved; petioles often prominently winged; flowers axillary, solitary or paired, long pedicellate; bracts rigid, ovate or hastate, acute, glabrous, folded in the middle like a wing; bracteoles-2, broadly ovate; calyx-teeth 10-16, linear or subulate, unequal, ciliate; corolla orange with a purple or scarlet eye, lobes-5, spreading, tube slender, oblique or curved; stamens-4, didynamous, inserted near the base of tube, included, filaments usually hairy, anthers 2 celled; cells unequal, shortly spurred or not; disk annular or cushion–shaped; ovary 2 locular; ovules 2 in each locule, style long, stigma entire 2 fid or fringed; capsules globose, beaked, villous; seeds 4, ovoid, dorsally compressed, not hairy.