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Corolla subrotate, 5-lobed; limb weakly bilabiate but not separated into galea and lip.
Leaves opposite, sessile, crenate or serrate, decreasing in size above.
Stamens 4, didynamous; anther thecae 2, equal, parallel, mucronate.
Flowers solitary, axillary, shortly pedicellate, ebracteolate.
Seeds numerous, white, longitudinally winged.
Style simple, filiform; stigma entire.
Calyx 4-lobed; lobes straight.
Capsule ovoid.