Hypocrateriform

Corolla gamopetalous, tubular-campanulate, infundibuliform, campanulate or hypocrateriform, sometimes with bilabiate apex, aestivation imbricate, zygomorphic; stamens included or exserted, 4, rarely reduced to 2, didynamous, staminode reduced, glabro, rarely elongate and pilose; filaments adnate to the corolla at the base; anthers commonly divergent, generally glabrous, rarely pilose; pollen grains many, in monads, rarely in tetrads or polyads; nectariferous disk generally present; gynoecium bicarpellate, bilocular; ovary superior, multiovulate, placentation axial, stigma bilamelate, lobes sensitive (closing after contact with pollinator).