Entomophilous, or ornithophilous. Inflorescence, floral, fruit and seed morphology . Flowers solitary, or aggregated in 'inflorescences'. Inflorescences terminal, or axillary. Free hypanthium absent.
Corolla lobes markedly shorter than the tube to markedly longer than the tube.
Androecium exclusively of fertile stamens. Endothecium not developing fibrous thickenings. Anther epidermis persistent. Polar nuclei fusing prior to fertilization. Synergids with filiform apparatus.