Vessel end-walls simple. Reproductive type, pollination . Inflorescence, floral, fruit and seed morphology . Inflorescences axillary, or cauliflorous. Free hypanthium absent.
Corolla lobes markedly longer than the tube.
Androecium 4, or 5. Androecium exclusively of fertile stamens. Endothecium developing fibrous thickenings. Anther epidermis persistent. The initial microspore tetrads tetrahedral.