Vessel end-walls simple. Reproductive type, pollination . Inflorescence, floral, fruit and seed morphology . The floral irregularity involving the androecium, or involving the perianth and involving the androecium. Free hypanthium absent.
Calyx lobes markedly shorter than the tube.
Androecium 4, or 5. Androecium exclusively of fertile stamens, or including staminodes. Pollen shed as single grains. Gynoecium 2 carpelled. Carpels reduced in number relative to the perianth.