Stem anatomy . Internal phloem absent. Vessel end-walls scalariform, or scalariform and simple. Vessels without vestured pits. Reproductive type, pollination .
Fertile flowers hermaphrodite .
Inflorescence, floral, fruit and seed morphology . Flowers solitary, or aggregated in 'inflorescences'. The floral irregularity when noticeable, involving the androecium. Flowers partially acyclic . The perianth acyclic, or the androecium acyclic, or the perianth acyclic and the androecium acyclic.