Stem anatomy . Young stems cylindrical. Internal phloem absent. Included' phloem absent. Reproductive type, pollination .
Fertile flowers hermaphrodite .
Inflorescence, floral, fruit and seed morphology . Free hypanthium absent. Corolla lobes markedly shorter than the tube. Androecium exclusively of fertile stamens. Carpels reduced in number relative to the perianth to isomerous with the perianth.