Free hypanthium absent. Androecium exclusively of fertile stamens. Carpels reduced in number relative to the perianth to isomerous with the perianth. Ovary 1 locular. Placentation free central.
Cotyledons connate into a tube enclosing the plumule.
Physiology, biochemistry . Anatomy non-C4 type. Peculiar feature . Geography, cytology . Paleotropical and Australian.