Vascular bundles of the stem are usually scattered or borne in 2 or more rings. The mature root system is completely adventitious. A single cotyledon is present or the embryo sometimes undifferentiated. Leaves are mostly parallel or parallel-derived veined. Floral parts are typically borne in sets of 3, seldom 4, and almost never 5.
Pollen is uniaperturate or uniaperturate-derived.