- Leaves simple, alternate, wih sheathing base and long lateral veins paralleling midvein.
- Bamboos with short petiole, woody, joined stems, either hollow or solid.
- Flowers and fruits typical of grasses.
Diagnosis: Herbs, shrubs, and sprawling climbers, leaves narrow with numerous secondary veins paralleling the midvein, leaf base often sheathing the stem, nodes often expanded giving a jointed appearance (bamboo-like).
|Arecaceae||: leaves usually compound; if simple then venation pinnate.
|Cycadaceae||: leaflets with spiny margins, short 4-8 mm spines on petiole.
Diversity: Total: 33 genera, 70 species. Woody bamboos: 3 genera, 7 species.