Cross-section round. Outline smooth. Culm center with net-like parenchyma cells (aerenchyma). No visual difference between epidermis cells and sclerenchyma cells. Large vascular bundles in 2-3 rows. Small vascular bundles integrated in the sclerenchymatic
Outline wavy. Upper epidermis cells in one row. Epidermis with spikes. Vascular bundles centered between the upper and lower side of the leaf. Girders extending from the vascular bundle to the lower side of the leaf.