Cross-section triangular. Outline with rips. Culm center with net-like parenchyma cells (aerenchyma). No visual difference between epidermis cells and sclerenchyma cells. Peripheral sclerenchymatic stabilisation structure (girders) conic. Large vascular b
Outline wavy. Upper epidermis cells in several rows. Vascular bundles near the lower side of the leaf. Girders extending from the vascular bundle to both sides of the leaf.