Cross-section triangular. Outline with rips. Culm center with net-like parenchyma cells (aerenchyma). Recognizable epidermis cells. Peripheral sclerenchymatic stabilisation structure (girders) rectangular. Large vascular bundles in one row. Solitary large
Outline with rips. Upper epidermis cells in several rows. Vascular bundles near the lower side of the leaf. Girders extending from the vascular bundle to the lower side of the leaf.