Cross-section triangular. Outline wavy. Culm center hollow. Epidermis with papillae. Recognizable epidermis cells. Peripheral sclerenchymatic stabilisation structure (girders) rectangular. Large vascular bundles in one row. Solitary large vascular bundles
Outline wavy. Upper and lower epidermis cells of equal size and shape. Upper epidermis cells in one row. Vascular bundles near the lower side of the leaf. Girders extending from the vascular bundle to both sides of the leaf.