Cross-section round. Outline smooth. Culm center filled. No visual difference between epidermis cells and sclerenchyma cells. Peripheral sclerenchymatic stabilisation structure (girders) rectangular. Large vascular bundles in one row. Solitary large vascu
Outline wavy. Upper epidermis cells in several rows. Vascular bundles near the upper side of the leaf. Girders extending from the vascular bundle to the lower side of the leaf.