Cross-section round. Outline smooth. Culm center hollow. No visual difference between epidermis cells and sclerenchyma cells. Continuous peripheral sclerenchymatic belt. Large vascular bundles in one row. Small vascular bundles integrated in the sclerench
Outline with rips. 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.