Cross-section round. Outline smooth. Culm center with net-like parenchyma cells (aerenchyma). Epidermis with hairs. Continuous peripheral sclerenchymatic belt. Large vascular bundles in 2-3 rows. Small vascular bundles integrated in the sclerenchymatic be
Outline wavy. Upper epidermis cells in one row. Vascular bundles near the upper side of the leaf. Girders extending from the vascular bundle to the lower side of the leaf.