Cross-section round. Outline wavy. Culm center with net-like parenchyma cells (aerenchyma). Recognizable epidermis cells. Large vascular bundles in one row. Solitary large vascular bundles. Large and irregular cavities (aerenchyma). Chlorenchyma absent.
Outline wavy. Upper epidermis cells in one row. Epdermis lignified. Vascular bundles centered between the upper and lower side of the leaf. Large cavities.