Leaf anatomy of Cortaderia, as evident from transverse sections. A–B C. selloana (Villamil 11738) C C. speciosa (Testoni 644) D C. vaginata (Zanín 1654). Comparison of bulliform cells in Egmontiana group: E C. egmontiana (Testoni 634) F C. modesta (Carauta 927) G C. vaginata (Zanín 1654). Structures referred to in the descriptions are labelled as follows: 1, multi-layered abaxial sub-epidermal collenchyma layer; 2, aerenchyma; 3, chlorenchyma; 4, primary vascular bundle; 5, midrib; 6, colourless cells; 7, empty cells; 8, bulliform cells.