Main characters observed in the leaf cross-sections and abbreviations. Lines in grey indicate measures: 1 length (only in species with conduplicate blades) 2 maximum width 3 thickness of the blade at the midrib 4 maximum size/diameter of the median vascular bundle (MVB) 5 length × width of abaxial epidermal cells (AbEC) 6 length × width of adaxial epidermal cells (AdEC). Sclerenchyma (SCL); vascular bundles (VB’sVB’s); ribs (R); trichomes (TRI); outer bundle sheath cells (OBS); and inner bundle sheath cells (IBS).