considered in Relation to the Phyllode Theory. 
o 1 o 
Leaves of Ins ( SectionsXiphium and J uno 
Figs. 31-5. Figs. 31 a-d, Iris xiphioides, Ehr. ; Figs. 31 A and B, apical region of two 
leaves seen from ventral side ( x |) to show variation in length of cylindrical apex (pet.) which 
terminates the bifacial region ( sh .) ; Fig. 31 C, transverse section bifacial region (x 14) ; Fig. 31 I), 
transverse section limb at uppermost limit of junction of sheath (sh.) and limb ( X 14). Figs. 32 a 
and B, /. Xiphium, L. ; Fig. 32 a, transverse section sheath ; Fig. 32 B, transverse section apical 
limb; (x 14). Fig. 33, I. filifolia, Boiss. (x 11, circa). Figs. 34 A and b, I. Kolpakowskiana , 
Regel ; Fig. 34 a, transverse section leaf (x 23); Fig. 34 b, transverse section nearer apex (x 24, 
circa) ; the epidermis is thickened and papillose, but this is not shown in these diagrams. Figs. 35 a 
and b, I. orchioides, Carr. ; Fig. 35 A, transverse section leaf ( x 14) ; Fig. 35 B, midrib region of 
Fig. 35 a (x 77, circa). Note contrast between lignified fibres, f x , and non-lignified hypodermal 
fibres, / 2 . 
