considered in Relation to the Phyllode Theory. 
457 
Figs. 22-27. Leaf structure of Allium (xylem, black; phloem, white). Figs. 22 A-C, Allium 
Porrum , L. (Sect. Porrum ). Fig. 22 a, junction of sheath and limb, with ligule, lig. (| nat. size). 
Fig. 22 b, transverse section of part of limb, not including midrib ( x 9, circa) ] i.b. = inverted bundle ; 
a.p. = assimilating parenchyma. Fig. 22 c, transverse section close to apex of limb, to show survival 
of inverted bundles, i.b., in this region ; h. = marginal hairs ( x 23). Figs. 23 a-d, Allium fistulosum , 
L. (Sect. Schoenoprasum). Fig. 23 A, leaf (| nat. size) to show upper part of sheath, s., ligule, lig., 
and limb. Fig. 23 B, transverse section of sheath ( x g\, circa). Fig. 23 c, transverse section of limb 
(x 5|, circa)] i.b . = inverted bundle. Fig. 23 d, transverse section of flattened apical part of limb 
( x 14). Figs. 24 A and b, Allium Schoenoprasum , L. Fig. 24 A, transverse section of sheath ( x 23). 
Fig. 24 B, transverse section of limb ( x 23). (Note in both cases relative unimportance of midrib, m.b ., 
as compared with main laterals, l v and l 2 .) Figs. 25 A and B , Allium victorialis , L. (Sect. Rhi- 
ziridium ). Fig. 25 A, junction of limb and sheath showing ligule, lig. (| nat. size). Fig. 25 b, 
transverse section of midrib region of limb ; i.b. - inverted bundle ( x 8|, circa). Figs. 26 A and b, 
Allium carinatum , L. (Sect. Macrospat ha). Fig. 26 A, junction of sheath and limb Q nat. size). 
Fig. 26 B, transverse section of limb near its junction with sheath (x 8|, circa). Fig. 27, Acacia 
leptospermoides , Benth. Transverse section of phyllode ( X 14) for comparison with Allium kstulosum 
(Fig. 23D); a.p. = assimilating parenchyma; i.b. = inverted bundles. 
