452 Arber. — On the Leaf Structure of certain Liliaceae, 
structure distinctly recalls the horizontally expanded phyllode of Acacia 
leptospermoides , Benth. (Fig. 27, p. 457). 
The leaf of Eremurus kimalaicus , Benth., like that of Asphodelus 
ramosus , does not externally suggest a phyllodic anatomy, but it is found 
to include both normal and inverted bundles. Fig. 13 A, p. 451, shows the 
transverse section of the leaf near its apex, while Fig. 6, p. 479 of my previous 
paper, 1 represents the structure of the main part of the leaf. The most 
striking feature of the leaf of Eremurus himalaicus is that there can scarcely 
be said to be, anatomically, any distinct leaf-sheath region — assuming the 
absence of inverted bundles to be one of the marks of a sheath. Serial sections 
through the stem apex show that both normal and inverted bundles continue 
to the extreme base of the leaf. This is also the case with the sheathing 
scale leaves which clothe the leaf-bud externally. In these the inverted 
bundles persist to the base, though they are less numerous than in the 
foliage leaves (Fig. 13 b). It is possible to take the view that in Eremurus 
there is more or less complete fusion between the leaf-base and the axis. 
On the other hand, it must be conceded that we need not necessarily exclude 
an organ from the category of leaf-sheaths or leaf-bases because of its 
possession of inverted bundles ; for some years ago Worsdell 2 pointed out 
that, in Thalictrum flavum , L., the inverted bundles characteristic of the 
petiole persist downwards at least into the upper part of the leaf-sheath 
region. I have- been able to confirm this, and the occurrence of these 
inverted bundles (i.b) is indicated in Fig. 12. 
III. The Petiolar Phyllodes of the Johnsonieae 
(Asphodeloideae). 
The Johnsonieae are a group of highly xerophilous Australian 
Liliaceae. Schulze 3 gave some account of their leaf structure in his general 
work on the anatomy of the Family, but as his descriptions suggest 
a definitely phyllodic type of structure, and as he paid more attention to 
minute histological detail than to the general features of the vascular 
system, it seemed worth while to make a further study of the Tribe. I have 
been able to examine, in the herbarium of the Cambridge Botany School, 
material of leaves representing six of the seven genera of Johnsonieae 
(, fohnsonia , Arnocrinum , Laxmannia , Borya , Alania, and Sower beia), 
Stawellia being the only one which was inaccessible. 
The main feature of the leaf anatomy of the Johnsonieae, as Schulze 4 
points out, is a tendency towards the aggregation of the bundles into 
a central vascular cylinder, enclosed in a common parenchymatous sheath. 
The structure thus produced seems to me to be strongly reminiscent of 
petiolar anatomy, and the Johnsonieae thus appear to offer a particularly 
1 Arber, A. (1918). 2 Worsdell, W. C. (1908). 
3 Schulze, R. (1893). 4 Ibid. 
