On the Leaf Structure of certain Liliaceae, considered 
in Relation to the Phyllode Theory. 
BY 
AGNES ARBER, D.Sc., F.L.S., 
Keddey Fletcher-Warr Student of the University of London. 
With thirty-eight Figures in the Text. 
Contents. 
PAGE 
Introduction 447 
I. , The Leaf-base Phyllodes of Anemarrhena (Asphodeloideae) .... 447 
II. The Petiolar Phyllodes of Asphodelus and Eremurus (Asphodeloideae) . 449 
III. The Petiolar Phyllodes of the Johnsonieae (Asphodeloideae) . . . 452 
IV. The Leaves of Allium and Brodiaea (Allioideae) 456 
V. The Leaves of Astelia and Dasylirion (Dracaenoideae) . ... 461 
VI. The Leaf-anatomy of Ophiopogon (Ophiopogonoideae) 463 
Acknowledgements 464 
Alphabetical List of Memoirs cited ..... ... 465 
Introduction. 
I N a memoir 1 published in the ‘ Annals of Botany * in 1918, I traced the 
general results which seemed to me to follow when the Phyllode Theory 
was applied to the interpretation of the Monocotyledonous leaf. The 
present paper forms one of a subsequent series 2 in which I am attempting 
to deal in further detail with the evidence concerned, and also to follow out 
various lines of thought — in part already indicated in my 1918 paper — - 
which arise when the leaf is considered from this standpoint. In this 
instalment I propose to discuss certain selected cases among the Liliaceae. 
I. The Leaf-base Phyllodes of Anemarrhena 
(Asphodeloideae). 
In a recent paper in the ‘ Botanical Gazette ’ 3 I have interpreted certain 
leaves among the Liliaceae, such as those of Hemerocallis and Scilla , as 
reduced to leaf-bases alone. I have pointed out that there is some 
evidence for this view in the fact that the petiole — though here entirely 
lost-may, in the case of the closely similar leaves of Hyacinthus and 
1 Arber, A. ( 1918 ). 2 Ibid. ( 1919 , 1920 1 , 1920 2 ). 
8 Ibid. ( 1920 1 ). 
[Annals of Botany, Vol. XXXIV. No. CXXXVI. October, 1920. j 
