340 BOTANICAL GAZETTE [april 





bud-scales of Fatsia. In the garden hyacinth, for instance, the leaves 

 may often be found to terminate in a short, solid, cylindrical apex 

 (fig. 2 A). On cutting sections of this apex, a ring of bundles is 

 revealed (fig. 2B), so that not only the external appearance of the 

 apex but also its anatomy corresponds to that of the Fatsia bud- 

 scales. Precisely the same thing has been found in another of the 

 Scilleae, a garden variety of S cilia; the transverse section of the 

 apex of this leaf is shown in fig. 3. In a second sub tribe of 

 the Lilioideae, the Tulipeae, a conspicuously developed, solid apex 

 may be observed, for instance, in the leaf of Tulipa sylvestris L. 

 Sections of this apical region again reveal a typically petiolar struc- 

 ture. Fig. 4 is drawn from a section at the base of the apical 

 region, and shows, in its form, the last traces of the influence of 

 the limb, but higher up this irregularity disappears, and the apex 

 becomes approximately cylindrical. 



Such leaves as those of H enter ocallis, on the other hand, perhaps 

 may be compared with the countless dicotyledonous bud-scales in 

 which reduction has been carried still farther than in Fatsia, so 

 that they retain no vestige of any part of the leaf except the sheath- 

 ing base* 



Summary 



It is shown on evidence of ontogeny and comparative morphol- 

 ogy that certain leaves among the Liliaceae, such as those of H enter 0- 

 callis and Scilla, are to be interpreted as equivalent to leaf-bases. 

 The lamina is entirely absent, and the petiole is either also absent 

 or is present in an extremely reduced form. The solid, approxi- 

 mately cylindrical apices in which the leaves of Hyacinthus, Tulipa , 

 etc., sometimes terminate, are held to represent the last rudi- 

 mentary phase of the vanishing petiole. 



Balfour Laboratory 

 Cambridge, England 



LITERATURE CITED 



i. Arber 



special reference to anatomical evidence. Ann. Botany 32:465-5 01 - I91 ?' 



2. Domin, K., Morphologische und phylogenetische Studien iiber die Familie 

 der Umbelliferen. Bull. Int. Acad. Sci. Prague 13: 108-153. pis. IS- i9 o8 5 

 14:1-52. pis. 4, 5. figs. jo. 1909. 



3. ., Morphologische und phylogenetische Studien iiber die Stipular- 



bildungen. Ann. Jard 



1911 



