100 



A. H. Graves, 



In shape the floral scale leaf differs considerably from the vege- 

 tative scale leaf. It is shorter, almost symmetrical^ oblong and 

 emarginate (PL VII, fig. 42 ; Text-fig. 19, fsl). 



The internal structure is identical with that of the vegetative 

 scale leaf. 



3. Orientation of Scale Leaves in Floral Region. 



The plan of a typical arrangement in the floral region is represen- 

 ted in Text-figs. 19—20. Here we find the members occurring in the 

 following order, proceeding from right to left : — 



Figure 19. — Portion of the plant near the floral region, showing the two 

 kinds of scale leaves and the subfloral leaves. The parts are somewhat 

 separated so that they may be seen more clearly, low. sfl. lo"wer sub- 

 floral leaf ; axbr., axillary branch ; wi-/, vegetative scale leaf ; ped., peduncle ; 

 fsl., floral scale leaf; up. sfl, upper subfloral leaf, x 6. 



Figure 20. — Cross section through flower bud, below flowers, show^ing parts 

 represented in figure 19. Abbreviations as in figure 19. x 35. 



1. The lower subfloral leaf {low, sfl). sheathing the entire flower bud ; 



2. The branch [axbr), arising in the axil of this leaf; 



3. The vegetative scale leaf {vsl), enveloping this axillary struc- 

 ture and borne at its base on the side furthest removed from the 

 subtending subfloral leaf; 



4. The peduncle {ped), bearing the flowers; 



exception to the general rale. If such cases could be found, showing 

 a normal floral scale leaf, this -vs^ould prove that the scale leaf is borne 

 on the peduncle and not on the axillary bract. 



