180 



which is fully developed (Fip. C). Sometimes, however, besides 

 tlie terminal flower, normal flowers are also found to occur on 

 one or two of the uppermost lateral branches of the inflores- 

 cence (Fig. 9 ^). 



Rhizomes may be found which have internodes elongated 

 to an unusual extent, several cm. in length (they have probably 

 grown between moss or in shifting sand), and these afford an 

 example of the fact that scale-leaves may both precede and 



Fig. 7. Saxifraga cernua. 



A, B, Bulbili, probably from an inflorescence, germinating. 



C, A bulbil from an inflorescence with its covering of glandular hairs. 



D, A bulbil of an inflorescence; the hairs are omitted. E, The lamina of a basal leaf. 



F, Scale-leaf from the bulbil of a rhizome. (E. W., 1886.) 



succeed the foliage-leaves (Fig. 6 E). The formation of scale- 

 leaves indicates probably that the plant has a winter-stage. 

 Horizontally-growing, slender runners, several cm. in length, 

 which bear scale leaves, also occur. 



In the inflorescence the bulbils are dark-red ; otherwise 

 they are white, and consist of small, thick, solid scale-leaves 

 (Figs. 6 and 7) containing starch, which are homologous with the 

 bases of the foliage-leaves , and often have at their apex a 

 small lamina, which, however, in most of them, is very incon- 



