Rosaceæ. 



75 



short. In conformity to this the rhizomes which persist for 

 several years are shaped very differently. The scale-leaves 

 are two-rowed as are the leaves of this species generally. 

 There appears to 

 be a difference be- ^ 

 tween the upper 

 and lower rejuv- 

 enating shoots, 

 only the upper 

 having been found 

 to be floral, and 

 those of them, 

 which had not 

 been proleptically 

 developed in the 

 same year as the 

 parent-shoot, de- 

 velop at the end 

 of summer flower- 

 buds for the next 



year (Fig. 29, A, 

 C). I have not 

 found flower-buds 

 on the lower and 



longer shoots. 

 Next year the 

 flower-buds pro- 

 duce first 2 — 6 

 foliage-leaves and 

 then the flowers 

 expand, but the 

 vegetative pro- 

 pagating shoots 

 produce first an 



Fig. 29. Rubus saxatilis. 



A, Shoot-base from Denmark (Oct. 22, 1912). The plant 

 has been growing in loose leaf -mould and has therefore 

 especially elongated internodes. The lateral shoot a was 

 floral and would have flowered in the summer of 1913, while 

 the two other shoots, at any rate the strongest, 6, would 

 have produced assimilatory and wandering shoots. The buds 

 о and Ъ reached the surface of the ground. Lowermost in 

 the figure is seen the upper part of the shoot from 1911 ; 

 there are dormant buds in the axils of the scale-leaves 

 (shghtly above natural size). B, Stolon-ape.x from Denmark 

 (Oct. 1912). Just at the point where the stolon bends the 

 axis is somewhat thickened, and from here numerous 

 vigorous adventitious roots arise (slightly above natural size). 

 C, Longitudinal section through the bud a in Fig. A ; the 

 exterior of the stamens well -developed, but the pollen was 

 found not to have developed yet ; nor had the ovules begun 

 to develop in the carpels (*°/i). 



