^2 



Knud Jessen. 



growth in vigour before they flower, but I have not been 

 able to investigate such shoots in the material at my disposal, 

 therefore I shall only deal with the propagative shoots formed 

 by the stems. 



In correlation with the fact that vegetative propagation 



LJj 



Fig. 35. Rubus arcticus. 



A, Portion of root with a shoot-complex arising from it. The first leaf of 

 the lateral shoots is marked with ax (Arctic Norway, July, 1885 ; Vi) \ drawn 

 by Eug. Warming (1. c). B, A plant which had been growing in a sphag- 

 num-bog in the province of Quebec in Canada, Aug., 1907 ; I, the stalk of 

 a foliage-leaf; s, propagating shoot; (slightly above nat. size); drawn from a 

 specimen in the Botanical Museum in Copenhagen. 



is effected by the roots, the plant has one kind of shoot only, 

 viz. assimilatory floral-shoots which have a two years devel- 

 opment. In the first year an erectly ascending, and when 

 the plant is growing in dry soil, short propagating shoot is 



