405 



The stem of R. Pallasii essentially agrees in structure with 

 that described for R. lapponicus. The stem is rounded and 

 somewhat inflated; in the horizontal portion stolons arise from 

 the axils of the two-rowed, distant leaves; the first leaf of the 

 shoot has often only a short internode. I do not think there 

 is any true principal shoot. The uppermost leaf, which is 

 smaller than the others upon the main axis, often subtends a 

 horizontal stolon or, as in the herbarium-specimen, one with 



Fig. 46. R. Pallasii. 



A. A specimen about Vi. The axes are indicated by Roman numerals I, II, III; the 



leaves by aj, bj, etc. ajj, bjj, etc.; Cj has been cut off. B- The upper part of a plant 



with a flower (about ^/i). C, shows a young nutating leaf the sheath of which surrounds 



the apex of the shoot (about Vi)- 



a somewhat downward tendency, always shorter than those which 

 proceeded from the lower leaves. The uppermost leaf may also 

 subtend a floral-axis which bears a leaf without axillary flower. 

 Adventitious roots arise within the nodes of the shoot during 

 the first summer but as a rule they probably do not emerge 

 until the next summer, when the shoot flowers (Fig. 46). It is 

 not probable that the individual shoot-generations live more 

 than two summers. The plant probably passes the winter in a 

 similar manner to R. hyperboreus. 



