Nutritiun Favors the Anuiualy 



313 



for this the disposition of the leaves of Lysiinachia vul- 

 garis (Fig. 59). This species has opposite leaves as 

 a rule, but often occurs with quaternary and ternary 

 whorls. With regard to this character the species he- 

 haves as a half race, in this neighborhood at any rate. 



If we examine the rhizome in the spring we find tlie 

 vegetative buds growing vertically upwards under the 

 top soil or moss and ready for sprouting. At this period 

 it can easily be seen that all of the buds have their scales 



Fig. 58. Scheme to illustrate the relation 

 between external conditions and anom- 

 aly. Shifting of the apex of the curve. 

 A, the effect of high nutrition ; B, the 

 effect of unfavorable conditions. The 

 (a) and (b) curves illustrate the dis- 

 position of the leaves of the stems of 

 Lysimachia vulgaris ; a, after high, b, 

 after low nutrition. (See the figures on 

 page 314.) 



Fig. 59. Lysimachia vulga- 

 ris. Rhizome buds which 

 would develop into stems. 

 A, thick, with quaternary 

 bud ; B, thin, with ternary 

 whorls in the interior of 

 the bud. The visible 

 scales show a decussate 

 arrangement in both 

 cases. (For diagram see 

 Fig. 57.) 



in a decussate arrangement at the lower end (Fig. 59), 

 but within the bud the disposition of the leaves is different. 

 In this region the structure is that which will be mani- 

 fested by the growing stem in the summer. 



The thickness of the future stem is correlated with 

 that of the upright subterranean shoot, and on it depends 

 the disposition of the leaves. The weakest shoots have 

 the leaves arranged in opposite pairs, the stronger ones 

 in trimerous and the strongest of all in tetramerous 



