Nos. 455-456.] CO.VMOX KOADSWE PLANTS. 



825 



roughly oblong shape. The fifth leaf has the auricled base 

 characteristic of the species. Later leaves hold to this char- 

 acter. The early leaves of the seedling are red while later ones 

 are green. 



Turning to the early spring growth, very similar stages are 

 noted '(Fig. 18). In this 

 weak plant the stages are 

 exactly the same, leaf for 

 leaf, as in the seedling after 

 the cotyledons. In Figure 

 19, the early growth of a 



somewhat stronger plant, the Fi<,s. .7-19. -SeedUng and eady spring growt^hs of 

 first two leaves are similar to ^"Z'^T^^^A first five'nepionl'c 'leaves ; 18-19, 



the first two of the seedling. 

 The auricled form appears 



here in a vigorous plant in the fourth leaf, one stage earlier than 

 in the seedling. The leaves in the early spring growth also 

 resemble the seedling in their "reddish color, but this is a super- 

 ficial resemblance and not one of true repetition. It is depend- 

 ent upon other causes. 



On the flowering stalk there is a reduction of the base m the 

 same manner, but in the reverse order, until below the flower 

 there are linear leaves with narrow apices and bases. Thus the 

 first leaves of the direct development in the seedhng, the first 

 leaves in the localized development in early spring growth and 

 the last leaves in the reversionary localized senescence below 

 the flower a^e without the auricled bases. In all other parts of 

 the plant the leaves have the auricled base typical ot the 

 species. 



Potcntilla canadensis L. Figures 20-23. 

 (Common Cinquefoil.) 

 In this plant the seedling usually has the first nei3ionic leaf 

 simple, the second ternate (Fig. 20). Succeeding leaves are 

 ternate but apparently five palmate, due to the splittmg of the 

 lateral leaflets into two parts as shown in leaf 4 of F^g^^^ 

 spring growth. 



