828 THE AMERICAN NATURALIST. [Vol. XXXVIII. 



Beneath the flower there may be a very sHght reduction in 

 the number of leaflets, but as a rule it is not carried to any 



Chciiopodiiiin album L. Figures 26-36. 

 (Lamb's-Quarters. Pigweed.) 

 This very common weed shows excellent localized stages. It 

 is an annual and therefore shows it smiply m 

 the localized senescence below the flower. 

 The seedling (Fig. 26), shows the direct 

 development. The first two nepionic leaves 

 are narrowly oval, tapering at the base and 

 apex, with the basal portion not broader 

 than the similar apical portion. The third 

 leaf has a broader base and in the fourth it 

 has become decidedly angled. In succeeding 

 leaves the base becomes angulate-toothed (leaf 

 F.G. 26. -Seedling of ^^^^ ^^'^^^ quickly to the adult character 



ch.nopodiu,,, ,,1/unn. {V\g. 2/), aud Is contluued until flowering. 

 c, ^n<l^ever^^o^llu' Then comcs the reduction shown in the series 

 nepinnicieaves. (Figs. 27-36). Thls scoes reprcscttts leavcs 



in the axils of which branches or flowers are produced. The 



