106 



MISSOURI BOTANICAL GARDEN. 



more diversified from quadrat to quadrat in size and quan- 

 tity than that upon the southeast slope. These remarks 

 apply merely to the localities from which the samples of 

 material were taken. 



It occurred to me that a consequence of this condition 

 might be a greater variability of the length of the stem in 

 the series from the southwest slope. Here some of the plants 

 grew up through large tufts of grass or dead weeds, while 

 others occurred in open spots. Some were close to shrubs of 

 considerable size and others grew where the vegetation was 

 much smaller. On the southeast slope, on the other hand, 

 the grass was rather uniformly short and weeds and bushes 

 very few. If variability in the individuals of a population 

 be to a considerable extent due to diversity in their edaphic 

 environment, as many writers have suggested, it would seem 

 quite reasonable to expect a greater variability on the south- 

 west slope where conditions were apparently more diverse 

 than on the southeast slope. 



TABLE I. NOTHOSCORDUM. 





















Length of Stalk 



m 



Centimeters 

























9 



10 



1112 



13 



14 15 



16 



17 



18 



19 20 21 



22 23 24 



2526 



27 



28 



29 30 



3132 33 34 Totals 





3 







1 











1 









1 































3 



I 



4 





1 



1 



3 



4 



2 



11 



6! 3 



1 



3 



2 



1 



2 





1 







1 

















42 



5 



2 





3 



2 



2 



10 



ll'll! 6 



15 



8 



4 



2 



3 



6 



1 







3 

















89 



6 



6 





1 





1 



1 



8 



2 



7 



8 



10 



8 10 



9 



7 



3 



3 



2 



1 





1 















82 



7 







i 



1 



1 



2 



3 



2 



2 



7 



611 



9 



8 



13 



4 



3 





2 



1 



i 



1 











79 



K 



8 









. .|. . 











2 



5 2 



2 





6 



3 





2 



1 



2 









4 







29 





9 











1 



i 



i 



i 





1 





4 



4 



2 



1 



2 



1 



1 



2 



2 













24 



10 

























1 







1 







2 









2 











6 



o 



11 

















•• 













i 







1 





8 



1 

 7 



1 

 4 



3 



— 







1 



5 



Totals 



2 



2 



6 



7 



9 



23 



28 



28 19 



36j30|31 



27 



25 



31 



13 



8 



6 



4 



1 



1 



359 



CORRELATION IN FIRST COLLECTION, SOUTHWEST SLOPE. 



For the purpose of ascertaining whether the plants from 

 these two spots, distant only a few yards from each other, 

 do show differences in variability and correlation the material 

 was collected in separate lots. That from the southwest 

 slope comprised 359 flowering-stalks and the correlation be- 



