THE DEHISCENCE OF ANTHERS BY APICAL PORES 



241 



A 



those 



of the one representing the distribution of all of the flower- 

 ing plants is facilitated by subtracting the per cent of all 

 genera in a region from the per cent of apically dehiscent 

 forms and so indicating the relative abundance of the latter 

 in plus and minus quantities, as in Table C. 





TABLE C. 







GENERA OF SOLANUM-CASSIA TYPE. RELATIVE ABUNDANCE. 



Region. 



Endemic. 





Total. 



1 



— 2.96 





— 2.47 



2 



— 1.34 





+ 3.74 



3 



— 1.32 





— 1.80 



4 



■4- 5.77 





+ 7.44 



5 



— 1.23 





— 1.62 



6 



+ 15.14 





+ 16.97 



7 



+ 4.73 





+ 5.58 



8 



— .27 





-f- .93 



9 



— .04 





— .29 



10 



— 5.32 





— 11.53 



11 



— .79 





— 3.84 



12 



— .31 





— 3.43 



13 



— 3.92 





— 7.35 



14 



— .85 





— 6.82 



t 



This rev 



eals some suggestive po 



ints. 



In all regions ex- 



cept 4, 6 and 7, the per cent of apically dehiscent genera 

 endemic is below that of all forms endemic in the same 



In all regions except 2, 4, 6, 7 and 8, the per 



region* 



O 



cent of all apically dehiscent genera found is lower than 



that of other forms occurring in the same regions. 



In 



regions 4. 6 and 7, the average relative abundance of 



forms 



more 



average for the whole number of endemic forms while in 

 the other eleven regions it is 1.66 less* For the apically 

 dehiscent genera occurring in regions 4, 6 and 7 the average 

 is 9.99 above while for the other eleven regions it is 3.22 

 below that of all genera occurring. 



differentiation of Solatium . Cassia 



16 



