Pollinatioih of Pecans 101 



towards the apex. The pollen formed at the distal end or 

 apex of the catkins is almost devoid of germ-pores and not 

 infrequently shows signs of degeneration in the nnelei. 



In the development of the pollen in the first gronp, the 

 average difference in time between the tetrad stage and pollen 

 formation was approximately two days, while for the second 

 gronp the average was approximately two and one-half days. 

 In the first the average time between the pollen formation 

 and the first shedding of pollen was approximately fifteen 

 days, while for the second gronp the average was approxi- 

 mately eighteen days; but these intervals vaiy less than do 

 the intervals between the appearance of the catkins and the 

 tetrad stages of the two groups. 



The following tables give the differences and some of the 

 characteristics of the two groups : 



TABLE VIII 



DiFFEEEXCES BETWEEN TwO GROUPS OF PeCANS 



Group I 



>> >> -^ s 



*J ■*-> r 



0> ^ ^ X* 



eS eS c3 - 



> > a 



Alley 1 4/4 



Mantura 1 4/4 



Centennial 1 4/4 



Mobile 1 4/6 



Xelson 1 4/3 



Pabst 1 4/7 



Randal 1 4/5 



Rome 1 4/5 



San Saba 1 4/6 



T. 



i- - 



n r 



X 



•r 



= = 



^1 

 r a: 

















^ 







J^ 











"7 ^ 



'^ T. 



Y- 



'^9. 





- ^. 





'E. ^ 



^ o 





•- t; 



Z'z. 





o S 

 ■^=3 





-w^ 





i^3 



%l 





P 



Q 



c 



Q 



Q 





U 



4/4 



4/27 



5/8 



5/1 



5/17 



80 



85 



4/5 



4/27 



5/3 



0/1 



5/12 



30 



95 



4/4 



4/27 



5/3 



5/2 



5/12 



72 



85 



4/6 



4/26 



5/6 



0/3 



5/13 



75 



95 



4/3 



4/25 



5/2 



4/29 



5/10 



76 



100 



4/8 



4/2S 



5/6 



5/2 



5/21 



32 



110 



4/5 



4/28 



5/5 



5/1 



5/13 



70 



95 



4/5 



4/25 



5/4 



5/1 



5/10 



24 



120 



4/6 



4/26 



5/4 



5/2 



5/17 



36 



85 



