A. B. Stout 99 



Series 3. There were 43 plants in this series all of which were 

 grown in pots. "Periods of bloom varied from 28 to 69 days. The 

 number of flowers self-pollinated per plant ranged frotn 6 to 25 and the 

 total was 474. Thirty-six plants were completely self-sterile and did 

 not produce pods. For 5 plants, empty pods of small size developed, 

 for flowers selfed. One plant gave a single pod with 6 seeds out of 

 18 flowers self-pollinated, a result that may be attributed to experi- 

 mental error. Large fine pods with numerous seeds were frequently and 

 very generally produced from flowers that bloomed in the open and were 

 subject to cross-pollination by insects. 



Series 4. The 46 sister plants of this series grown in pots bloome'd 

 for periods of 11 to 70 days. From 6 to 18 flowers per plant were selfed 

 under bags, and the total for all such flowers was 513. 



Thirty-two plants were completely self-sterile to the extent that 

 pods were not formed. For 11 plants the pistils of flowers selfed enlarged 

 somewhat and occasionally one was so much as 4 cm. in length, but all 

 were either entirely empty or contained only shrivelled seeds. 



Three plants produced seeds as well as pods. For 1 plant, only 

 1 pod had seed (the number was four) and this was of a flower that 

 opened 24 days after first flower, and 20 days before last flower of the 

 period of blooming. On another plant, 3 seeds from the first flower to 

 open, and 3 seeds from a flower that opened near mid-season were all 

 that developed for the 10 flowers selfed. A third plant produced 2 seeds 

 for a flower that opened at mid-bloom while 7 selfed on later dates 

 gave no seed. 



One plant was grown in isolation in the field. It bloomed for 

 40 days, and 97 flowers in all were tagged for special observation. In 

 these as in all other flowers no pods developed. 



Series 5. Thirty-nine plants of this series were grown in pots. The 

 periods of bloom ranged from 13 to 62 days. The flowers selfed under 

 bags ranged from 4 to 13 per plant, and the total for all such flowers 

 was 263. Twenty-nine plants were completely self-sterile forming no 

 pods ; 8 produced empty pods of small size ; 2 plants produced seed as 

 follows : for 1 plant 12 flowers were selfed and the first flower to open 

 gave 3 seeds, all others produced empty pods: for another plant of 

 9 flowers that opened, 4 were selfed and these gave 6, 8, 7 and 8 seeds 

 respectively. 



Summary. In these five series the greater number of plants were 

 completely self-sterile throughout the entire period of bloom. Self- 

 compatible plants were in larger proportion in some series than in 



