Oct., 1923] 



STOUT — STUDIES OF LYTHRUM SALICARIA 



443 



Table I . Self -compatibility in Lythriim Salicaria to insect- pollination, and cases typical for 

 the results obtained for controlled hand- pollinations 





Isolation, Insect- 

 pollination 



S. no. 1 



S. no. 2. (1918). 

 S. no. 2. (1919). 



L. no. 1 



L. no. 2 



M. no. 2 



to 1 *) [lower i! 



2 



o 



17 

 161 



65 



53 



3 ro 



Si 



3 



Distribution of Seed per Pod. Class Groups i^to 10 



17 10 

 IOO O 



65 16 



53 3 



3000 300 14 



many 71 7 



few 31 3 



few 40 6 



7 



34 30 



47 2 



47 3 



202 48 



43 12 

 16 3 



20 3 



" total 



Hand-pollination 



M. no. 1. (1919)- • 233 



M. 5-1 no. 13 103 



M. j no. 7 4>S 



M. 1 no. 48 35 



M. 1 no. 31 33 



M. / no. 56 1 60 



M. 5-1 no. 25 32 



M. 5-1 no. 35 32 



M. / no. 30 37 



M.J no. 57 

 L. 4 no. 2 . 

 L. / no. 66. 

 L. 2 no. 18. 

 L. 1 no. 8. . 

 L. 5-5 no. 38 



? 1500 142 16 



40 



55 

 68 

 50 

 49 



24 

 S. 5 no. 5 14 



134 '34 

 o 



8 8 

 6 

 4 

 9 

 9 

 5 

 9 

 44 



7 



6 



4 



79 

 28; 



5 

 1 



o 

 o 

 o 

 o 

 c 

 1 



2 



[6 



1 

 10 1 



1 2 



2 ! I 



4 5 



7 6 



2 1 



3 2 



4 o 



1 5 



2 



1 2 



01 



1 1 2 3 1 



000 



O I 2 



I I 



8 3 



1 



o 1 



o 1 



12 5 



1 22 



|0 I 





3-28 



23.67 



2.96 



4-85 

 8.91 



18.25 



24.61 



7.00 

 20.33 

 25.00 



28.33 

 50.88 



49-5o 

 59.66 



63- 1 5 

 6.00 

 6.00 

 7-42 

 8.90 

 20.00 

 14.00 



capsules that could be referred definitely to differences in insect visitations 

 or to the constitution of the plants. 



Mid-styled Plants Grown in Isolation. A plant of this form (M no. 2) 

 was sent to Mr. H. L. Skavlem, who grew it at Carcajou Point, Lake 

 Koshkonong, Wisconsin. Mr. Skavlem states that by the middle of July 

 this plant was "over four feet high with an abundance of bloom which con- 

 tinued for about six weeks." The plant bloomed from July 14, 1918, until 

 the first week in September. There were about 35 well -developed main 

 flower spikes ranging from 3 to 14 inches in length, and the total number 

 of flowers produced was estimated at 8,000. This description would apply 

 as well to any well-developed plant of any of the three forms. 



This mid-styled plant was decidedly self-compatible in this isolation 

 test. At least 3,000 capsules matured on it in 191 7. A total of 300 cap- 

 sules were examined and counts were made of the seeds present, with 



