09 



(.. H. OSTEMEI.I) 



was splf-fertilizod and gave in 1921 as Fo 44 normal and 15 



l)ij)innat('. Again one of these (No. 514 c) was self-fertilized 



and gave in 1922 only hipinnate plants {F3). 

 r. A white herniai)hr(>(lite with l)ipinnate leaves (No. 520) was 



present in a plot of plants from seeds from Haage & Schmidt 



(19J9— 20). In 1921 it was self-fertilized and gave in 1922 only 



hipiiHiate ])lants (46 individuals). 

 (1. A hlue female with hipinnate leaves (No. 498 b) was, in 1919, 



crossed with a blue hermaphrodite with bipinnate leaves (No. 



500 b). The offspring (53 individuals) were all bipinnate. 

 e. A white female with bipinnate leaves (No. 507 c) was in 1921 



crossed with a normal blue hermaphrodite (No. 514 a, offspring 



of No. 500 a). The plants raised in 1922 (179 individuals) do 



not show any sign of being bipinnate. 

 Thus it appears from these experiments that the bipiniidtc 

 fdclor is recessive. 



2. Micropetaly (P. coenileiim. var. micropetalum). 



a. In my original cultures I had one blue-flowered hermaphrodite 

 with micropetaly. This plant was self-fertilized in 1917 and 

 gave an offspring of only 4 individuals (No. 501), all micrope- 

 talous, but two more than the others. Two were white-flo- 

 wered (Nos. 501 b and 501 d), one blue-flowered (No. 501 a), 

 and the fourth was an abnormal form with no stamens and 

 teratological pistils; it was sterile. The three others were self- 

 fertilized in 1919 and all the offspring showed micropetaly 

 (altogether 61 individuals). 



b. Also self-fertilization of a micropetalous plant with bipinnate 

 leaves (No. 502 a) gave an offspring of only micropetalous 

 individuals (121 individiduals). 



c. One of the offspring (No. 517) of the plant mentioned above 

 (No. 501 b), a white-flowered micropetalous plant, was in 1921 

 crossed with an ordinary white-flowered hermaphrodite. The 

 seedlings have not yet flowered, and before next year it is not 

 certain, if micropetaly — what seems perhaps probable — is a 

 simple recessive factor. 



3. White colour recessive to blue colour. 



This fact was shown, as mentioned above, by de Vries and 

 Dahlgren, and one of my experiments confirms it: A white female 

 (No. 497 a) was, in 1919, crossed with a blue hermaphrodite (No. 

 500 a). The offspring of 22 individuals were all blue. 



