B. MiYAZAWA 13 



reddish-brown colour of winter leaves are, the deeper the flower-colour 

 is ; besides I have reported that white flower-colour is associated with 

 gi'een leaf, and striated flower with striated leaf. 



The above statements shew that the colours of flower and leaf or 

 stem are due to one and the same factor. There are some cases, however, 

 where the colour of flower and that of other plant-organs seem not to be 

 determined by one factor. Shull^ found in the hybrids between Oenothera 

 ruhricalyx smdrubriJiervis and those between ruhricalyx and Lamarckiana 

 that pigmented buds of ruhricalyx is invariably associated with a low 

 degree of pigmentation in stems and rosettes. Besides these, many other 

 examples were reported in Primula sinensis, Helianthus and Lathyrus, etc. 



In the Japanese Convolvulus white flowers may be associated with 

 green or yellow stem, and coloured flowers with pigmented stem. In my 

 experiments the stem-colours in plants with deep-coloured flowers were 

 found to be deeper than in those of light-coloured individuals, and more- 

 over the stems of plants with dark-red flowers were dark-reddish-brown 

 and those of scarlet flowers were reddish-purple. But I could not discern 

 the differences of stem colours between plants with magenta and those 

 with scarlet flowers. Thus the relation between the colours of stem and 

 flower is similar to what we see in Primula sinensis. 



2. On streaked flowers. 



Though there are many investigations on the inheritance of streaked 

 flowers in Antirrhinum, Mirahilis, etc., I will mention here simply the 

 facts observed in Japanese Convolvulus. In and after the F^ generation I 

 have often observed that just one half of a petal to the throat produced 

 a colour entirely different from that in other parts. Such phenomenon 

 did not occur in all flowers of a plant but only in one or two out of fifty 

 or more. Thus I have seen a light magenta part in a light scarlet flower, 

 a magenta part in a scarlet flower, and a deep magenta part in a deep 

 dark-red flower. These are the instances where the dominant colour was 

 produced in a recessive coloured flower, though I have once seen a deep 

 scarlet part in a deep magenta flower, i.e. recessive colour in dominant 

 coloured flower. 



Emerson^ studied the occurrence of anomalous seeds of maize as 

 regards their pigmentation. In one case, the seed was half colourless 



1 Journal of Genetics, 1914, Vol. iv. pp. 83—102. 



2 Zeitschrift fiir induktive Abstammungs und Vererbungslehre, 1915, Bd. xiv. pp. 

 241—259. 



