Studies on the Genetics of Flower-Colours in 
Portulaca grandiflora. 
By 
S. Ikeno. 
With Plate II. 
CONTENTS. 
Page. 
Introduction . . . 93 
Materials and Methods . 94 
Flower-Colours. 96 
Factors . 97 
Crossing Experiments. 
Cross I. White-I x orange and vice versa . 98 
„ II. Yelloio x ichite-I . 99 
,. III. Bed x orange and vice versa . 101 
„ IV. White-I x ichite-II and vice versa, etc. 103 
„ V. While-I x magenta and vice versa . 103 
„ VI. White-II x magenta . 106 
„ VII. White-IIx orange and vice versa . 108 
„ Vni. Magenta x orange . 112 
Multiple Allelomorphism . 117 
Note on the so-called “ pseudo-white ” Race. 119 
Colours of Vegetative Organs and Floral Parts . 120 
Mutations, etc. 121 
Summary . 131 
Explanation of Plate II. 133 
ERRATA. 
Page 
125 
Line 
22 
insert of successive 
after simultaneous 
126 
J4 
insert or successive 
after simultaneous 
129 
7 
read white-II x orange instead of white-II x magenta. 
