Volume I NOVEMBER. 1910 No. 1 



WHITE FLOWERED VARIETIES OF PRIMULA 



SINENSIS. 



By FREDERICK KEEBLE, 

 Professor of Botany, University College, Reading ; 



AND Miss C. PELLEW, 

 Research Student, Botanical Lahoraiory, University College, Reading. 



[It was intended that this paper should be published simultaneously 

 with an extensive memoir by Mr R. P. Gregory on inheritance in 

 Primula sinensis. Mr Gregory's paper is already in type ; but 

 owing to its length and to delay incidental to preparation of the 

 coloured Plates illustrating it, we have been obliged to hold it over 

 for the next number of the Journal. — Edd.] 



White Flowered Varieties. White flowered varieties of Primula 

 sinensis are of two kinds, one with red or reddish stems (coloured 

 stems) and the other with green stems. Coloured stemmed whites, 

 when crossed with a variety with coloured flowers, yield an Fi with 

 white or tinged white flowers. Green stemmed whites, when similarly 

 crossed, yield an F^ with coloured flowers. Since the white or tinged 

 white ^1 plants give rise, on selfing, to white and coloured flowered 

 plants in the proportion of three white to one coloured, it is inferred 

 that the coloured stemmed whites carry the factors for colour, but that 

 pigment formation is inhibited by the presence of a dominant white 

 factor. Since, also, green stemmed whites give rise, when crossed with 

 a colour variety, to a coloured -Pi, it is inferred that they lack the 

 dominant white factor as well as one or more of the colour-factors. 



Jonm. of Qen. i 1 



