R. P. Gregory 



89 



tendency to the development of high spires of flowers, and the corollas protruded from 

 the calyx in the young bud. 



A detailed study of the various characters of these offspring suggests that we are not 

 yet justified in regarding the differences between the sinensis and steHata types as 

 depending upon one factor. If it should prove that the characters of the axis, of the 

 calyx and of the corolla may be inherited independently, the character designated here 

 as stellata must be taken to refer to the form of the corolla. 



^ The stellata form used in the great majority of my experiments 

 was a strain known as "Primrose Queen" (Plate XXX, fig. 12, and 

 Plate XXXII, figs. 62 and 63, No. 37/9). The F^, resulting from the 

 cross of this with a plant of the typical sinensis habit, consists of 

 sinensis, pyramidalis and stellata forms. The original " Ivy-leaf" plant 

 also proved to be a stellata form. When this plant is used, Ivy-leaves 

 of course appear in the F„, in addition to the forms already mentioned. 

 The F^ Ivy-leaves are presumably of different forms, corresponding with 

 the forms met with in the normally developed plants, but, owing to 

 the poor development of the flowers and inflorescence, it is impossible 

 to say more than that, in some, the petals were more or less crenate. 



It is not easy to draw a sharp line of distinction between the 

 pyramidalis forms and the true sinensis type ; in the following table 

 they are therefore grouped together. 



The numbers obtained are 



Double Flowers. 



Two types of doubling of the flowers in Primula sinensis are known 

 to me, in both cases in long-styled plants, though experiments are in 

 progress which, it is hoped, will give short-styled doubles \ 



' Short-styled doubles of the type shown in Text-fig. A, have now (Feb. 1911) been 

 obtained, in the F., from short-style, single x long-style, double. So far as the morphology 

 of the corolla is concerned, the short and long-styled doubles very closely resemble one 

 another ; they differ of course in the size of the pollen grains and in the length of the 

 style. 



Jomrn. of Gen. i 7 



