Mr Gregory, Note on the Histology of the Giant, etc. 239 



Note on the Histology of the Giant and Ordinary Forms of 

 Primula sinensis. By K P. Gregory, M.A., St John's College. 



[Head 17 May 1909.] 



(Plate X.) 



During the last few years the Giant form of Primula sinensis 

 has become well established in cultivation, and is now known in 

 many of the numerous horticultural varieties of this genus. 

 Nothing definite is known as to the origin of the form, nor can 

 we at present say anything as to the behaviour of the Giant and 

 Ordinary characters in cross-breeding, although experiments are 

 now in progress in this connexion. 



Flowers of the two plants described. In each case the upper flower is newly 

 opened, the lower is older. Scale divided in inches. From a photograph. 



Plants of the Giant form are of a somewhat coarser general 

 habit than those of the usual form. As compared with the latter, 

 they are characterized by the stoutness of their stems and petioles, 

 and by their larger leaves and flowers. In Giants of the " Stellata " 

 type, the petal-lobes are broad, and, unlike those of the ordinary 

 form, overlap one another to a greater or less degree (see text 

 figure). My experience of the seeds of the Giant form is limited 

 to those obtained this year from a few plants ; they were, on the 

 average, larger than those of the ordinary type. I am indebted 



