Double Fhru'crs and PlozvcrJicads. 



199 



and other bulbous plants.^ There is a certain periocHcity 

 in this case too ; for sometimes the hrst, but more usually 

 the later, flowers are less double than those which bloom 

 in the height of the flowering period. This fact is well 

 known to breeders,- especially in the case of certain 

 double varieties of Begonia in which seeds can only be 

 saved from the autumn flowers. 



Fig. 36. PyrctJiniin roscum, from the nursery of Messrs. 

 Krelage & Son in Haarlem (1899). I" one half (the 

 rear half in A, the left in B) the inflorescence is made 

 "double" by the elongation of the tube-florets ; in the 

 other half it is "single." A, oblique view ; B, section. 



The majority of double varieties are constant from 

 seed, even in the case of trees and shrubs (varieties of 

 the peach and the apple for instance),'^ others appear to 

 be only slightly so, and others not at all (Pruniis spi- 



^LiNDLEY, Theory of Horticulture, p. S33- 



^ Carriere. Production ct fixation dcs varlctcs, 1865, pp. 66 and 

 67 {Camellia alba plena, incarnata, Fuchsia, etc.). 



^ Verlot, loc. cit., p. 83. 



