474 



University of Calif &rma Puhlications in Botany [Vol. 5 



In F, primary selection for parents of subsequent generations was 

 based upon the type of leaf borne by the plant, flower color being 

 followed as a secondary matter. In order to systematize the discussion 

 concerning Fg and subsequent generations, six general types have been 

 selected and named and the discussion of the families has been grouped 



Fig. 1. — Chart showing the relationships of the various families of the angusti- 

 foUa-macrophylla series. The different Fi hybrids are connected with their female 

 parents; no seed was secured from Hj. The Fj family designations correspond to 

 those given in table 1, and the numbers in later generations are the type numbers 

 under which the populations are described in the text. F« and F5 of type 12a were 

 grown in 1914 and 1915 respectively. 



under these headings. The six general types selected and the names 

 given them are as follows: 



a. Stenophylla derivatives. As a series these approximate very 

 closely in leaf shape to angustifolia. The distinguishing feature of 

 this series is the possession of a distinct, long petiole. 



h. Latifolia derivatives, which are characterized by the possession 

 of a broad leaf with a petiole shorter than that of angustifolia. The 

 petiole in these types is more or less winged. 



c. Lanceolata derivatives, which are characterized by the posses- 

 sion of a lanceolate leaf like that of type 13, illustrated in plate 75. 

 This is a non-petiolate form. 



d. LoRirpoLiA derivatives, characterized by possession of long leaves 

 with very narrow blades. The type specimen, type 12, is illustrated 

 in plate 74. This also is a non-petiolate form resembling the lanceo- 

 lata derivatives, from which it differs in the extreme narrowing of the 

 blade. 



