488 University of California Publications in Botany [Vol.5 



Latifolia X angustifolia. Fg latipolia of type 6 was crossed with 

 angustifolia giving H-2 = type Q^xangustifolia(^ and H53, its recip- 

 rocal. The derivative parent possessed the short winged petiole char- 

 acteristic of LATiFOLL\ of type 6. In F^ 50 plants of each cross were 

 grown. They exhibited the long naked petiole characteristic of angus- 

 tifolia. 



In Fo two populations of 50 plants each were grown. In color of 

 flowers the two populations were light pink throughout, closely cor- 

 responding in this respect to angustifolia. In leaf shape the segre- 

 gation was sharply into two classes: the stenophylla type of leaf 

 base (long, naked petiole) and the latifolia type (shorter, winged 

 petiole). There was some variation in the stenophylla class sug- 

 gesting intermediacy between angustifolia and latifolia, but the forms 

 exhibiting it showed a graded series from strict stenophylla to inter- 

 mediate. The LATIFOLIA class was very uniform and sharply set off 

 from the other class. The segregation ratios observed were as follows : 



Totals 78 22 



AuRicuLATA X niacroph ylUi. F. auriculata of type 6a was crossed 

 with macrophylla giving H,,^ and H-^ ^ F- type 6a'^ x macrophyllac^ 

 and H-- and H-„, their reciprocals. It should be observed that type 

 6a is an early segregant from the latifolia of type 6 of H-, and H.,,. 

 In Fi 50 plants were grown of each of the four parents. All four 

 populations were equivalent in every respect. All the plants had pink 

 flowers, although one plant had flowers of a lighter shade than the 

 others, and leaves of a shape somewhat intermediate between the two 

 parents, i.e., they were more contracted at the base than macrophylla, 

 but much less so than those of type 6a. One plant of H-,^, namely 

 15FiH,5Pi,3, showed larger corollas than any of the other F^ plants 

 of any famil}^ and was selected for further breeding. 



In Fo four families were raised and they proved to be equivalent 

 in all respects, except as noted. There was sharp segregation for leaf 

 shape into the sessilifolia and the sharply constricted auriculata type. 

 In the sessilifolia class there were a number of obvious intermedi- 

 ates, as might be expected from the characters exhibited by F^, but 

 they formed a continuous series with the strict sessilifolia forms. 

 The auriculata class did not intergrade with the dominant class. 



