R N. Salaman and J. W. Lesley 37 



DESCRIPTION OF PLATES ll-V. 



PLATE II. 



Fig. 1. Pure "prostrate" families — M5 B35, 1. 



A row of ' ' upright " plants is seen in the background and part of a row on the 



extreme right. 

 Fig. 2. The original " prostrate " family 31 5 7? 35 as grown in Cambridge. 

 Fig. 3. " Upright " and " prostrate " plants in an F-2 family from "prostrate " x " upright." 

 Fig. 4. Left, a typical "prostrate"; right, a "procumbent" plant in the same family 



from a "prostrate" (Af 5 B35, 1) selfed. 

 Fig. 5. " Prostrate " plant. 



Fig. 6. " Procumbent" plant from "procumbent " selfed. 

 Fig. 7. " Procumbent " plants segregating out in a heterozygous family. (Kew A xK'^12Q.) 



To the left an "upright" followed by three " procumbents," on the extreme right 



a bushy " upright " plant. 



PLATE III. 



Fig. 1. Pure " prostrate " family, M5 BS5, 1. 



The seedlings have already collapsed and begun to adopt the characteristic habit. 

 Fig. 2. Fi. Fb 165 xERG5xM5 B 35, 1. ("Upright " x " prostrate.') 



The plants are as "upright" as those in fig. 3, illustrating dominance of ' ' upright " 

 oyer " prostrate." 

 Fig. 3. Fi between two " uprights." (Early Puritan x Fb 165 x ER 65.) 



PLATE IV. 



Fig. 1. Transverse section of adult aerial stem of an " upright " (Flourball derivative). 



Safranin : showing interfascicular xylem. x 15. 

 Fig. 2. Transverse section of adult aerial stem of " prostrate " localized and weak 



development of interfascicular xylem. x 15. 



PLATE V. 



Fig. 1. "Betted " stem of " prostrate " (M 5 B 35, 28) on the left and of " upright " (a 



Flourball derivative) on the right. 

 Fig. 2. Part of radial longitudinal section of interfascicular region of aerial stem of 



(1) an "upright" (variety of "Up-to-date") showing strip of cambium and early 



secondary vascular tissue. 



(2) a " prostrate " (seedling from M5 B 35, 28). 

 No cambium or secondary vascular tissue, x 20. 



