WHITE— STUDIES OF INHERITANCE IN PISUM. 549 



colored seed coats, there are forms of Pisitni with colored flowers 

 and unpigmented axils. In the absence of pigment, the leaf axils 

 and other structures noted above are greenish white or yellowish 

 green, with which are associated white flowers and colorless seed 

 coats. 



Varieties Studied. 



Colored Axils, Colored Flozvers. 



Purple Sugar Pea, Purple-podded Pea, Irish Mummy {P. sat. um- 



bellatum or Egyptian Mummy, Crown pea, etc.). Purple-flowered 



Field Pea — Lock (54, 56). 

 English Gray Field Pea — Darbishire. 

 Graue Riesen (Purple Sugar), Svalof P. arv., Nos. VI., VII., VIII., 



IX., X.; Red-flowered Kneifelerbse and others — Tschermak (81, 



86). 



Non-colored Axils, Colored Floivers. 



Svalof P. arv., No. IV. — Tschermak (86), Tedin. 

 P. humile ?, P. quadratum ? — Sutton (74). 



Non-colored Axils, White Flozvers. 



A large number of white-flowered varieties have been used in 

 studying inheritance of axil color. Among them are, 

 Laxton's Alpha, Veitch's Perfection, Sunrise, British Queen, Vic- 

 toria Marrow, Tres nain de Bretagne and others — Lock (54, 56). 

 Victoria Marrow, Emerald, Yellow-podded Sugar Pea, and others — 

 Tschermak (86). 



Results from Crossing. 



Colored axils, colored floivers X non-colored axils, colored 

 flowers in F^ gave all colored axils, colored flowers. In F,, Tscher- 

 mak (86) obtained in such crosses. 



Actual, 132 colored flowers and leaf axils : 49 colored flowers, non- 

 colored leaf axils. 



Ratio, 2.7 : i 



Expected, 135.75:45.25 

 Ratio, 3:1 



Colored axils, colored floivers X the same always breeds true in 

 F^ and succeeding generations. 



