Caroline Pellew and Eva Richardson Sansome 29 



Duke of Albany x Thibetan pea. 



A few of the most important differences between the parents are 

 shown in the following list ; the only one to be considered here in detail 

 is that of round and wrinkled cotyledons. A linkage between this pair 

 and the pair for stumpy and pointed pods, found by Kappert (1925), 

 is also found in these hybrids. The other factors in the list have been 

 shown by various workers to be independent of one another, but, in 

 these hybrids, their independence has not yet been determined. 



Duke of Albany (D.A.) Thibetan variety (Tb.) 



TaU, 5-6 feet Short, 2-3 feet 



Long growing period Short growing period 



Foliage : Intermediate between D.A. type and rogue. 

 Type : broad, truncate, marbled Small 



Rogue : narrow pointed, shgbtly marbled 



Flowers white, no anthooyanin pigment Flowers coloured, testa coloured etc. (A) 

 formed (a). (Bears factor for spotted Th. 7. Testa self-coloured, Se 



testa, se) Th. 10. Testa spotted, se 



Cotyledons green (y) Cotyledons yellow (Y) 



Cotyledons wrinkled (r) Cotyledons round (R) 



Pods pointed (bt) Pods stumpy (Bt) 



The crosses we are concerned with were made in 1926, as follows: 



D.A. rogue x 615i (Th. 7). F^ no. 230/27. Five plants. 



D.A. type x 615i (Th. 7). Fj^ no. 233/27. Two plants. 



X 6172 (Th. 10). #1 no. 231 and 232/27. Six plants. 



x 6811 (Th. 10). #i no. 234/27. Four plants. 



The Fi plants were large (4-5 feet), purple flowered, with "rogue" 

 foliage in 230, "type" foliage in the rest. They all flowered at the same 

 time as the parents, both of which have the first flower at about the 

 12th node of the main stem. The seed ripened earlier than I expected, 

 and consequently a great deal was taken by birds, a serious pest in this 

 neighbourhood. I was able, however, to save the whole of one plant in 

 230 (No. 1) and to observe that it was partially sterile, with many gaps 

 in the pods due to the failure of ovules. A few seeds were also saved of 

 a sister plant (230^) and of two plants in 233. No note of their fertility 

 was made, but among their offspring were some partially sterile plants 

 and it is probable that they also were partially sterile. Both in 230 and 233 

 the testa was self-coloured. Of the rest of the crosses three separate 

 plants were harvested complete, and small quantities of seed from four 

 others. No sterility was noticed in these, and their ofispring were uni- 

 formly fertile, gametic failure either of ovules or pollen being exceedingly 

 rare. The testa of all these plants was spotted or blotched with purple 

 pigment. 



