PALESTINE WILD PEA WITH COMMERCIAL TYPES. 433 



entirely distinct from those of the parental umbellate type (PI. 17. fig. 10), 

 each seed of the New type No. 6 having a well defined black hiluin which 

 is entirely wanting in the parent. This appeared in F 4 and came from 

 New type No. 5. 



It will be seen by reference to the Plates that in F 3 the umbellate character 

 reappeared in New type No. 1, but as mentioned, the blooms of this umbel- 

 late type were dark and bi-coloured, and not pink and white as in the only 

 existing form of " Pisum arvense umbellatum " in cultivation. Fasciation in 



O 



the stem reappeared. 



None of the other plants were like the parental Palestine Pea, all being 

 stronger in growth and without serration in the leaflets. 



N.B. It has been quite impossible to test any Mendelian ratios, owing to 

 the marked sterility of the hybrids in the earlier stages. 



General Notes on the Crosses. 



I should like especially to note that the parental Palestine Pea has not 

 reappeared in its true form with self-coloured flowers, neither has there 

 appeared an exact counterpart of the Palestine Pea bearing white flowers, as 

 might reasonably have been expected. I am inclined to think, however, that 

 both may have been produced, and that if so they died off soon after 

 germinating, being of too delicate habit to grow freely in the open ground. 

 The parental white umbellate form, however, reappeared as before mentioned, 

 but with seeds carrying a black hilum. 



I have not yet found a magenta self-coloured umbellate type, nor an 

 umbellate type with serrated leaflets, in fact these two characters, i. e., 

 magenta flowers and serrated leaflets, seem to have entirely disappeared. 



I found that coloured flowers were dominant over white. Non-serration 

 of the leaflets appeared in the one plant in F 2 , and has continued. 



The pods of the hybrids in Fj were generally very small, sometimes 

 smaller than those of the Palestine Pea itself, badly developed, and in most 

 cases lined with a woolly substance inside, and the seedlings were generally 

 sterile. Those which were fertile were only comparatively so, although in 

 the plants which I have been able to keep growing the sterility has to a 

 certain extent been overcome, and in these cases the woolliuess in the pod 

 has practically disappeared. 



When the Palestine Pea was used as the pollen parent, the resulting seeds 

 of the hybrids in Fj were much smaller in size than those of the seed-bearing 

 parent, and frequently the cotyledons were so badly developed as to make 



LINN. JOURN. BOTANY, VOL. XLII. 2F 



