434 CROSSING PALESTINE WILD PEA WITH COMMERCIAL TYPES. 



the seed-coat appear almost empty. In the reverse crosses when the Pales- 

 tine Pea was used as the seed-bearing parent, the resulting seeds of the 

 hybrid in F : were very similar to those of the Palestine Pea, but sometimes 

 of a larger size. 



The main purpose of the experiments was to ascertain, if possible, the 

 relationship of the wild Palestine Pea to the cultivated forms, and although, 

 as the result shows, it cannot be claimed that the Palestine Pea is certainly 

 the forerunner either of the present day Garden Peas or Field Peas, yet the 

 fact that some of the hybrids are now fertile does not preclude such a 

 possibility. 



EXPLANATION OF THE PLATES. 



PLATE 15. 

 Fig. 1. Parental types of the cross. 



(A) Pisum sativum umbellatum. 



(B) The Palestine Pea. 



Fig. 2. Inflorescence of the two parental forms. 



(C) Pisum sativum nmbellatum. 



(D) The Palestine Pea. 

 Fig. 3. Pods of the two parental forms. 



(E) Pisum sativum umbellatum. 



(F) The Palestine Pea. 



Fig. 4. (G) Inflorescence of New type No. 1 and' inflorescences of existing umbellatum 



types for comparison. 



(H) Pisum sativum umbellatum, white-flowered. 

 (I) Pisum arvense umbellatum, rose- and white-flowered. 



PLATE 16. 

 Fig. 5. Plant of new type No. 2. 



6. Plant of new type No. 3. 



7. Plant of new type No. 5. 



8. Plant of new type No. 6. 



PLATE 17. 

 Fig. 9. Seeds of the parental Palestine Pea. 



10. Seeds of the parental Pisum sativum umbellatum. 



11. Seeds of various forms of " Pisum sativum " for comparison. 



12. Seeds of various forms of " Pisum arvense " for comparison. 



13. Seeds of new type No. 1 (dark-blossomed bi-coloured umbellate form. (Plant 



shown on PI. 15. fig. 4 G.) 



14. Seeds of existing white-flowered umbellate form (the parental Pisum sativum 



umbellatum, same as fig. 10). 



15. Seeds of existing rose-and-white umbellate form. 



10. Seeds of new type No. "L (Plant shown on PI. 16. fig. 6.) 



17. Seeds of new type No. 3. (Plant shown on PI. 16. fig. 6.) 



18. Seeds of new type No. 4. (Plant not illustrated.) 



19. Seeds of new type No. 5. (Plant shown on PI. 16. fig. 7.) 



20. Seeds of new type No. 0. (Plant shown on PI. 16. fig. 8.) 



