430 MR. A. W. SUTTON ON RESULTS OBTAINED BY CROSSING 



Chief clia racters of the Palestine Pea. 



Weak or slender habit of growth. (PL 15. fig. 1 B.) 

 Self-coloured magenta blooms. (PI. 15. fig. 2 D.) 

 Serration of the stipules and leaflets. (Fig. 1, also PI. 15. fig. 3 F.) 

 Seeds, olive-green, mottled with brown, and no black hilum. 



(PI. 17. % 9.) 



Pods produced singly or in pairs. (PI. 15. fig. 3 F.) 

 Absence of colour in the axils. 

 Woolliness in the interior of pod. 

 No fasciation in steins of plants. 



I made 24 mating* between this Palestine Pea and a corresponding number 

 of forms of the white flowering " Pisum salivum," and 1(5 matings between 

 the Palestine Pea and various forms of the coloured flowering " Pixmn 

 ari-i>nse." In some cases the Palestine Pea was used as the pollen parent, 

 and in others as the seed-bearing parent. 



30 out of the 40 matings either failed to germinate, or flowered but 

 were sterile, or produced seeds in F 2 , which then failed to germinate . 

 4 only did I find it possible to continue to F 3 or further, and of these 4 

 I propose to describe one only, as follows : 



(The reason I liave chosen this cross is because it is the only instance in which one of the 

 parental types was umbellate with fasciated stem, the parents thus affording greater contrast 

 tlian could otherwise have been the case.) 



PARENTAL FORMS 



1'i.inm sativum umbellatum. (PI. 15. fig. 1 A.) 

 (Crown-flowered or so-called Mummy Pea.) 

 The Palestine Pea. (PI. 15. fig. 1 B.) 



Chief characters of Pisum sativum umbellatum : 



Strong habit of growth, about 6 feet in height. (PI. 15. fig. 1 A.) 

 White flowers produced in umbels terminally instead of axillary. 



(PI. 15. fig. 2 C.) 



Pods produced in clusters. (PI. 15. fig. 3 E.) 

 White round seeds, no black hilum. (PI. 17. fig. 10.) 

 Absence of serration in the leaflets. 

 Absence of colour in the axils. 

 Stems of plants very much fasciated. 



Between these two forms 6 crossings were made, using several plants of 

 each parental form, but only one succeeded, and this gave one seed only. 



