STUDIES ON THE GKNETICS OK IXOWER-COLOUaS, ETfJ. I'-il 



on account of the small nninlwr of tlie cnses which I luive encountered 

 till now. 



1. One white plant derived ex orange x Avhite-I (Table 1, p. '.(8) liits 

 produced besides white flowers SDUie oi-ange-cf)loui"ed ones. Two of the lattor 

 were selfed, and seeds thus obtained have given rise in the next year to 14 

 phxnts which have lx)me, not orange flowei-s as was expected, but white tuies 

 simply. Some white flowers on the original plant were selfed, but seeds got 

 fiDui th(Ma (lid not germinate. As the second generation did not bear orange 

 flowers, the phenomenon -will not belong propsrly to bud-mutation. 



2. One white ^i-plfiut derived ex wliite-I x orange lias produced one 

 branchlet bearing orange flowei-s. These as well as one wliite floAver were 

 selfed. Only t\vo seeds from the former came to germination, and one of the 

 plants thus produced has so far developed as to bear one flower which was 

 mageida ; three seeds tiken on the white flower had germinated and developed 

 to 2 magentfts and 1 orange. 



3. One white plant among the i^.-offepring ex red X white-I has borne 2 

 white flowers and 1 magenta one. No seeds could l)e obtained from the 

 former, but those got on the latter has produced in the next year 3 plants, 

 viz. 2 magentas and 1 wliite, thus the magenta flower was proven to liave 

 baen heterozygous in its genotypic Constitution. 



4. One white pLant among the i^,-progeny ex white-II x magenta has 

 borne Ijesides white flowers one magenta one in 1920. Whether the latter 

 is homo- or heterozygous will l)e examined in tliis year, liecause I have got 

 seeds on this flower. 



Summary. 



1. All coloured varieties of Poiiulaca (jrandiflora are characterised by 

 possessing the factor C. 



2. C aJone gives rise to orange flower-colom*. C and G produca 

 togethot yellow flower-colour, C and It together i-ed ; whilst the magenta 

 colour is due to the co-oparation of the thi-ee factors, C, JB and S. 



3. As to the genetics of flesli-cdoured and " pseudo-iohite " races my 

 experiments are not so fiir advanced as to be able to fuUy establish their 

 respective genotypic constitution. 



