174 



STRUCTURAL HYBRIDS 



Oporabia dilutata (30) x O. autumnata (38). Harrison, 1920 a. 



Bistort hirtaria (14, large) X B. zonaria (56, small). Harrison and Doncaster, 



1914. 

 Angiosperms. 

 Raphamis sativus (9) X Brassica oleracea (9), 0-1". Karpechenko, 1927, 



a and h. 

 Nicotiana Bigelovii (24) X N. snaveolens (16), 0-1". 



1927 a. 

 Popultis Simonii {19) (presumed hybrid, male), o-i". 

 Canna (9) (presumed hybrid), 0-3". Belling, 1927. 

 Triticum dicoccoides (14) X ^gilops ova a (14), 0-5". Kihara, 1929 a. 

 Narcissus intermedins, N. Tazetta (10) X N. Jonquilla (7), 17'. Nagao, 1933. 

 Iris pallida (12) X /. tectorum (14), 1-2". Simonet, 1931. 



(The second species has smaller chromosomes which 

 recognisable in the hybrid.) 

 Nicotiana Rusbyi (12) X A-, silvestris (12), 241. Brieger, 1934. 



Goodspeed and Clausen, 

 Meurman, 1925. 



are probably 



Table 22 

 The Fluctuation of Chromosome Pairing in Hybrids 



Crepis spp. (h = 4). Babcock and 



J. Clausen, 1929. 

 C. aspera x C. bursifolia 

 C.taraxacifolia y. C. tectorum 

 C . aspera X C.aculeata 

 Triticum and £gilops spp. {» = 14). 



(i) Kagawa, 1929. 

 £ . cylindrica x T. dicoccum 



(ii) Kihara, 1929 c. 



T. dicoccoides x jEgilops ovata 

 (different florets) 



(sister seedlings) 



-ib) 

 ((c) 



(iii) Kihara, 1931. 



T. Spelta(2i) XjE.triuncialis (14) ( (a) 



(different florets) "1 (6) 



iJtb^Jspp. (« = 8). Meurman, 192S. 

 R. sanguimum X R. odoratum ( (a) 

 (different anthers) i (h) 



Amorpha poptili austauti (h = 28) x 

 A. p. populi (m = 28). (Federley, 

 1915) 



30 

 61 



76 



68 



73 



I 



7 

 56 



23 





59 

 30 

 36 



n8 



100 



50 



50 



100 



100 



100 

 100 



91 

 141 



86 



