BREEDING OF WHITE PINE AT THE INTERSPECIES LEVEL 543 



Table 1. Single interspecific crosses of selected taxa within 

 the subgenus Strobus section Strobus of the genus Pinus 







Flowers 













polli- 



Cone set 



Empty seeds 



Full seeds 





Species 



nated 



percent 



per cone 



per cone 



P m 



strobus x P. strobus 



4856 



16.4 



8.9 



18.8 



a.' 



monticola x P. pentaphylla 



40 



22.5 



16.5 



5.5 



peuce x P. pentaphylla 



195 



26.1 



6.2 



7.2 



P. 



griffithii x P. pentaphylla 



140 



12.9 



14.8 



2.8 



a~ 



parviflora x P. griffithii 



19 



56.8 



2.0 



1.6 



?. 



strobus x P. parviflora 



1375 



55.5 



8.9 



6.0 



a — 



flexilis x P. pentaphylla 



19 







-- 



-- 



a P. 



centra x P. pentaphylla 



10 



70 



-- 



-- 



?. 



parviflora x P. cembra 



126 







-- 



-- 



a P 



parviflora x P. albicaulis 



550 



26.7 



-- 



-- 



a P. 



pentaphylla x P. larrbertiana 



106 



59.6 



-- 



-- 



P. 



monticola x P. monticola 



201 



1.0 



15.0 



1.5 



P. 



monticola x P. peuce 



668 



10.5 



54.4 



5.1 



P. 



monticola x P. griffithii 



54 







-- 



-- 



a P. 



griffithii x P. monticola 



24 



57.5 



-- 



-- 



P. 



monticola x P. strobus 



458 



15.7 



9.8 



10.1 



p 



strobus x P. monticola 



226 



.4 



-- 



-- 



a ?; 



monticola x P. cembra 



62 







-- 



-- 



p. 



peuce x P. strobus 



2862 



28.7 



15.4 



5.5 



p 



strobus x P. peuce 



5221 



17.4 



12.2 



10.2 



a p. 



peuce x P. griffithii 



7 



r> 



20.5 



1.2 



a p. 



peuce x P. flexilis 



25 



60.9 



-- 



-- 



p. 



griffithii x P. strobus 



756 



55. 7 



16.5 



4.7 



P t 



strobus x P. griffithii 



95 + 



(8.4) 



14.7 



5.0 



a p\ 



cembra x P. griffithii 



45 



60 



-- 



-- 



a x> 



armandii x P. albicaulis 



74 



54.1 



24.5 







a c 



arrriandii x P. larrbertiana 



79+ 



54.4 



100 



.6 



a. r 



cembra x P. albicaulis 



104, 

 55 b 



24.0 



19.8 



2.4 



a P. 



cembra x P. armandii 



15.1 



7.8 



.2 



a c 



cembra x P. flexilis 



52 







-- 



-- 



a t> 



cembra x P. koraiensis 



49 



81.6 



11.1 



1.1 



p. 



cembra x P. larrbertiana 



16 



18.7 



-- 



-- 



p. 



flexilis x P. cembra 



51 







-- 



-- 



?. 



flexilis x P. koraiensis 



10 h 

 524 b 







-- 



-- 



a p. 



koraiensis x P. albicaulis 



10.5 



2.9 



.2 



a p. 



koraiensis x P. armandii 



54 







-- 



__ 



a p. 



koraiensis x P. cembra 



51 







-- 



-- 



a ?. 



koraiensis x P. flexilis 



44 



20.4 



-- 



-- 



p. 



koraiensis x P. larrbertiana 



644 



9.8 



1.5 



2.5 





a 



. new cross 



b , , . j. . j , ., , 











hybridity doubtful 



