INDEX 



669 



•P. ayacahuite x P. flexilis 218, 



220,223,273 



x P. griffithii, syn. P. X 



holfordiana A.B. Jacks. 211, 

 222,273 



x P. strobus 211,223,273 

 •P. banksiana x P. contorta 450 

 •P. cembra x P. flexilis 543 



x P. griffithii 543 



x P. koraiensis 545 



x P. lambertiana 543 



x P. monticola 273 



x P. parviflora 543 



x P. pentaphylla 543 



x P. peuce 212 



x P. strobus 212 

 P. echinata x P. elliottii ^ n , 



577 



x P. taeda 471,577 

 P. elliottii x P. palustris 577 



x P. taeda 446 

 P. flexilis x P. griffithii 211, 



220,273 



x P. koraiensis 543 



x P. monticola 220,222,273 



x P. pentaphylla 543 



x P. peuce 543 



x P. strobiformis 220,222,273 



x P. strobus 212,220,273 

 P. griffithii x P. monticola 201, 



211,225,343,543 



x P. parviflora 274,543 



x P. pentaphylla 54 3 



x P. peuce 232,543,548 



x P. strobus, syn. P. X 



schwerinii Fitschen. 123, 201^ 

 211,234,237,245,257,259,264, 

 273,513-18,520-23,543,54 8,576 

 P. koraiensis x P. lambertiana 



127,212,223,273,543 



x P. monticola 273 



x P. strobus 212 

 ■P. lambertiana x P. pentaphylla 



545 

 •P. monticola x P. parviflora 225 



274 



x P. pentaphylla 543 



x P. peuce 201,212,225,232, 

 274,543 



x (P. peuce x P. strobus) 212 



x P. strobus 211,225,232,245, 

 274,543,554 

 •P. palustris x P. taeda, 

 Sonderegger pine 447 

 -P. parviflora x P. peuce 274 



x P. strobus 245,274,545 

 -P. pentaphylla x P. peuce 545 



x P. pumila, syn. P. X 

 hakkodensis Makino 185 

 x P. strobus 257, 265,267 

 --P. peuce x P. strobus 201,212, 

 232,233-34,236-37,247,257,259, 

 261-62.274,605 

 Piricularia oryzae Cov., rice blast 



fungus 479-80 

 Pissodes, conifer weevils 116,416 

 --nitidus Roelofs, on Pinus 



griffithii 193 

 --strobi Peck, white pine weevil 



204-206,208-209,211-12,232,265, 

 290,549,584,590-97,605-607,610, 

 629-30 

 Plant exploration 283 

 Plasmatype 572 

 Plasticity, see also Adaptation 28, 



151 

 Plateaus, yield or selection 652-53 

 Plectranthus rugosus Wall., spur-^" 



flower 154 

 Pleiotropy 8,594 

 Plus and minus strains, fungi, see 



Bipolarity 

 Plus tree selection, see Selection, 



phenotypic 

 Poa, bluegrass 84 

 Podocarpus neriifolius D. Don 167 



174 

 Pollen 



--contamination 612 

 --irradiation 552,554,558 

 --mixtures 574,588 

 --storage 548 



Pollination, general 21,165,168, 

 171-73,176-77,199,577,610,627 

 Pollution, air 20,204,209,211,590 

 Polycrosses 573-74,582 

 Polycyclic tests 43,47-48 

 Polygenes, see also Resistance, 



polygenic 18,94,551 

 Polymorphism 458 



Polyphenyl oxidase 465 ,468-69 ,4~5-~4 

 Polyploidy 21,93,638-39 

 Poplar Council of America 284 

 Populus, poplars, cottonwoods and 

 aspens 168,175,313-15,520,419-50, 

 472,537,590,599-607,615 

 --alba L., white poplar 421,450,469 

 --balsamifera Muenehh., a balsam 



poplar 421 

 --deltoides Bartr., eastern cotton- 

 wood 284,419-20,422,424 ,450,599- 

 605 

 --grandi Jentata Michx. , bigtooth 



aspen 4 30 

 --maximowiczii Henry 419-20,427-28, 

 600-05 



