39 



Germination in per cent after 10 20 30 60 100 200 days 



Firms monticola 191 112. 015 21 (+31) 



190203. 2 2(+29) 



Murrayana, Sierra 

 Nevada 191112 4 21 31 51 63 (+32) 



Pinus Murrayana, Sierra 



Nevada 190809 3 18 21 (+70) 



PinusLambertiana 1909-10 000 55 88 (+ 1) 



1908-09 3 15 (-f- 7) 



Strobus 1905 06 82 95 



189697.... 14 63 86 



190203.... 10 29 (+34) 



The quite extraordinary difference in the germinating energy 

 of Pinus Murrayana from the Rocky Mountains and from the 

 Sierra Nevada is here particularly striking. The seed from the 

 former district has generally almost all germinated after 10 days; 

 the bad result in 1896 97 was fortunately exceptional. On the 

 other hand, the rate of germination of seed from the latter district 

 is very sluggish, for which reason the sowing of this seed in the 

 nursery often fails. As with the other more or less slow germina- 

 ting species, this seed should either be carefully prepared by 

 steeping and germination before sowing like Jeffreyi and Stro- 

 bus , or prepared for a year before sowing like Coulteri and 

 Lambertiana. 



The variation in seed weight according to the district (place of 

 origin) is often very remarkable. Murrayana seed, for instance, 

 from the Rocky Mountains, has an average weight per 1000 seeds 

 of 4.5 grams from the Sierra Nevada one of 10.7. 



The same thing is observed with regard to Pinus Monticola seed 

 from north west Idaho, near Canadian border, weighed in 1912 

 15 grams, while Californian seed weighed 32 grams. 



The seed weight of Pinus Jeffreyi (Pinus ponderosa var. Jeffreyi) 

 Pinus ponderosa and Pinus scopulorum (P. ponderosa var. sco- 

 pulorum) is 125.3, 46 and 30.4 grams respectively. 



It is perhaps doubtful if the separation of Pinus ponderosa 

 (seed from the coast of the Pacific) from the mountain form 

 P. scopulorum (seed from the Rocky Mountains) is justified ; 

 but in practice it is convenient and safe. Convenient, because all 

 triple names are troublesome; safe, because such easily confused 



