38 



AMERICAN PINES PINUS 



These can be dealt with quite briefly, for none of the American 

 pines are of great importance for Europe. The highest and lowest 

 germinating capacity and germinating energy met with will be alone 



mentioned. Germination in per cent after 5 10 20 30 days 



Pinus aristata 190102 98 99 



190203 81 87 87 



Banksiana 190910 85 91 93 



191011 8 28 32 



cembroides 190607 84 87 88 



190102 4 14 



contorta 190910 10 51 92 (-f 6) 



190708 29 55 68 (+ 3) 



flexilis 1901 02 6 67 (+31) 



191112 9 40 56 (+24) 



inops 190607 19 89 93 94 



191112 7 36 (+4) 



insignis 190607 20 59 67 (+ 7) 



190506 9 24 28 (+ 3) 



mitis 1909 10 51 69 69 (+22) 



190102 1 3 10 (+46) 



Murrayana (Rocky M.) 190102 81 93 



189697 2 29 



palustris 1911 12 14 54 59 (+ 3) 



190809 1 2 (+ 5) 



ponderosa 191011 88 96 (+ 1) 



189091 1 11 12 



resinosa 190506 93 95 



190203 70 89 



rigida 190506 65 93 96 



190304 18 48 



scopulorum 190607 21 92 96 



190304 10 15 17 (+34) 



The slow germinating species behaved as follows: 



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



Pinus Coulteri 190607 . . 2 27 65 (+28) 



190809.. 53 84 



Jeffreyi 1909 10... 30 73 89 (+ 3) 



190506... 00 69 (+ 2) 



