Germination of Forest Trees 47 
It is evident from this table that the two most drought endur- 
ing species are Pinus ponderosa (S. D.) and Pinus ponderosa 
(N. M.). While other species germinated in the dry soil their 
germination per cents. were very small. Among the intermediate 
species, as far as soil moisture goes, are Abies concolor, grandis, 
and lasiocarpa, Pinus contorta, Pinus ponderosa (Mon.), and 
Pseudotsuga taxifolia (Mon.). It is interesting to see that with 
one exception the only species that germinated in the dry culture 
were either Pinus ponderosa or Pseudotsuga taxifolia. The 
former from the Black hills, New Mexico, and Southern Idaho 
and the latter from New Mexico, Colorado, and Idaho. ‘The line 
is evidently drawn between Southern Idaho and Montana as to 
whether these species will germinate in the dry culture or not, 
since both species from Montana did not germinate in the dry 
culture. Another interesting fact is that there are no moisture- 
loving species in the Rocky Mountains so far as this classification 
and these species are concerned, since there are no species that 
germinated only in the wet soil. 
On page 46 are given the curves of Pinus ponderosa and 
Pseudotsuga taxifolia in their relation to soil moisture. These 
curves show that germination is delayed, the curve rises less 
rapidly, the period is shorter, and the final per cent. lower with 
a decrease in soil moisture. 
TABLE VI 
Tue Errect oF Soil Moisture oN GERMINATION 
Pacific Coast Species 
Dry Soil Medium Wet Soil Wet Soil 
Species galSulosigalsal—s|dalce|—s 
mt fA | 8 | aA | ae ey We. | Ye 
Pinus ponderosa (Calif.).......... — | — | — | 68 | 12 | 6.0) 42 | 67 | 61.0 
ALM UWS RI CHM ENUM torlopoke. eh a ees dies — |— | — | 80 © | TAO) Sr | 7 | 2a 
Pinws lambertvana... 3... 425.5 ss — | — | — | — | — | — | Fo | 36 Ds 
IEQUDS COOMA SOS 5 > Re SBE Ee — |— | — |} 90 8 | BO] 52 | dat |) 255 
INDIES UES EIGN 6 6 0 5 oa oa eae Be — | — | — | — | — | — | 44 | 52 | 18.0 
Libocedrus decurrens.............. 20 I |o.5 |— |]|— |—/] 20 | 73 6.0 
Sequoia washingitoniana........... er) 8) |) 2720 
DESUSONMELCLO PIV LLCS oars eee — |— | — | — | — | — | 66 | or 0.5 
IPUGCOWSUEREHSIS Rvs Wiehe tengo teteee ahs — | — | — | — | — | — |} 22 | 60 | 22.5 
UO TXOCCULENL ALIS ee ee ee = |) SS SS 
IPSEUGOISULM LAGLfOWWGs a ee — |— | — !— | — | — |! 22 | 28 | 6.0 
