/O Cotyledons 425-5 cm. long, mostly 
8-10, 1-1.5 mm. wide, tapering, 
acute, the margins entire, light 
green but hardly glaucous; first 
14 leaves 2-2.5 cme long, finely 
i toothed along the margins, rather 
glaucous; seedlings 6-8 cm. tall. 
6 Cotyledons 5-7, 
commonly 4 
2 Cotyledons flat but commonly bearing a ridge 
G along the middle on the upper surface 
4 Cotyledons bearing minute white dots 
on the upper surface which is 
ridged along the middle, 1.5-2.5 cm. 
long, 15-2 mm. wide, blunt, entire, 
usually 4 or 5, less often 5 or 6; 
i) first leaves 8-10 mms long, white on 
the lower surface; seedlings 3-5 cm. : 
tall; hypocotyls red. Tsuga_ mertensiana: 
4 Cotyledons green and rather glossy on 
8 the upper surface. 
(, Primary stem distinctly white, the 
,cotyledons ridged along the 
‘middle on the upper surface, com- 
, monly 5-6, very slender and acute; 
q@ / first leaves less than 1.5 cm. 
/ long, flat, tipped with a hyaline 
in ¢ mucro, the lower surface white-dotted, 
\ the margins appearing translucent 
\\ When held to the light, the midvein 
‘very dark; seedlings 5-4 cm. tall Larix occidentalis 
a 
l, Primary stem not white 
8 Cotyledons 6-7 mm. longs, 1 mn. 
j/Wide, 5-4, narrowed at tne apex 
‘ put rather blunt, the first i 
/ leaves alternate, but appearing | 
/ whorled, blunt at tne apex, their 
/2( margins minutely serrulate, the 
\ teeth glandular-tipped, swollen 
\. and jointed at the base; primary 
\ stems puberulent; seedlings 1-2 
‘eme tall Tsuga hoterovhyllal 
