Key to the Seedlings of the more common Gymnosperms. 
f Cotyledons constantly <, 
Z Cotyledons flat,15-20 mm. long, 2 mm wide, dark 
green but dull, tapering toward the apex, persistent 
the second year; first leaves similar to mature 
foliage but thinner and smaller; seedlings 5-4 cm. 
5 Cotyledons flat, 5-7 mm. longs, rounded at the apex, 
narrowed below the middle, green; first leaves in 
i, whorls of 3-4, 4-5 mm. long, soon reflexed; seedlings 
1-2 cm tallg 
O Cotyledons 3-12, rarely ever 2 
ZCotyledons distinctly triangular in cross-section 
4 Cotyledons 1 cm. long or less, less than 1 mn. 
in diameter, green; first leaves 6-8 mm. long, 
slender, acute, tipped with a translucent mucro, 
light green, their mrgins minutely and sparingly 
B serrulate, the teeth tipped with glands, jointed 
: nN .5 mie above the base, decurrent below the joint, 
the new growth of the stem whitish; seedlings 1-2 
cme tall@ 
LS 
4 Cot ister 2-5 cme long 
b Cotyledons commonly 6-10 
nl G Hypocotyls,sreen, cotyledons 2-2e5 cme long, 
pcm - T mm. wide or less, light green and rather 
$ slaucous, commonly 6-10, withered but often 
‘ persistent the second year, very acute, min- 
i ro utely and sparingly glandular, ciliolate 
$ toward the base; first leaves about 1 cm. long, 
| rather flat, acute, the margins minutely 
toothed; seedlings 4-5 cm. talle> 
@ llypocotylis prown, longitudinally striate; 
‘2 cotyledons 225-5 cn. lous 
| Ar. 1/2 Cotyledons }2.5-3 cme long,jmostly 8-10, 
: 1-1.5 um. wide, tapering, acute, the 
/4 / 
x 
margins entire, light green but hardly 
glaucous; first leaves 1-165 cm. long, 
finely tcotned along the margins, rather 
elaucous; seedlings 5-6 cm tall© 
Thuja Plicata d ie 
Picea Engelmannii 
Pinus monticola 
T 
Pinus albicaulis 
Btetetstinds ei Shea has 
