KEY, BASED UPON FRUIT. 15 



j*. Prickles weak; cones 2-3 in. long, and 



Wide-pyramidal; leaves in 3's 121. P. SEROTTNA 



Narrow-pyramidal; leaves in 2's. , 122. P. CLAUSA. 



h*. Markedly oblique 



2-in. or less in length, scales unarmed 99. P. BANKSIANA. 



2-3^ in. long, scales armed with strong prickles. . i70. P. MURICATA. 

 3-5 in. long, outer scales very gibbous; oblique. 



Ovoid, prickles minute and weak 199. P. RADIATA. 



Cylindrical ovoid, prickles stouter 222 P. ATTENUATA 



' 4-8 in. long: scales very strongly armed 198. P. SABINIANA. 



10-15 in. long, armed with very large, strong prickles. 



169. P. COULTERI. 



/. Maturing the first season the autumn after blossoming. 

 </. Ovoid or oblong, \ in. long, pendent ; bracts inconspicuous; scales per- 

 sistent on the' axis, thin and with eroded tip 20. PICEA NIGRA. 



g-. Ovoid, pendent; scales thin and entire at tip. 



Pedunculate, f-J in. long; cone scales orbicular oblong bracts 



truncate 21. TSUGA CANADENSIS. 



Sessile, f-1 in. long; cone-scales oblong; bracts cuspidate. 



223 TSUGA HETEROPHYIJLA. 



<7 2 . Ovoid, small (8 lines or less), pendent, scales rounded and entire at tip. 



21. TSUGA CANADENSIS. 

 g 3 . Subcylindricai 



h. Erect ; scales deciduous from the persistent -axis (Abies); bracts 

 i. Shorter than cone- scales; leaves with resin ducts 

 J. Within the parenchyma 



Cones 2f-4 in. long, purple 22. A. BALSAMEA. 



J 1 . Close to epidermis of lower side; cones 

 k. 2-5 in. long; leaves 



Dark-green above, flat, flexible and conspicuously emarginate. 



224. A. GRANDIS. 

 Blue-green above, flat, rounded or acuminate at apex. 



173. A. CONCOLOR. 



& 2 . 6-9 in. long; leaves blue-green, 4-sided 174. A. MAGNIFICA. 



i 2 . Longer than the cone scales reflexed and nearly covering them; 



cones 6-8 in. long; leaves grooved 225. ABIES NOBLLIS. 



h?. Nodding, small (about 2 in. long), scales persisting on the axis and 



entire at tip 100. PICEA ALBA. 



h 3 . Pendent, 1^-3 in. long, scales incisely denticulate. 



149. PICEA SITCHENSIS 

 gr 4 . Cylindrical oblong; bracts much exserted (Pseudotsuqa) : cones 



2-3 in. long 150 P. TAXIFOLIA. 



5-8 in. long 172. P. MACROCARPA. 



g 5 . Ovoid or roundish, small, 9 lines or less in length, scales persistent on 



the axis at maturity 23. LARIX AMERICANA. 



e 2 . Valvate, bractless, wedge-shaped, spreading, each with 3-7 inverted 

 ovules ; cone woody, oval and 



2-3 in. long, scales usually 25-30 142. SEQUOIA GIGANTEA. 



1 in. or less, scales short, 20 143. SEQUOIA SEMPERVIRENS. 



f. Scales few. persistent, bractless ; cone 



e. Oblong and erect, with scales more, or less thickened at tip, 

 /. Loosely imbricated, 8-12, thinnish. 



Four scales only fertile 24. THUJA OCCIDENTALIS. 



Six fertile 220. THUJA GIGANTEA. 



/. Valvate, 4-6, thick, only two scales fertile. 



141. LEBOCEDRUS DECURRENS. 

 e'. Globose or subglobose, maturing the 



/. First season, | in. in length 74. CHAJLECYPARIS THYOIDES. 



/.* Second season and 



$ in. in length; leaves conspicuously glandular. 



219. CUPRESSUS MACNABIANA. 



| in. : leaves obscurely glandular 166. CUPRESSUS GOVE ,IANA. 



1-1$ in. leaves obscurely glandular 195. CUPRESSUS MACROCARPA. 



