KEY, BASED UPON FRUIT. 19 



c 5 . Ovoid, 5-valved capsule 102. GORDONIA LASIANTHUS. 



c 6 . Subovoid follicle with seeds suspended by f uuiculi when ripe. 



106. XANTHOXYLUM CLAVA-HERCULIS. 



2 . Aggregated fruit composed of many carpels, either closed or opened and co- 

 hering or closely massed together, forming a 

 b. Cone. 



c. Scales of the cone open carpels (Coniferce). 

 d. Scales many and spreading at maturity. 



e. Imbricated aud each subtended by a bract ; ovules 2, inverted, and 

 /. Maturing the year after flowering (Pinus) ; cones 

 g. Subterminal and scales 



h. Thin at tip and unarmed; cones sub-cylindric and 



4-6 in. long 49. P. STROEUS. 



12-18 in. long 146. P. LAMBERTIANA. 



h?. Thickened at tip and 

 i. Armed with a recurved prickle. 



J. 1-3 in. long, cylindric ovid, oblique 148. P. CONTORTA. 



j' 1 . 3-6 in. long, glossy-brown, separating from the tree by a 

 fracture 



Within the peduncle 125. P. CUBENSIS. 



Within the base of cone 147. P. PONDEROSA. 



j 3 . 6-10 in. long 124. P. PALUSTRIS. 



i 2 . Unarmed cones about 2 in. in length, straight. . . 19. P. RESINOSA. 

 jy 2 . Lateral and scales thickened at tip; cones 



h. Ovid-oblong; leaves 3-5 in. long; scales armed with a weak prickle 



directed 



At about right angles from the axis of the cone. . . .75. P. MITIS. 

 Forward, at about 45 or less from the axis. . 123. P. GLABRA. 

 W. Ovoid-pyraniidal. 



i. Prickles strong; cones 2 in. or 



Rather less in length; leaves l-3 in. long; branchlets purple. 



98. P. INOPS. 



Rather more; leaves 3-5 in. long 50. P. RIGIDA. 



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



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



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



h 3 . Ovoid-acuminate, less than 2 in. long and scales unarmed. 



99. P. BANKSIANA. 



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. 



C 3 . 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. PICE A NIGRA. 



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



21. TSUGA CANADENSIS. 

 f 3 . Cyclindrical, 



Erect, large (2-4 in.), and scales finally falling away from the axis. 



22. ABIES BALSAMEA. 



