KEY, BASED Urox FRUIT. 21 



c 9 . Oblong-ovoid 2-valved capsule closely invested by persistent calyx. 



188. NlCOTIANA GLAUCA. 



a 2 . Aggregated Fruit composed of many carpels, either closed or opened and 



cohering or closely massed together, forming a 

 b. Cone. 



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

 (t. Scales many and spreading at maturity. 



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

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

 f/. Subterminal and scales 

 h. Thin at tip and unarmed; cones subcylindric and 



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



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



7/ 2 . Thickened at tip and 

 /. Armed with a recurved prickle. 



./. 1-3 in. long, cylindric ovoid, oblique 148. P. CONTORTA. 



j*. 3-6 in. long, glossy-brown, 

 /?. Elongated conical, separating from the tree by a fracture 



Within the peduncle 125. P. CUBENSIS. 



Within the base of cone 147. P. PONDEROSA. 



W. Broad-ovoid 197. P. TORREYANA. 



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



2 . Unarmed cones about 2 in. in length, seeds. 



Winged, about in. long 19. P. RESINOSA. 



Wingless, about in. long 196. P. MONOPHYLLA, 



</ 2 . Lateral and scales thickened at tip, cones 

 h. Slightly or not at all oblique 

 i. Ovoid-oblong; leaves 3-5 in. long; scales armed with a weak prickle 



directed 

 At about right angles from the axis of the closed cone. 



75. P. MITIS. 



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



'/*. Ovoid-pyramidal. 

 J. Prickles strong; cones 2 in. or 



Rather less in length ; leaves 1^-3 in. long ; branchlets purple. 



89. P. INOPS. 



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



j 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. CLAUSA. 



h- 2 . Markedly oblique 



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



2-3^ in. long, scales armed with strong prickles. . 170. P. MURICATA. 

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



199. P. RADIATA. 



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



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



169. P. COULTERI. 



c. 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. 



/. Maturing the first season the autumn after blossoming. 

 f/. Ovoid or oblong, ^ in. long, pendent ; bracts inconspicuous; scales per- 

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



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



21. TSUGA CANADENSIS. 

 */ 3 . Sub-cylindrical 



/*. Erect ; scales deciduous from the persistent axis (Abies). 

 i. 2-4 in. long ; leaves 



Less than 1-in. long 22. A. BALSAMEA. 



2 or more in. long 173. A . CONCOLOR. 



6 or 8 in. long 174. A. MAGNIFICA. 



