4 KEY, BASED UPON LEAVES. 



e. Petioled and margin 



Obscurely denticulate, 8 lines or less in length. .21. TSUGA CANADENSIS. 



Entire, revplute, 2-1 inch in length 144. TAXUS BREVIFOLIA. 



e 2 . Subsessile rigid and sharply bristle-pointed, about 1 inch long and gen- 



erally tapering from wide base 120. TORREYA TAXIFOLIA. 



1-3 inches long, of more nearly uniform width. 



145. TORREYA CALIFORXICA. 

 e 3 . Sessile, entire, keeled below 

 /'. Narrow linear, obtusely pointed 



f in. long or less 22 ABIES BALSAMEA. 



2-3 in. long 173. ABIES CONCOLOR. 



/*. Wide-linear, pungent at apex, f in. long or less 



143. SEQUOIA SEMPERVIRENS. 

 d-. Somewhat 2-ranked, short- petiolate 

 e. Articulated on a permanent-base and keeled above 



171. TSUGA PATTONIANA. 



e 2 . Breaking away entire and leaving permanent leaf-scars 

 f to 1 in. long ; winter buds - in. 



150. PSEUDOTSUGA TAXIFOLIA. 



f to 1 in. long ; winter buds -^ in. 



PSEUDOTSUGA MACROCARPA. 



c 2 . Scale-like or awl-shaped, imbricated and closely appressed 

 (I. In 4 ranks and making a conspicuously 



e. Flat two-edged branchlet 24. THUYA OCCIDENTALS. 



e 2 . Flattish but narrower branchlet 141. LIBOCEDRUS DECURRENS. 



e 3 , 4-angled rather than flat branchlet ; cone subglobose, with peltate val- 



vate scales ; cones about 



in. long 74. CHAM.ECYPARIS THYOIDES. 



$-1 in. long 166. CUPRESSUS GOVENIANA. 



l-l in. long 195. CUPRESSUS MACROCARPA. 



cf 2 . Ternate leaves 



Roundish at apex 166. JUNIPERUS CALIFORNICA. 



More acute at apex 168. JUNIPERUS OCCIDENTALS. 



d* Scattered, or spirally arranged, mostly carniate. . .142. SEQUOIA GIGANTEA. 

 c 4 . Laminate and 

 cl. Ovate to oblong 

 e. Single-ribbed 



f. 1-5 in. long, at base 



y. Rounded, truncate or slightly heart-shaped, 

 h. Pale or glaucous beneath, darker above. 



i. 1-1| in. long, spinose-dentate 156. PRUNUS ILICIFOLIA. 



1 2 . 2-3 in. long, entire 153. RHUS OVATA. 



1 3 . 3-5 in. long, entire 



Whitish beneath, flat 132 ARBUTUS MENZIESII. 



Greener beneath, curving lengthwise 180. RHUS LAURINA. 



1 4 . 2-4 in. long, undulately spinose-toothed 52. ILEX OPACA. 



h?. Tomentose and concave beneath ; margin 



. Entire and undulate 131. GARRYA ELLJPTICA. 



i' 2 . Both entire and spinose-toothed leaves on the same tree. 

 j. Lateral veins strongly impressed above, parallel and continuous to 

 the margins, which are serrate, or occasionally entire. 



138. QUERCUS DENSIFLORA. 



J 2 Not strongly impressed, and less parallel, pubescent at first beneath 



and finally 

 Glabrous, margin undulate, spinose-toothed 



137. QUERCUS AGRIFOLIA. 



Glaucous, sinuate spinose-dentate. ..161. QUERCUS CHKYSOLEIMS. 

 f/ 2 . Obtuse to acute, stiff, coriaceous, yellow-green beneath. 



176. RHAMNUS INSULARIS. 



g 3 . Cuueate at base, glabrous or nearly so beneath, slightly revolute, flat. 



159. UMBELLULARIA CALIFORNICA. 

 f' 1 . 6-12 in. long, thick, entire, acute at both ends. 



101. MAGNOLIA GRANDIFLORA. 



