KEY, BASED UPON LEAVES. 13 



C. In 4 ranks and making a conspicuously 



Flat two-edged branchlet 24. THUYA OCCIDENTALS. 



Flattish but narrower branchlet 141. LIBOCEDRUS DECURRENS. 



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

 vate scales ; cones 



Small, about in. in diameter 74. CHAM^CYPARIS THYOIDES. 



Larger, & to 1 in 166. CUPRESSUS GOVEMANA. 



c 2 . Ternate leaves 



Roundish at apex 166. JUNIPERUS CALIFORNICA. 



More ac Jte at apex 168. JUNIPERUS OCCIDENTALS. 



c. 3 Scattered, or spirally arranged, mostly carniate. .142. SEQUOIA GIGANTEA. 

 6 4 . Laminate and ovate to obovate 

 c. i to H in. long 



With single midrib, serrate above and entire at base 



130 CERCOCARPUS PARVIFOLIUS. 

 Three-ribbed, serrate above and at base 



151. CEANOTHUS THYRSIFLORUS. 

 c 2 . 1-5 in. long. 



d. Rounded, truncate or slightly heart-shaped at base. 

 e. Pale or glaucous beneath, darker above. 



1-H in. long, spinose-dentate 156. PRUNUS ILICIFOLIA. 



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



3-5 in. long, entire, flat 132 ARBUTUS MENZIESII. 



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



e 2 . Tomentose and concave beneath ; margin 



/. Entire and undulate 131. GARRYA ELLIPTICA. 



/*. Both entire and spinose toothed leaves on the same tree. 



</. Lateral veins strongly impressed above, parallel and continuous 

 to the margins, which are serrate, or occasionally entire. 



138. QUERCUS DENSIFLORA. 



0r 2 . Not strongly impressed, and less parallel, pubescent at first be- 

 neath and finally 

 Glabrous, margin undulate, spinose-toothed. 



137. QUERCUS AGRIFOLIA. 



Glaucous, sinnate spinose-dentate. . .161. QUERCUS CHRYSOLEPIS. 

 cZ 2 . Cuneate at base glabrous or nearly so, beneath, 



Markedly revolute margins 117 Q. VIRENS. 



Slightly revolute, flat 159. UMBELLULARIA CALIFORNICA. 



c 3 . 6-12 in. long, thick, entire, acute at both ends 



101. MAGNOLIA GRANDIFLORA. 

 c 4 . 3-6 in. long, blade 



d. Articulated to the petiole, which is 



Conspicuously winged ; stamens usually 20. 



103. CITRUS AURANTIUM. 

 Slightly, if at all, winged ; stamens usually 35. 



104. CITRUS LIMONUM. 



d*. Not articulated to petiole. . 158. RHODODENDRON CALIFORNICUM. 



b 5 . Lanceolate oblong. 

 c. 3-5 in. long, margin 



d. Crenate-serrate 102. GORDONIA LASIANTHUS. 



d*. Entire and leaves 



e. Opposite, glabrous beneath 112. OSMANTHUS AMERICANUS. 



e 2 . Alternate and beneath 



Rusty-pubescent 113. PERSEA PALUSTRIS. 



Golden-scurfy beneath 139. CASTANOPSIS CHRYSOPHYLLA. 



e 2 . 2 in. long, entire, glandular beneath 108. CLIFTONIA LIGUSTRINA. 



ft 6 . Oblanceolate. serrate, with short stout petioles .164. MYRIC A CALIFORNICA. 

 6 7 . Linear-lanceolate, with broad clasping base and sharp horny tip. 



175. YUCCA ARBORESCENS. 



a*. Leaves Subpersisten Evergreen southward, but more or less deciduous 

 north waiM, or individual trees shedding their leaves while most of the 

 trees do not 



Narrow obovate ; 1-3 in. long 107. CYRILLA RACEMIFLORA 



Lanceolate to oval, 3-6 in. long, glaucous beneath.. 51. MAGNOLIA GLAUCA. 



