KEY, BASED UPON LEAVES. 7 



h. Pale or glaucous beneath, darker above. 



i. 1-H in. long, spi nose- dentate 156. PRUNTJS IJJCIFOLIA. 



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



i 3 . 3-5 in. long, entire 



Whitish beneath, flat 132 ARBUTUS MENZIESII. 



Greener beneath, curving lengthwise IbO. RHUS LAURINA. 



t*. o_4 i n long, undulately spinose-toothed 52. ILEX OPACA. 



A 2 . Tomentose and concave beneath ; margin 



t . Entire and undulate 131. GARRYA ELLJPTICA. 



i 1 . 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-. Not strongly impressed, and less parallel, pubescent at first beneath 



and finally 

 Glabrous, margin undulate, spinose-toothed 



137. QUERCUS AGRIFOLJA. 



Glaucous, sinuate spinose-dentate 161. QUERCUS CHRYSOLEPIS. 



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



176. RHAMNUS INSULARIS. 



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



159. UMBELLULARIA CALIFORNICA. 

 /*. 6-12 in. long, thick, entire, acute at both ends 



101. MAGNOLIA GRANDIFLORA. 

 / 3 . 3-6 in. long, blade 

 g. 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. 

 f/ 2 . Not articulated to petiole which is 



Scarcely 1 in. long 158. RHODODENDRON CALIFORNICUM. 



H-3 in/long 188. NICOTIANA GLAUCA. 



*. Three-ribbed (Ceanothus), in length 



J-H in., ovate, branchlets terete . .202. C. SOREDIATUS. 



1-2 in., oblong, branchlets angular 151. C. THYRSIFLORUS. 



2-4 in., broad ovate 177. C. ARBOHEUS. 



cP. Obovate to oblong. 



1 to 1-J in. long, serrate above and entire at base. 



130. CERCOCARPUS PARVTFOLIUS. 

 1-3 in. long, blue-green 2 1 5. QUERCUS ENGELMANNI. 



2 to 5 in. long, with 



Entire revolute margin 117. QUERCUS TIRENS. 



Glandular-serrate margin. . . 181, HETEROMELES ARBUTIFOLIA. 



d 8 . Ovate-orbicular, thick and obtuse at apex 179. RHUS INTEGRIFOLIA. 



(I*. Lanceolate, lateral veins 



Parallel 182. LYONOTHAMNUS FLORIBUNDUS. 



Not parallel, 2-4 in. long 186. OLEA EUROPEA. 



d 5 . Lanceolate oblong. 

 e. 3-5 in. long, margin 



/. Crenate-serrate 102. GORDONIA LASIANTHUS. 



/ J . Crenate-dentate (and entire) tomentose beneath. 



191. QUERCUS TOMENTELLA. 

 f 3 . Sinuate-dentate (and entire) glabrous beneath, dark-green above. 



192. QUERCUS WISLIZENI. 

 /*. Entire and leaves 



g. Opposite, glabrous beneath 112. OSMANTHUS AMERICANUS. 



g j . Alternate and beneath 



Rusty-pubescent 113. PERSEA PALUSTRIS. 



Golden-scurfy beneath 139. CASTANOPSIS CHRYSOPHYLLA. 



e 9 . 2 in. long, entire, glandular beneath 108. CLIFTONIA LIGUSTRINA. 



d*. Oblanceolate, serrate, with short stout petioles .164. MYRIC A CALIFORNICA. 

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



175. YUCCA ARBORESCENS. 



