KEY, BASED UPON LEAVES. 15 



/ 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. 

 </ 2 . Not articulated to petiole which is 



Scarcely 1 in. long 158. RHODODENDRON CALIFORNICUM. 



H-3 in.' long 188. NICOTIANA GLAUCA. 



e*. Three-ribbed (Ceanothus), in length 



1-H in., oblong 151. C. THYRSIFLORUS. 



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



d 2 . Obovate to oblong. 



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



130. CERCOCARPUS PARVIFOLIUS. 

 2 to 5 in. long, with 



Entire re volute margin 117. QUERCUS VIRENS. 



Glandular-serrate margin 181, HETEROMELES ARBUTIFOLIA. 



d 3 . Ovate-orbicular, thick and obtuse at apex 179. RHUS INTEGRIFOLIA. 



d 4 . 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. 



/ 2 . Crenate-dentate (and entire) tomentose beneath. 



191. QUERCUS TOMENTELLA. 

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



192. QUERCUS WISLIZENI. 

 f 4 . Entire and leaves 



g. Opposite, glabrous beneath 112. OSMANTHUS AMERICANUS. 



j/ 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. 



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

 d 1 . Linear-lanceolate, with broad clasping base and sharp horny tip 



175. YUCCA ARBORESCENS. 



d 8 . Falcate and vertically disposed upon the branchlet. 



183. EUCALYPTUS GLOBULUS. 



d 9 . Peltate and pahnately 7 many-lobed 189. RICINUS COMMUNIS. 



d 10 . Flabellate, large and filiferous 200. WASHINGTONIA FILAMENTOSA 



6 2 . Compound, drooping and with 12-15 pairs of lanceolate leaflets. 



178. SCHINUS MOLLE. 



a 4 . Leaves Subpersistent evergreen southward, but more or less deciduous 

 northward, 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. 

 a 5 . Leaves wanting; branches green, jointed and flattened. .184. OPUNTIA TUNA. 



