HOUGH'S AMERICAN WOOES. 



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



|-H in., ovate, branchiate terete .202. C. SOREDIATUS 



1-2 m., oblong, branchlets angular lol. C. THYRSIFLORUS. 



^3 ni 2 ~ 4 . ln " ^^ Vate 177 ' C ARBOJIEUS. 



a 3 . Obovate to oblong. 



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



180. CERCOCARPUS PARVIFOLIUS. 

 1-3 in. long, blue-green 215. QUERCUS ENGELMANNI 



2 to 5 in. long, with 



Entire revolute margin .117. QUERCUS VIRENS. 



Glandular-serrate margin 181, HETEROMELES ARBUTIFOLIA. 



a*. Ovate-orbicular, thick and obtuse at apex 179. RHUS INTEGRIFOLIA. 



d b . Lanceolate, lateral veins 



e l : ^ arallel - 182. LYONOTHAMNUS FLORIBUNDUS. 



6 2 . Not parallel. 



/. Opposite, 2-4 in. long . . . i 8 6. OLEA EUROPEA. 



/ \ Alternate and beneath 



Glabrous H-3 in. long 280. ARBUTUS ARIZONICA. 



White- tomentose, 2-4 in. long 235. QUERCUS HYPOLEUCA. 



d 9 . Lanceolate oblong. 



1-2^ in. long, entire or repand-serrate 234. QUERCUS EMORYI. 



&. 3-5 in. long, margin 



/. Crenate-serrate 102. GORDONIA LASIANTHUS. 



/ 8 . Crenate-dentate (and entire) tomentose beneath. 



191. QUERCUS TOMENTELLA. 

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



192. QUERCUS WISLIZENI. 

 / 4 . Entire and leaves 



g. Opposite, glabrous beneath 112. OSMANTHUS AMERICANUS. 



gr 2 . Alternate and beneath 



Rusty-pubescent 113. PERSEA PALUSTRIS. 



Golden-scurfy beneath 139. CASTANOPSIS CHRYSOPHYLLA. 



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



d' 1 . Oblanceolate, serrate, with short stout petioles .164. MYRICA CALIFORNICA. 

 d 8 . Linear-lanceolate, with broad clasping base and sharp horny tip, 



175. YUCCA ARBORESCENS. 



d 9 . Falcate and vertically disposed upon the branchlet. 



-i in. broad .211. EUCALYPTUS ROSTRATA. 



f-1 in. broad 183. EUCALYPTUS GLOBULUS. 



f? 10 . Peltate and palmately 7-many-lobed 189. RICINUS COMMUNIS. 



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



d n . Palraately 3-lobed with rufous stellate pubescence 



226. FREMONTODENDRON CALIFORNICUM. 

 6 2 . Compound, drooping and with leaflets. 



11-21, irregularly cut-lobed 213. GREVILLEA ROBUSTA. 



25-30, entire or remotely serrate 178. SCHINUS MOLLE. 



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

 northward 



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; stems green. 



Flat and jointed 184. OPUNTIA TUNA. 



Columnar, large and vertically ribbed 228. CEREUS GIGANTEUS. 



