14: HOUGH'S AMERICAN WOODS. 



/ 3 . Deltoid-ovate coarsely crenate- serrate usually. 



Abruptly acuminate 48. POPULUS MONILIFERA. 



Shorter- pointed or acute 194. POPULUS FREMONTII. 



f 4 . Broadly deltoid 63, POPULUS DILATATA. 



rf 2 . Larger, subglobose and pubescent 218. POPULUS TRICHOCARPA. 



d 6 . Lanceolate or elliptic -lanceolate, 

 e. Smooth and capsules 



/. Sessile or nearly so 46. SALIX ALBA var. VITELLINA. 



/" 2 . With slender pedicels ; leaves pale. 

 ff. Glaucous beneath and petioles. 



h. Glandular 237. SALIX LASIANDRA. 



7i 2 . Not glandular and leaves. 



2-4 in. long finely serrate 71. SALIX AMYGDALOIDES. 



3-7 in. long obscurely serrate 140. SALIX LAEVIGATA. 



gr 2 . Pubescent beneath, entire or remotely serrate. .165. SALIX LASIOLEPSIS. 

 e 1 . Pubescent; capsules about. 



i in. long, ovate-lanceolate 193. SALIX NUTTALLII. 



i in. long. 



Oblong-ovoid glabrous 165. SALIX LASIOLEPSIS. 



Ovoid, pubescent 238. SALIX SITCHENSIS. 



c 3 . Linear compressed pods opening by two valves; pods 



4-5 in. long, \ in. broad, quite straight 80. ROBINIA PSEUD ACACIA. 



3-5 in. long, variously twisted; leaflets 



Rather distant 206. ACACIA DECURRENS. 



Crowded 227. ACACIA MOLLISSIMA 



2 in. long, in. broad, often curved into a circle. 



155. ACACIA MELANOXYLON. 

 c 4 . Torulose, straight or curved, pods 2-3 in. long, 1-3-seeded. 



204. PARKINSONIA MICROPHYLLA. 

 c 5 . Subcylindrical pods, long, opening by two valves. 



6-10 in. long, !/4 in. or less thick. . ". 134. CHILOPSIS s ALIGN A 



10-12 in. or more long, $ in. or more thick 89. CATALPA BIGNONIOIDES. 



c 6 . Very oblique and containing two winged seeds. . . 213. GREVILLEA ROBUSTA. 

 c 7 . Ovoid 5-valved capsule. 



Glabrous 102. GORDONIA LASIANTHUS. 



Covered with stinging hairs 226. FREMONTODENDRON CALIFORNICUM. 



C 8 . Subovoid follicles arranged 



In pairs, seed not suspended by a funiculus. 



182. LYONOTHAMNUS FLORIBUNDUS. 

 Not in pairs; seed suspended by a funiculus. 



106. XANTHOXYLUM CLAVA-HERCULIS. 

 c 9 . Three-lobed capsules dividing into three dehiscent cocci; (Ceanothus) 



leaves 

 d. 3-ribbed and length 



-j-U in., ovate; branchlets terete 202. C. SOREDIATUS. 



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



d*. Single- ribbed, 



1 in. long, branchlets terete coriaceous 201. C. SPINOSUS. 



2-4 in. long, branchlets slightly angled 177. C. ARBOREUS. 



c 10 . Top-shaped capsule, f in. in diam*., cells dehiscent at summits. 



183. EUCALYPTUS GLOBULUS. 

 c 11 . Hemispheric capsule, i in. in diam. cells dehiscent at summits. 



211. EUCALYPTUS ROSTRATA. 

 c 12 . Oblong-ovoid 2-valved capsule closely invested by persistent calyx. 



188. NICOTIAN A GLAUCA. 



c 13 . Baccate, dehiscent by 3 or 4 fleshy valves 228. CEREUS GIGANTEUS. 



a 2 . Aggregated Fruit composed of many carpels, either closed or opened and 



cohering or closely massed together, forming a 

 6. Cone. 



c. Scales of the cone open carpels (Coniferce). 

 d. Scales many and spreading at maturity. 



e. Imbricated and each subtended by a bract ; ovules 2, inverted, and 

 /. Maturing the year after flowering (Pinus); cones 

 g. Subterininal and scales 



