12 KEV, BASED UPON LEAVES. 



gr 2 . Deeply incised with more or less acute sinuses and narrow lobes. 

 h. Star-shaped, lobes glandular serrate. . 60. LIQUIDAMBAR STYRACIFLUA. 

 7* 2 . Palmate 



Lobes incisely toothed 26. ACER DASYCARPUM. 



Lobes furnished with 2-4 secondary lobes. .152. A. MACROPHYLLUM. 



/ 2 . Alternate, tendril bearing vine 78. VITIS AESTIVALIS. 



c 2 . Linear, sessile, in delicate 2-ranked sprays 119. TAXODIUM DISTICHUM. 



c 3 . Needle-shaped without distinction of blade and petiole short, about 

 1 in. in length, soft and in fascicles of many each.. 28. LARIX AMERICANA. 

 6 2 . Compound Leaves. 

 c. Palmate, with usually 



7 obovate leaflets 6. ^Escums HIPPOCASTANUM. 



5 oblong-lanceolate leaflets. . 127. JEscuLus CALIFORNICA. 



c s . Pinnate with an odd terminal leaflet, rachis 



d. Furnished with prickles 106. XANTHOXYLUM CLAVA-HERCULIS. 



d' 2 . Not furnished with prickles ; leaflets all 

 . Petiolulate, leaflets 

 /. 21-41, each with one or two pairs of glandular teeth at its base. 



4. AlLANTHUS GLANDULOSUS. 

 / 2 . 11-15, 



With prickle-like stipules, entire 80. ROBINIA PSEUD ACACIA. 



With foliaceous deciduous stipules 84. PYRUS SAMBUCIFOLIA. 



f z . 5-9, glabrous, coarsely serrate 157. SAMBUCUS OLAUCA. 



/ 4 . 7-9, ovate or lance-oblong, entire or obscurely serrate ; 



Petioles and branchlets glabrous 10. FRAXINUS AMERICANA. 



Petioles and branchlets velvety pubescent. .31. FRAXINUS PUBESCENS. 

 / 5 . 3-5 ; lateral leaflets 



Petiolulate, irregularly toothed 54. ACER NEGUNDO. 



Sessile, subentire 77. PTELEA TRIFOLIATA. 



e 2 . Sessile or subsessile 



/. Numerous (15-17) and pubescent, especially along the petiole and rachis. 

 g. Leaflets ovate-lanceolate, finely serrate; pubescence of short, rust-colored 

 clammy hairs; fruit. 



h. Subovoid, viscid pubescent 14. JUGLANS CINEREA. 



h*. Subglobose, nut 



Deeply sulcate 35. JUGLANS NIGRA. 



Obscurely subcate 190. JUGLANS CALIFORNICA. 



gr 2 . Leaflets lance-oblong, coarsely serrate; pubescence of copious, longer 



and white hairs 5. RHUS TYPHINA. 



/ 2 . 11-13 115. CARYA AQUATICA. 



f\ 5-11. 

 ff. 5, quite glabrous; fruit a ridged nut about 1 in. long with thick 



epicarp 36. CARYA ALBA. 



fir 2 . 5-7 or 9, 



h. Glabrous, epicarp thin; nut 



7i 2 . Small, thin shelled 91. CARYA MICROCARPA. 



Larger, moderately thick-shelled 85. CARYA PORCINA. 



Tomentose; fruit a samara 187. FRAXINUS OREGONA. 



y 3 . 7-9, epicarp thick and woody, leaflets 



Puberulent ; bark shaggy 64. CARYA SULCATA. 



Tomentose and odorous . . . .90. CARYA TOMKNTO*A. 



flr 4 . 7-11, 



Lanceolate, acute at base, minutely glandular and pubescent 



beneath 37. C. AMAR A. 



Oblong-lanceolate, glabrous, obtuse or rounded at base; fruit a 



samara, flat at base . . 62. FRAXINUS SAMBUCIFOLIA. 



b z . Decompound Leaves. 

 c. Petioles smooth or pubescent; pinnnae 

 d. Remaining on during the season; leaves 

 e. Regularly bipinnate: pinnae 

 f. 2, leaflets, 



4-6, small (2-3 lines long) 128. CERCIDUM TORREYANUM. 



12-30 or more, -1$ in. long 129. PROSOPIS JULIFLORA. 



