78 KEY, BY MEANS OP THE LEAVES, TO THE TREES, ETC. 



8. Pinnate. 



Stem weak, climbing and scrambling, often trained 

 against walls. 

 Stem more or less prickly. Leaves stipulate. .Rose, 197, 203 



Entirely without prickles and stipules Clematis, 90 



Stem erect and independent. 

 a. Leaflets 7, aromatic when bruised (large tree) Wahiut, 384 

 6. Leaflets 5, smelling disagreeably when 



bruised Elder, 324 



c. Leaflets very numerous, smelling dis- 



agreeably Ailantus, 572 



d. No remarkable scent. 



Leaflets entire. 

 Stipules converted into large thorns. . . .Robinia, 184 



Stipules inconspicuous Bladder Senna, 185 



Leaflets serrate. 

 Leaflets 5 to 7. 



Leaves opposite Bladder-nut, 157 



Leaves alternate Rose, 197 



Leaflets 7 to 11 Ash-tree, 219 



Leaflets 11 to 19, or many more. 



Twigs very woolly ; leaflets mostly 23. .Sumach, 152 

 Twigs glabrous Mou7itain-ash, 189 



4. Doubly or triply pinnate or pinnatifid. 



Branches armed with enormous thorns Gleditschia, 172 



Branches thornless Elder, var. laciniata, 325 



5. Simple and lobed, with only one principal vein 



from the base. 

 Extremity of leaf cut ofi" almost horizontaWj,. Tulip-tree, 97 

 Extremity rounded or pointed. 



Branches spinous Thorns, 188, 189 



Branches not spinous. 

 Leaves remarkably white underneath. 



Featlier- veined Pyms hyhrida, 189 



Lateral veins irregular. (Fig. 195) .... White Poplar, 380 

 Green on both surfaces. 



Leaves opposite White Jessamine, 233 



Leaves alternate. 



Bark of trunk smooth Beech, var. laciniata, 865 



Bark rugge<l Oaks (Figs. 26, 189), 365 



6. Simple and regularly fan-lobcd. 



a. Stems twining I^op, 356 



b. Stems climbing, but not twining. 



By means of suckers. (Fig. 181) Ivy, 310 



By means of tendrils. 



Large stipules Blue Passion-flower, 140 



No stipules Grape Vine, 151 



