XXX North American Trees 



3. Leaves not heart-shaped; fruit not a legume 4 



4. Sap milky; twigs with sharp axillary spines; fruit a globose 



multiple of drupes 4—5 inches across .... MACLURA, p. 229. 



4. Sap watery ; twigs and fruit not as above 5 



5. Leaves obovate-lanceolate, 10-12 inches long; stipules absent; 

 buds minute; fruit a berry 3-5 inches long. . ASIMINA, p. 237. 



5. Leaves and fruit not as above 6 



6. Terminal bud present, conspicuous 7 



6. Terminal bud absent; lateral buds often minute 13 



7. Terminal bud large, with single caplike scale; leaves 4-30 inches 

 long; fruit conelike aggregate MAGNOLIA, p. 230. 



7. Terminal bud scaly; leaves 1-7 inches long; fruit simple 8 



8. Stipules present; fruit an acorn QUERCUS, p. 174. 



8. Stipules absent ; fruit not an acorn 9 



9. Leaves with arcuate veins; petioles long and slender; flowers 

 small in cymes; fruit a drupe CORNUS, p. 331. 



9. Leaves with pinnate veins; petioles short 10 



10. Twigs with conspicuous white lenticels, aromatic if crushed; 

 leaves obtuse, oval to obovate, 4-6 inches long; fruit a dry 

 drupe 1/4 inch long COTINUS, p. 309. 



10. Twigs, leaves and fruit different 11 



11. Leaves oblong to obovate, 2-7 inches long; pith diaphramed; 

 fruit an oblong, fleshy drupe NYSSA, p. 327. 



1 1 . Leaves oblong, 2-4 inches long ; pith solid ; fruit a capsule ; 

 southeastern coasted plain 12 



12. Leaves 3-4 inches long, hairy below, early deciduous; twigs 

 without lenticels; fruit a globose, 3-5 celled capsule % inch 

 long ELLIOTTIA, p. 333. 



12. Leaves 2-3 inches long, smooth below, tardily deciduous; 

 twigs with lenticels; fruit 2-celled, capsule-like indehiscent, 

 1/8 inch CYRILLA, p. 293. 



13. Leaves unequal at base; pith chambered at nodes; fruit a dry 

 drupe CELTIS, p. 220. 



13, Leaves equal at base; pith solid; fruit not a dry drupe 14 



14. Stipules or their scars present 15 



14. Stipules absent 18 



15. Buds with single caplike scale; fruit a capsule. . .SALIX, p. 130. 



15. Buds scaly or naked; fruit a drupe 16 



16. Twigs stout with thick pith; sap milky RHUS, p. 289. 



16. Twigs slender, often spinescent; sap watery 17 



17. Leaves Vi-^A inch long; drupe Vs inch; southwest 



CONDALIA, p. 317. 



17. Leaves 1-7 inches long; drupe V^-Vi inch. .RHAMNUS, p. 315. 



18. Leaves stellate-hairy below; buds naked, hairy; fruit a 

 drupe Vz inch long enclosed in persistent calyx; southeastern 



