xxviii North American Trees 



18. Twigs spiny or spinescent; fruit a drupe 19 



18. Twigs not spiny or spinescent 20 



19. Leaves 1-3 inches long; drupe black, Vz inch long 



BUMELIA, p. 339. 



19, Leaves Vi-^r inch long; drupe red, 3^ inch long 



CONDALIA, p. 317. 



20. Fruit a 2-celled capsule Ye inch long; leaves oblong, 2-3 

 inches long; southeastern coast CYRILLA, p. 293. 



20. Fruit a fleshy drupe or berry 21 



21. Stipules or their scars present; fruit red to brown. . ILEX, p. 291. 

 2 1 . Stipules or their scars absent 22 



22. Fruit black, lustrous; southeastern. . . VACCINIUM, p. 337. 



22. Fruit orange, glandular coated; Far West 



ARBUTUS, p. 333. 



23. Leaves 3-nerved from base, 1-1 V^ inches long; flowers in corymbs ; 

 fruit a dry 3-lobed drupe; California. . . . CEANOTHUS, p. 317 



23. Leaves with pinnate veins; flowers and fruit not as above 24 



24. Stipules absent; southeastern coastal plain 25 



24. Stipules or their scars present 26 



25. Leaves 1-2V^ inches long, entire or obscurely toothed; flowers 

 small, white; fruit a berry K inch long. .VACCINIUM, p. 337. 



25. Leaves 3-6 inches long, finely or remotely toothed; flowers showy, 



2V^ inches across; fruit a capsule GORDONIA, p. 323. 



26. Leaves narrowly lanceolate; fruit a woody capsule H inch 

 long; southwestern VAUQUELINIA, p. 245. 



26. Leaves broader; fruit a drupe or pome 27 



27. Fruit an obovoid pome V3 inch long; California 



PHOTINIA, p. 258. 



27. Fruit a drupe; flowers and fruit not in panicles 28 



28. Twigs spinescent; terminal bud absent; leaves \-\V2 inches 

 long, mostly suborbicular with glandular spiny teeth; 

 southwestern RHAMNUS CROCEA, p. 317. 



28. Twigs not spinescent; terminal bud present; leaves 1-4 

 inches long, lanceolate to ovate 29 



29. Fruit V4 inch long; flowers in cymes or solitary; leaf scar with 

 single bundle trace ILEX, p. 291 . 



29. Fruit Vi-Vi inch long; flowers in racemes; leaf scars with 3 or 

 more bundle traces PRUNUS (in part), p. 257. 



V. LEAVES ALTERNATE, SIMPLE, AND DECIDUOUS 



A. LEAVES SCALELIKE, INCONSPICUOUS, OR WANTING 

 (p. xxviii) 



B. LEAVES LOBED (p. xxix) 



C. LEAVES ENTIRE (p. xxix) 



D. LEAVES TOOTHED (p. xxxi) 



A. LEAVES SCALELIKE, INCONSPICUOUS, OR WANTING 



1. Plants succulent (Cacti), with clustered spines 2 



1 . Plants treelike, woody 3 



