Key to the Genera xxxi 



coastal plain STYRAX, p. 343. 



18. Leaves not stellate-hairy; buds scaly 19 



19. Twigs usually spinescent; leaves often fascicled on spur shoots; 

 drupe black BUMELIA, p. 339. 



19. Twigs not spinescent; spur shoots absent 20 



20. Leaves glabrous; fruit a large berry subtended by woody 



persistent calyx; bark conspicuously blocky 



DIOSPYROS, p. 341. 



20. Leaves woolly below; fruit a red drupe subtended by hairy 

 calyx; bark thin, scaly CORDIA, p. 359. 



D. LEAVES TOOTHED 



1. Buds naked, terminal present; leaves unequal at base, oval, 

 crenately toothed; flowers yellow, appearing in fall; fruit a 

 capsule HAMAMELIS, p. 241 . 



1. Buds scaly (sometimes naked in Rhamnus); flowers in spring. .2 



2. Fruit a nut in bur or cup; leaves mostly penniveined 3 



2. Fruit not in bur or cup 5 



3. Buds lance-shaped, %-l inch long, terminal present; nut triangu- 

 lar in spiny bur; bark thin, smooth, blue-gray. .FAGUS, p. 167. 



3. Buds ovoid to globose V8-V4 inch long; fruit rounded 4 



4. Buds with 2-3 visible scales, terminal absent; leaves with 

 sharp teeth; fruit in spiny bur CASTANEA, p. 169. 



4. Buds many scaled, terminal present; leaves with rounded or 

 short teeth; fruit in scaly cup QUERCUS, p. 174. 



5. Fruit a nut or nutlet in strobile or leafy involucre; terminal bud 

 absent 6 



5. Fruit a samara, capsule, pome, or drupaceous 10 



6. Nutlet in persistent woody strobile; buds with 2 visible scales 

 ALNUS, p. 156 



6. Nut or nutlet with leafy involucre or strobile; buds many 

 scaled 7 



7. Nutlets winged in deciduous strobile; bark with horizontal 

 lenticels, often papery BETULA, p. 146. 



7. Nut or nutlets unwinged in involucres ; bark not papery 8 



8. Nut large, edible, single; shrubby CORYLUS, p. 165. 



8. Nutlet small in loose leafy strobile; small trees 9 



9. Nutlet enclosed in bladder-like sac; bark thin, gray, shreddy. . . . 

 ^ OSTRYA, p. 163. 



9. Nutlet subtended by 3-lobed leafy involucre; bark smooth, 



blue-gray; stem fluted CARPINUS, p. 165. 



10. Leaves unequal at base; fruit a samara or woody drupe; 



terminal bud absent 11 



10. Leaves equal at base; fruit a capsule, pome, or drupaceous. 14 



1 1. Fruit a winged samara; leaves mostly doubly serrate 



ULMUS, p. 214. 



1 1 . Fruit a drupe ; leaves singly serrate 12 



12. Winter buds naked; fruit juicy; twigs often spinescent. . . . 

 RHAMNUS, p. 315. 



