Key to the Genera xxvii 



2. Leaves 1 inch or longer 3 



3. Leaves leathery; fruit an acorn. . .QUERCUS (in part), p. 174. 



3. Leaves thick; fruit a hairy capsule; Southwest 



FREMONTODENDRON, p. 321. 



4. Lower sufface of leaves conspicuously dotted with scales 



or glands 5 



4. Lower surface of leaf without scales or glands 8 



5. Leaves covered with yellow scales below; fruit a bur; West 

 Coast CASTANOPSIS, p. 171. 



5. Leaves glandular-dotted below ; fruit a capsule or drupe 6 



6. Leaves oblanceolate to oblong, 2-4 inches long, aromatic; 

 fruit a wax covered drupe MYRICA, p. 135. 



6. Leaves lanceolate, lV^-2 inches long, non-aromatic; south- 

 eastern coastal plain 7 



7. Fruit a 2-4 winged, indehiscent capsule. . .CLIFTONIA, p. 293. 



7. Fruit a dehiscent, oblong capsule LYONIA, p. 333. 



8. Fruit a linear achene tipped with a long, hairy style; western 

 CERCOGARPUS, p. 255. 



8. Fruit not as above 9 



9. Fruit an acorn in a cup; leaves leathery 10 



9. Fruit not an acorn 11 



10. Fruit cup scaly; leaves not woolly below 



QUERCUS (in part), p. 1 74. 



10, Fruit cup spiny; leaves woolly below; Pacific Coast 



LITHOCARPUS, p. 1 73. 



1 1. Leaves entire (rarely toothed on vigorous shoots) 12 



1 1 . Leaves toothed 23 



12. Leaves aromatic, 2-5 inches long; fruit a drupe 13 



12. Leaves not aromatic 14 



13. Calyx lobes persistent under fruit; southeastern 



PERSEA, p. 239. 



13. Calyx deciduous; California and Oregon 



UMBELLULARIA, p. 237. 



14. Sap milky; fruit a multiple; Florida FICUS, p. 229. 



14. Sap watery; fruit simple or aggregate 15 



15. Leaves red-woolly below, 5-8 inches long; flowers 6-8 inches 



across ; fruit an aggregate of follicles 



MAGNOLIA GRANDIFLORA, p. 233. 



15. Leaves not red-woolly; flowers smaller; fruit simple 16 



16. Flowers showy; fruit a glandular-hispid, 5-celled capsule; 



southeastern 17 



16. Flowers small, white or green; fruit fleshy or a small, 2- 



celled capsule 18 



17. Leaves 3^ inches long, flat, elliptic-lanceolate; twigs slender; 

 fruit less than V4 inch long KALMIA, p. 335. 



17. Leaves 4—12 inches long, revolute, oblong; twigs stout; fruit 

 1/2 inch long RHODODENDRON, p. 335. 



