i. Bud at end of twig very obliquely unsym- 



metrical, mucilaginous when chewed 



TILIA, p. 201. 



ii. Bud at end of twig symmetrical, not muci- 

 laginous when chewed. 



j. Bud-scales 2-3 visible; pith star-shaped in 

 cross-section ; sap not milky ; fruit a 



prickly bur, present ; large tree 



CASTANEA, p. 95. 



jj. Bud-scales 4-8 visible; pith not star- 

 shaped in cross-section ; sap milky ; fruit 



berry-like, not present; small tree 



MORUS, p. 135- 



xxxn 



