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 ; large tree 



.CAS-TANEA, 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 



