hh. Twigs brownish, not spicy-aromatic; bundle- 

 scar appearing as a large dot; terminal bud 



absent; pith chambered CELTIS, p. 131." 



gg. Bundle-scars 3 or in 3 compound, but distinct 

 groups. 



h. Terminal bud present. 

 i. Stipule-scars present, 

 j. First scale of lateral bud directly in front, 

 i. e., exactly above the center of the leaf- 

 scar; twigs brittle; pith somewhat star- 

 shaped in cross-section. POPULUS, p. 45. 

 jj. First scale of lateral bud not directly in 

 front, i. e., to one side of the center of the 

 leaf-scar; twigs not brittle; pith circular 



in cross-section PR'UNUS, p. 153. 



ii. Stipule-scars absent. 



j. Buds bright to dark red, the terminal 

 y^-Y^ inch long. 



k. Branches contorted, bearing many 

 short, spur-like branchlets; fruit an 

 apple an inch or more in diameter, light 



green PYRUS, p. 143 



kk. Branches not contorted, not bearing 

 short, spur-like branchlets ; fruit berry- 

 like, y 2 inch long, blue-black 



NYSSA, p. 209. 



jj. Buds brownish to gray, the terminal' ex- 

 ceeding *4 i ncn in length, 

 k. Buds narrow-conical, sharp-pointed; 

 leaf-scars small, narrow crescent- 

 shaped; twigs about 1/16 inch thick; 

 pith homogeneous; fruit berry-like, not 



present AMEDANCHIER, p. 149. 



kk. Buds broadly conical to ovoid, blunt- 

 pointed; leaf-scars conspicuous, broad- 

 ly 'heart-shaped; twigs about ^ indi 

 thick; pith chambered; fruit a nut, 



often present JUCLANS, p. 61. 



hh. Terminal bud absent (sometimes present on 

 short shoots of Betula). 



XXIX 



