STORKS AGRICULTURAL EXPERIMENT STATION. 331 



29. Pith wide, brown, with hollow chambers; fruit a nut ........... 30 



29. Pith narrow, light colored; fruit a small stone-fruit ........... 31 



30. Downy patch present above leaf-scar; nut elongated ............... 



.................. ................. Butternut (Juglans ciwereojp.398 



30. Downy patch absent from leaf-scar; nut round ................ ... 



................... ............. Black Walnut (Juglans 



31. Pith with hollow chambers; buds brown, terminal bud absent, 

 lateral buds appressed ....... Hackberry (Celtis occidentalis) p.464 



31. Pith with woody partitions in the solid ground-mass; buds reddish, 

 terminal bud present, lateral buds divergent ..................... 



..................................... Tupelo (Nyssa sylvatica)p.554 



32. Leaf-scars regularly 2-ranked, i.e. arranged in 2 longitudinal rows 

 on the twig .................................................. 33 



32. Leaf-scars regularly more than 2-ranked, i.e. in more than 2 rows 

 on the twig .................................................. 49 



33. Terminal bud absent (the last lateral bud may appear to be ter- 

 minal but absence of terminal bud is shown by small scar at 

 end of twig) ................................................. 39 



33. Terminal bud present ........................................ 34 



34. Buds stalked ................................................. 35 



34. Buds not stalked ............................................. 36 



35. Buds, for the most part naked, i.e. with undeveloped leaves serving 

 the function of scales; woody, 4-parted fruits and the remains of 

 last season's flowers generally present ............................. 



.......................... "Witch Hazel (Hamamelis virginiana)v.47S 



35. Buds covered with bud-scales; fruit a woody cone-like catkin ..... 

 ................................................ Alder (Alnus) p.426 



36. Stipule-scars nearly encircling twig; buds long and narrow, 

 generally over 5 times as long as wide, divergent; bud-scales in 

 pairs, 4-ranked, 10 or more scales visible; bundle-scars 5 ......... 



.............................................. Beech (Fagus) p.428 



36. Stipule-scars when present relatively short; buds stouter, generally 

 not over 4 times as long as wide; bud-scales less numerous .... 37 



37. Leaf-scars very narrow, V-shaped, swollen at the 3 bundle-scars; 

 buds long, appressed; bud-scale tipped with dark point; stipule- 

 scars absent ........... Shad Bush (Amelanchier canadensls) p.492 



37. Leaf-scars relatively broad; buds shorter; bud-scale without con- 

 spicuous dark point; stipule-scars present though often incon- 

 spicuous ...................................................... 38 



38. Bundle-scars 3; bark of young stem and branches with horizon- 

 tally elongated lenticels, often peeling into papery layers; pith 

 generally elliptical often with irregularly toothed edges; fruit a 

 catkin, immature catkins generally present on tree in winter ..... 

 ............................................... Birch (Betula) 104 



38. Bundle-scars several; lenticels not horizontally elongated; bark 

 never peeling in papery layers; pith more or less 5-pointed, star- 

 shaped; fruit a bur ............... Chestnut (Castanea dentata)*.43Q 



39. Leaf-scar almost entirely surrounding the buds; buds brown, 

 hairy, several massed together to form a bud-like cone; bundle- 

 scars raised, generally 5 in a single curved line ................... 



.............................. Yellow Wood (Cladrastis lutea) p.520 



39. Leaf-scar not more than half surrounding the bud; buds not massed 

 together into a hairy cone ................................... 40 



40. Bundle-scars 3 or more in a single curved line ................ 43 



40. Bundle-scars more than 3 in a closed ellipse, double line, vari- 

 ously clustered or irregularly scattered ....................... 41 



41. 2-3 scales visible to a bud; bundle-scars not prominently pro- 

 jecting ........................................................ 42 



41. 4 or more scales visible to a bud; bundle-scars rather prominently 

 projecting ................................. Mulberry (Morus) 140 



42. Twigs usually zigzag; pith roundish; buds and twigs mucilaginous 

 when chewed; fruit spherical, woody, about size of pea, attached to 

 a leafy bract ................................ Linden (Tilia) p.550 



