Proceedings of the Ohio State Academy of Science 95- 



31. Twigs grayish-brown or reddish, usually zigzag; bark 

 mucilaginous fibrous ; buds rather flesh3^ usually 

 bright red ; medullary rays prominent when the bark 

 is removed ; the winged fruiting panicle often per- 

 sistent. Tilia. (61). 



31. Twigs glabrous or pubescent, reddish or yellowish - 

 brown; pith 5-angled. Castanea. (21). 



31. Twigs downy, grayish-green; pith white, cylindrical^ 



large; bark very fibrous. Broussonetia. (28). 

 T)2. Pith interruptedly diaphragmed, with cavities, small,, 

 greenish-white. Celtis. (25). 



32. Pith solid. 33. 



33. Terminal bud naked, elongated, tomentose ; buds promi- 



nently stalked, light gray ; twigs zigzag. 



Hamamelis. (29). 



33. Terminal bud absent, the twig showing a terminal self- 



pruning scar at the morphological tip ; or if present 

 then with scales ; buds not stalked. 34. 



34. Terminal bud present, long pointed ; leaf scar narrow 



contracted between the bundle scars. 



Amelanchier. (40) . 



34. Terminal bud absent, or if present then the leaf scar 



oval or semicircular. 35. 



35. Twigs dark reddish-brown, speckled, often zigzag; buds 



reddish-violet, often superposed or clustered ; leaf 

 scars not oblique but below the lateral bud. 



Cercis. (44). 



35. Twigs dark brown, not speckled; buds not superposed;. 



leaf scars oblique. 36. 



36. Bark smooth, trunk and large branches with peculiar 



fluted or projecting ridges ; bud scales brown, finely 

 pubescent ; staminate catkins in the bud in winter. 



Carpinus. (16). 



36. Trunk not with fluted or projecting ridges. 37. 



37. Bark of trunk scaling oiT like in the Sycamore ; twigs 



very slender; no catkins. Planera. (24). 

 37. Bark in rough ridges ; no catkins ; twigs and buds in 



