'■'•I Field Manual 



Uk Capsules ovoid-pyramidal, 5-angled ; in large paniclcd 



racemes. Oxydendrum. (08). 

 17. I'Vuit a dry drupe, or drupe-like; exocarp softer than 



the bony endocarp. 48. 



17. h'ruit a nut or aehene, the pericarp mjt in 2 layers: 



often partly or completely enclosed in a cup or 

 husk. 49. 

 48. l^Vuit globose, :} in. or more in diameter, on winged 

 peduncles. Tilia. (20). 



18. b'ruit obliquely ovoid, compressed, ridged on the back 



and covered with prominent soft processes. 



Planera. (4!>). 

 48. l-ruit subglo'bose, nearly synnnetrical, i in. long. 



pubescent, red. Rhus. (42). 

 48. Fruit subglobose, nearly symmetrical. 8 in. long; 



light gray, stone striate. Toxicodendron. (43). 



48. Fruit obliquely oblong or oval, compressed, gibbous, 



% in. long, reticulate-veined. Cotinus. (44). 



49. Nut sharply 3-angled ; usually 2 together in the 4- 



valved bur. Fagus. (o4). 



49. Nut not 3-angled. 50. 



50. Nut less than \ in. long, somewhat compressed. 51. 



5(>. Nut large, more than 4 in. long, or if not then circular 

 in cross-section. 52. 



51. Nut with ridges; fruiting l)ract 3-cleft and incised. 



Carpinus. ( 57 ) . 



51. kidges of the nutlet inconspicuous, fruiting bract 



bladder-like. Ostrya. (58). 



52. Nut with 2 or 3 prominent ridges, sometimes with 



rough wrinkles. 53. 



52. Nut not with ridges. 54. 



53. Nut rugose or sculptured; husk indehiscent. 



Juglans. (1)2). 



53. Nut smooth or angled, husk at length splitting into 



segments. Hicoria. (61). 



54. Nut ovoid-oblong or subglobose ; cup with imbricated, 



more or less united bracts. Quercus. (5G). 

 •'t^. Xut plano-convex or rounded; bur glol)ose and very 

 l)rickly. Castanea. (55). 



