171 Leaflets not usually more than 5 cm. long, usually with hairs or 

 prominent veins on the under surface; buds superposed, 

 partly concealed by leaf-scar 



JAPAN PAGODA-TREE (SOPHORA) 



171 Leaflets 2-8 cm. long, not always hairy; winter-buds solitary, 



showing 2 or more often pale-margined scales (MAACKIA) 



172 Leaves irregularly and coarsely toothed, sometimes lobed 



PRIDE OF INDIA, VARNISH-TREE (KOELREUTERIA) 



172 Leaves toothed regularly although sometimes slightly, not lobed 173 



173 Leaflets not more than 13 HICKORY (CARYA) 



173 Leaflets 7-31 174 



174 Buds often scaleless ; juice of young leaves usually sticky or 



milky - SUMAC (RHUS) 



174 Buds and juice both not as just described 175 



175 Under surface of leaflets paler than upper, leaflets usually hair- 



less when mature : 1'^ 



175 Both surfaces of about the same shade or else hairy 177 



176 Height of buds more than twice their width ; leaf-scar narrow 



with down-curved upper margin 



MOUNTAIN-ASH (SORBUS) 



176 Height of buds not twice their width; leaf-scar wide, upper 



margin almost straight 



CHINESE BUCKEYE (XANTHOCERAS) 



177 Leaflets 4-10 cm. long, doubly toothed (PLATYCARYA) 



177 Leaflets usually single-toothed, or else more than 10 cm. long.. 178 



178 Lower margin of leaf-scar raised prominently above twig ; ma- 



ture leaves hairy on under surface, especially on mid-rib 

 and in axils of veins....WALNUT, BUTTERNUT (JUGLANS) 

 178 Lower margin of leaf-scar not much raised ; mature leaves not 



so hairy as above 1'" 



179 Buds 2-scalcd ; bundle-scars several, in 3 groups 



PECAN (CARYA) 



179 Buds usually scaleless; bundle-scars 3, hooked or curved 



WING-NUT. CAUCASIAN WALNUT (PTEROCARYA) 



26 



