Key to the Families. 



PAGE 



Leaves linear or scale-like Pinace^ 97 



Leaves not as above. 

 A. Leaves compound. 



Leaves palmately compound Aesculace^ 313 



Leaves pinnately compound. 



Leaves without an odd leaflet at the end Caesalpinace^e 288 



Leaves with an odd leaflet at the end. 

 Leaves alternate. 



Leaflets toothed all around Juglanpace^ 129 



Leaflets-entire, or with 1-4 teeth near the base. 

 Trees with thorns, leaflets entire, generally 



less than 4 cm. (13^2 inches) long Fabace^ 296 



Trees without thorns, leaflets entire or with 

 1-4 teeth near the base, generally longer 



than 4 cm. (13^ inches) Simaroubace^ 299 



Leaves opposite. 



Leaflets 3-5, fruit not bi-symmetrical Acerace^ 301 



Leaflets 5-11, fruit bi-symmetrical Olevcete 329 



A. Leaves simple. 



Leaves opposite or whorled. 



Petioles more than 4 cm. (13^ in:!hes) long. 



Blades palmately 3-5 lobed Acerace^ 301 



Blades entire or with 1 or 2 lateral lobes Bignoniace^ 342 



Petioles less than 4 cm. (13^ inches) long. 



Flowers 4-parted, stone of fruit round Cornace^ 321 



Flowers 5-parted, stone of fruit flattened Caprifoliace^ 349 



Leaves alternate. 

 B. Leaves entire. 



Trees with thorns and a milky sap Toxylon in 



Morace^ 228 



Trees without thorns, sap not milky. 

 Leaves 3-5 nerved at the base. 



Leaves 3-nerved at the base Celtis in 



Ulmace^ 220 



Leaves 5-nerved at the base Cercis in 



Caesalpinace^ 288 



Leaves with 1 primary nerve. 



Leaves usually more than 1.5 dm. (6 inches) 

 long, flowers solitary. 

 Flowers appearing before or with the 



leaves Anonace^ 234 



Flowers appearing after the leaves Magnoliace^ 230 



Leaves less than 1.5 dm. (6 inches) long, flow- 

 ers in clusters. 



Bark and leaves aromatic Laurace^ 236 



Bark and leaves not aromatic. 



Fruit dry, an acorn Quercus imbricaria 



IN Fagace^ .. , 207 



[7-284151 (,5) 



