Key to the Families. 



PAGE 



Leaves linear or scale-like PINACE^E 19 



Leaves not as above. 

 A. Leaves compound. 



Leaves palmately compound AESCULACE.E 251 



Leaves pinnately compound. 



Leaves without an odd leaflet at the end CAESALPINACE.E. . . . 226 



Leaves with an odd leaflet at the end. 

 Leaves alternate. 



Leaflets toothed all around JUGLANDACE^E 52 



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

 Trees with thorns, leaflets entire, generally 



less than 4 cm. (1 Yi inches) long FABACE.E 233 



Trees without thorns, leaflets entire or with 

 1-4 teeth near the base, generally longer 



than 4 cm. (1 J^ inches) . . SIMARUBACE.E 237 



Leaves opposite. 



Leaflets 3-5, fruit in pairs ACERACE^E 239 



Leaflets 5-11, fruit single O:LEACE,E 267 



A. Leaves simple. 



Leaves opposite or whorled. 



Petioles more than 4 cm. (1% inches) long. 



Blades palmately 3-5 lobed ACERACE^E 239 



Blades entire or with 1 or 2 lateral lobes BIGNONIACE.E 284 



Petioles less than 4 cm. (1 ^ inches) long. 



Flowers 4-parted, stone of fruit round CORNACE.E 259 



Flowers 5-parted, stone of fruit flattened CAPRIFOLIACE.E .... 288 



Leaves alternate. 

 B. Leaves entire. 



Trees with thorns and a milky sap MACLTJRA IN 



MORACE^E 155 



Trees without thorns, sap not milky. 

 Leaves 3-5 nerved at the base . 



Leaves 3-nerved at the base CELTIS IN 



ULMACE^E 146 



Leaves 5-nerved at the base CERCIS IN 



CAESALPINACE.E. . 227 

 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^E 161 



Flowers appearing after the leaves MAGNOLIACE.E. . . 155 



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