18 
Key to the Families. 
[eeaviestineariorscaleslikets aeeiseen sas eae PINACE 
Leaves not as above. 
A. Leaves compound. 
Leaves palmately compound....................-.... AESCULACEX® 
Leaves pinnately compound. 
Leaves without an odd leaflet at the end.......... CAESALPINACE®.... 
Leaves with an oad leaflet at the end. 
Leaves alternate. 
Leaflets toothed all around.................... JUGLANDACER...... 
Leaflets-entire, or with 1-4 teeth near the base. 
Trees with thorns, leaflets entire, generally 
less than 4 em. (11% inches) long........ FABACEA........... 
Trees without thorns, leaflets entire or with 
1-4 teeth near the base, ene) lenber 
than 4. cm. (1% inches). . ..........SIMAROUBACE..... 
Leaves opposite. 
Leaflets 3-5, fruit not bi-symmetrical.......... AACERACE ener 
Leaflets 5-11, fruit bi-symmetrical.............OLEACEM........... 
A. Leaves simple. 
Leaves opposite or whorled. 
Petioles more than 4 cm. (14% inches) long. 
Blades palmately/3-5 lobed... 24.4455 ACERACH iRise aoe 
Blades entire or with 1 or 2 lateral lobes......... BIGNONIACEA...... 
Petioles less than 4 em. (1% inches) long. 
Flowers 4-parted, stone of fruit round............ CoRNACE A eee 
Flowers 5-parted, stone of fruit flattened......... CaAPRIFOLIACE@........ 
Leaves alternate. 
B. Leaves entire. 
Trees with thorns and a milky sap.............. TOXYLON IN 
Trees without thorns, sap not milky. 
Leaves 3-5 nerved at the base. 
Leaves 3-nerved at the base................. CELTIS IN 
ULMACER......... 
Leaves 5-nerved at the base................. CERcIS IN 
CAESALPINACE®..... 
Leaves with 1 primary nerve. 
Leaves usually more than 1.5 dm. (6 inches) 
long, flowers solitary. 
Flowers appearing before or with the 
MOA VES ae aah SuSE URC Re EOI OUDS Wrens i ANONACEM.......... 
Flowers appearing after the leaves......... MAGNOLIACE®......... 
Leaves less than 1.5 dm. (6 inches) long, flow- 
ers in clusters. 
Bark and leaves aromatic.................. LAURACES.......... 
Bark and leaves not aromatic. 
Hruitidinyacanyacornin. oss ei one QUERCUS IMBRICARIA 
IN F/ GACEA....... 
MoraceEa........ 
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