A KEY, BASED UPON THE LEAVES, 



Designed as an Aid in identifying the Species represented in Parts I to VII 

 inclusive, when out of Season for procuring the Flowers. 



N. B. As this key applies only to the species thus far represented in AMERI- 

 CAN WOODS it is important always to confirm identification by applying the 

 more detailed description given in its proper place. 



a. Deciduous Leaves. falling in autumn. 

 b. Simple Leaves. 



c. Laminate with well marked blade and petiole. 

 d. Main rib single pinnately veined. 

 e. Entire or nearly so, pointed at both ends and 

 /. Opposite 



3-5 in. long, thick, lustrous above 9. NYSSA MULTIFLORA. 



5-6 in. long, thin, dull above 8d. CATALPA BIGNONIOIDES. 



/ 8 . Alternate, and 

 g. Large, thinnish 



Oblong, 5-10 in. long, petioles 1-2 in. 



1. MAGNOLIA ACUMINATA. 

 Obovate-lanceolate, 6-12 in. long, petiole scarcely -J in. 



76. ASIMINA TRILOBA. 



gr 2 . Smaller, 2-7 in. , thickish and with 

 h. Whitish pubescence at least on the veins beneath. 



Petioles about 1 in. long (51. DIOSPYROS VIRGINIANA. 



Petioles about 4 inch long 110. NYSSA OGECHE. 



/I- 2 . Brownish pubescence on veins beneath, margins wavy. 



126. RHAMNUS PURSHIANA. 

 / 3 . Alternate opposite and scattered upon the same plant, linear. 



134. CHILOPSIS SALIGNA. 

 e 2 . Serrate, serulate or dentate. 

 /. Inequilateral and cordate or truncate at base. 

 {/. Ovate-orbicular, large, 4-5 in. or more in length. 



3. TILIA AMERICANA. 

 gr 2 . Ovate, long-taper-pointed from a broad base. 



12. CELTIS OCCIDENTALIS. 

 g 3 . Ovate-oblong and 



h. Very rough, especially above, rugose 11. ULMUS FULVA. 



ft 2 . Smoothish and 



i. 2-4 in. long, fruit in 



Fascicles 33. ULMUS AMERICANA. 



Racemes 34. ULMUS RACEMOSA. 



i s . 1-2 in. long and only slightly inequilateral. 



114. PLANERA AQUATICA. 



Flowers and fruit in fascicles 33. ULMUS AMERICANA. 



Flowers and fruit in racemes 34. ULMUS RACEMOSA. 



f* Equilateral and obtuse, rounded or cordated at base. 

 g. Veins straight or nearly so, leaves thinnish. 

 h. Ovate-oblong. 



Coarsely serrate with remote teeth, one at the end of each 

 vein, ciliate and covered with silky white hairs. 



16. FAGUS FERRUGINEA. 



