KEY, BASED UPON LEAVES. 



A KEY, BASED UPON THE LEAVES, 



Designed as an Aid in Identifying the Species represented in Parts I, n, III and 

 IV when out of Season for procuring the Flowers. 



X. B. As this key applies only to the species thus far represented in AMERICAN 

 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 Lc" ''*. 



C. Laminate with well-marked blade and petiole. 

 d. Main rib single pinnately veined. 

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

 f. Opposite 



3-5 in. long, thick, lustrous above 9. XYSSA MULTIFORA. 



5-6 in. long, thin, dull above 89. CATALPA BIGNONIOIDES. 



/ 2 . Alternate, and 

 ff. Large, thinnish 



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



Obovate-lauceolate, 6-12 in. long, petiole scarcely in. 



76. ASIMINA TRLLOBA. 



(f. Smaller, 3-6 in. long, thick, whitish and 



Glaucous beneath, lanceolate to oval 51. MAGNOLIA GLAUCA. 



Pubescent on veins beneath 61. DIOSPYROS VIRGINIANA. 



e-. Serrate, serulate or dentate. 



/'. Inequilateral and cordate or truncate at base. 

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



3. TILIA AMERICANA. 

 g-. Ovate, long-taper-pointed from a broad base. 



12. CELTIS OCCIDENT ALIS. 

 gr 3 . Ovate-oblong and 



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



//-. Smootbish and 



Flowers and fruit in fascicles 33. ULMUS AMERICANOS. 



Flowers and fruit in racemes 34. ULMUS RACEMOSA. 



/" 2 . Equilateral and obtuse, rounded or cordated at base. 

 f/. 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. 

 Doubly and sharply serrate, nutlet inclosed in a papery sac. 



41. OSTRTA VIRGIN ic A. 

 Unequally and sharply serrate, nutlet subtended by a leafy 



bract 42. CARPINUS CAROLINIANA. 



//-. Ovate and 



*. Finely and closely serrate, smooth, whitish and reticulate- veined 

 beneath 47. POPULUS BALSAMIFERA. 



