32 KEY, BASED UPON LEAVES. 



A KEY, BASED UPON THE LEAVES, 



Designed as an Aid in Identifying the Species of this Series when out of Season 

 for Procuring the Flowers. 



N. B. In this Key no pretension is made to exclude species not of this series, and hence 

 it is necessary in all cases to confirm identification, by a careful comparison with the more 

 extensive description given of the species 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 piunately veined. 

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



/. Large, 5-10 in. long and tliinuish 1. MAGNOLIA ACUMINATA. 



ff. Small, 2-5 in. long, of thicker and firmer texture. 



9. NYSSA MTJLTIFLORA. 

 ee. Serrate or dentate. 

 /. Inequilateral and cordate or truncate at base. 



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



3. TILTA AMERICANA. 



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



12. CELT-IS OCCTDENTALIS. 



gg<J. Ovate-oblong, very rough, especially above, rugose. 



11. ULMUS pn.v \ 



ff. Equilateral and obtuse, rounded or only slightly cordate at base, thin 

 and straight-veined. 



g. Ovate-oblong, teeth remote, one at the end of each vein, ciliate and 

 covered with silky white hairs 16. FAGUS FERRUGTNEA. 



gg. Ovate, doubly-serrate, petioles downy and of aromatic flavor. 



17. BETULA LUTEA. 



f/f/f/. Orbicular-ovate, with large, irregular teeth and long petiole. 



18. POPULUS GRANDIDENTATA. 



eee. Pinnatifid or lobed. 

 /. Oval, moderately pinnatifid, lobes bristle-pointed. 15. QUERCUS RUBRA. 



//. Broad, truncate at both base and apex, and with two spreading lobes 

 on each side.. . 2. LIRIODENDRON TULIPIFERA. 



