KEY, BASED UPOK 



A KEY, BASED UPON THE FRDIT, 



Designed as an Aid in Identifying the Species represented in Parts I and II 

 when in Season for procuring the Fruit. 



N. B.- The remarks concerning the use of the Key based upon the Leaves are equally true 

 with reference to this. 



. Free Fruit formed by the ripening of a single pistil either simple or com- 

 pound. 

 b. Indehiscent pericarp. 



C. Samara dry, 1-celled, 1-seeded and with 1-2 membranous wings. 



(f. In terminal panicles; wing somewhat oblong-lanceolate, with a lenticular 

 seed at about its center, and beyond which the wing is twisted (Ailan- 



tJ ms } 4. A. GLANDTJLOSUS. 



tl*. In umbellate corymbs, each pedicel supporting a pair of samarse with 

 oblanceolate wings obtuse at the apex and with main rib on outer mar- 

 gin (Acer). 

 Fruit maturing in the fall, wings slightly divergent. 



7. A. SACCHARINUM. 



Fruit maturing in early summer, wings widely divergent. 



26. A. DASYCARPUM. 



d s . In axillary racemes or panicles, winged at the apex with a more or less 

 lanceolate obtuse wing (Fraxinus), terete at the base the seed portion and 



Petioles and brauchlets smooth 10. F. AMERICANA. 



velvety pubescent 31. F, PUBESCENS. 



d 4 . In lateral fascicles or clusters, winged all round (Ulmus). 



Sessile or nearly so, cell pubescent and margin not ciliate.. 11. U. FULVA. 

 In fascicles, cell smooth, margin densely ciliate . . . .33. U. AMERICANA. 



In racemes, cell pubescent, margin ciliate , 34. U. RACEMOSA. 



c 2 . Drupe or drupe-like and with a single seed. 

 (I. Fibro-neshy and dryish pericarp. 



e. Small, subglobose (Rhus} in terminal thyrses and clothed with crimson- 

 acid hairs .5. RHUS TYPHLNA. 



e 2 . Large, about 2 in. in length, with edible embryo (Juglans). 



Ovoid or oblong and clothed with brownish, fragrant-viscid hairs. 



14. J. CINEREA. 



Globose, roughly dotted (not viscid hairy) 35. J. NIGRA. 



rf' 2 . Fleshy pericarp. 

 e. Ovoid and 



Clustered two or three together on a single axillary peduncle; bluish- 

 black, stone striated 9. NYSSA MULTIFLORA. 



Racemed, bluish and with short, fleshy, reddish pedicels. 



32. SASSAFRAS OFFICINALE. 



