8 KEY, EASED UPON FRUIT. 



A KEY, BASED UPON THE FROIT, 



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

 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. 



a. Free Fruit formed by the ripening of a single pistil either simple or compound, 

 b. IndeMscent pericarp. 



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



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

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



tkU8) 4. A. GLANDULOSUS. 



cZ 2 . In umbellate corymbs, each pedicel supporting a pair of samarae with 

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

 margin (Acer). 



e. Fruit maturing in the fall, wings slightly divergent. .7. A. SACCHARINUM. 

 e 2 . Fruit maturing in early summer. 



f. Large 1 in. or more, downy when young 26. A. DASYCARPUM. 



/ ?2 . Smaller, smooth, pendulous and 



Red, in umbels ". 53. A. RUBRUM. 



Greenish in racemes wings incurved 54. A. NEGUNDO. 



d 3 . In axillary racemes or panicles, winged at the apex with a more or less 



lanceolate obtuse wing (Fraxinus), 

 e. Terete at base (seed-bearing portion); branchlets and petiols. 



Smooth 10. F. AMERICANA. 



Velvety pubescent 31. F. PUBESCENS. 



e 2 . Flat wing extending along the seed- bearing portion. 



62. F. SAMBUCIFOLIA. 



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. 

 d. Fibre-flesh} and dryish pericarp. 



. Small, subglobose (Khus) in terminal thyrses and clothed with crimson- 

 acid hairs 5. Runs TYPHINA. 



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. 



d 2 . Fleshy pericarp. 

 e. Ovoid and 



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

 black, stone striated {>. NYSSA MULTTFLORA. 



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



32. SASSAFRAS OFFICINALE. 

 6 2 . Globular. 

 f. Purple or purplish black and 



Solitary, of a sweet sugary flavor 12. CELTIS OCCIDENTALS. 



Racemed (or partially so), of a vinous, slightly astringent flavor. 



29. PRUNUS SEROTINA. 



In umbels, larger, of vinous flavor 56. P. AVIUM. 



/ 2 . Red, small and very sour 55. P. PENNSYLVANICUM. 



C 3 . Drupe-like but containing more than one seed, subglobose and 

 d. Crowned with the persistent calyx-teeth. 



