34 KEY, BASED UPON FRUIT. 



A KEY, BASED UPON THE FRUIT, 



Designed as an Aid in Identifying the Species of this Series 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 com- 

 pound. 

 b. Indehiscent pericarp. 



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



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

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



(Ailanthus) 4. A. GLANDULOSUS. 



dd. 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) 7. A. SACCHARINUM. 



ddd. 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 18. F. AMERICANA. 



dddd. In lateral fascicles or clusters, winged all round (Ulmus) very short 

 pedicillate, nearly orbicular and margin not ciliate. 11. U. PULVA. 

 CC. Drupe or drupe-like and with a single seed. 

 d. Fibro fleshy and dryish pericarp. 



e. Small, subglobous (Rhus), in terminal thyrses and clothed with crimson 

 acid hairs 5. R. TYPHINA. 



ee* Large, about 2 in., with edible embryo (Jnglans), ovoid or oblong, one or 

 several together, sessile on a terminal peduncle, clothed with 



brownish, fragrant- viscid hairs 14. J. CINEREA. 



dd. Fleshy pericarp. 



. Ovoid, with striated stone (Nyssa), bluish black, about six lines in 

 length, usually -clustered two or three together on a single 

 axillary peduncle 9. N. MULTIFLORA. 



ee. Globular, purple, small, solitary and of sweet flavor (Celtis). 



12. C. OCCIDENTALIS. 



ccc. Drupe-like but containing more than one seed, subglobose. 



d. Five-seeded and crowned with the persistent calyx-teeth and styles (Aralia), 



purple-black, numerous, in panicked umbels 8. A. SPINOSA. 



dd. Two to five-seeded, bluish black with white bloom, scaly bracted under- 

 neath (Juniperus) 25. J. VIRGTNIANA. 



CCCC. Nut hard, single coat, and furnished with an involucral cup or covering. 



