12 KEY BASED UPON FRUIT. 



e 2 . Ovoid-oblong, 1-1 in. long, stone compressed ... 81. PRUNUS NIGRA. 

 e 3 . Globular. 

 f t Purple or purplish, black and 



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



gr 2 . Racemed (or partially so), of a vinous, slightly astringent flavor. 



29. PRUNUS SEROTINA. 

 gr 3 . In umbels, larger, of 



Acid-vinous flavor, \ in. in diameter 82. PRUNUS CERASUS. 



Sweet- vinous flavor, f in. in diameter 56. PRUNUS AVIUM. 



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



e 8 . Drupe-like but containing more than one seed, subglobose and seeds 

 d. Inclosed in a bony, 2-3-celled stone, 



Blue, subglobose, in flat-cymes with red stems.. 87. CORNUS ALTERNIFOLIA. 

 Bright-red, elongated, sessile upon an orange -colored disk. 



88. CORNUS FLORIDA. 



cP. Distinct, (not inclosed in a common stone.) 

 e. Crowned with the persistent calyx-teeth. 



Purple black, 5-seeded, in umbels 8. ARALIA SPINOSA. 



Red or purplish, 4-8- seeded, axillary 52. ILEX OPACA. 



e 2 . Not crowned with calyx-teeth but scaly-bracted beneath, 2-5 seeded, 



bluish-black .24. JUNIPERUS VIRGINIANUS. 



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

 d. Ovoid oblong or ellipsoidal, surrounded at its base with an involucral cup 



(Quercus), acorn borne. 



e. On the new wood of the season (subgenus Leucdbalanus), cup 

 f t About J- enveloping the small, ovoid nut ; scales thin and appressed. 



68. Q. MUHLENBERGII. 



f*t About enveloping the nut 



Thick, scales very roughly tubercled, edge of cup rather inturned 



after shedding the nut ; nut usually long-ovoid 38. Q. ALBA. 



Thinner, edges flaring out after shedding the nut, scales thinnish ; 



peduncles shorter than petioles 67. Q. PRINUS. 



f*. About \ or more enveloping the nut ; peduncles 



g. Longer than the petioles, scales loosely appressed. . . 66. Q. BICOLOR. 

 gt Shorter than the petioles ; scales very loosely appressed forming a 



moss-like fringed margin of cup 39. Q. MACROCARPA. 



More closely appressed and not forming a moss-like fringe. 



92. Q. OBTUSILOBA. 



C 2 . On wood of the preceding season (subgenus Melanobalanus}; cup. 

 ft Saucer-shaped, very shallow, enveloping the large, broad, ovoid- 

 oblong nut (about 1 in. long) 15. Q. RUBRA. 



Small, depressed globular nut (^ in. or less long). .94. Q. PALUSTRIS. 

 /*. Top-shaped, enveloping the acorn ; scales thin and coarse 



Inner bark of tree reddish 69. Q. COCCINEA. 



Inner bark yellowish 93. Q. TINCTORIA. 



d?t Club-shaped, short, surrounded with stiff hairs, tipped with the persistent 

 recurved style and arranged in globular heads. 



13. PLATANUS OCCIDENTALS. 

 d?. Acheniuin-like, small and borne in short catkins. 



Inclosed in a membranous inflated sac, catkin hop-like. 



41. OSTRYA VlRGlNICA. 



Subtended by an enlarged leafy bract 42. CARPINUS CAROLINIANA 



C 6 . Nut-like, but not invested with an involucre, globose, about as large as peas 

 and arranged in cymes with a large, leaf-like bract attached to each pe- 

 duncle (Tilia) 3. T. AMERICANA. 



C 6 . Pod (legume) which is 



Oblong, flat, about 2 in. broad and curved. 



27 GYMNOCLADUS CANADENSIS. 

 Linear, twisted and contorted, about 1 in. broad. 



28. GLEDITSCHIA TRIACANTHOS. 

 C 1 . Porno: capsules 

 ft. Cartilaginous; 



