Trees of the Northern United States 137 



78. Fruiting pedicel much thickened below the prominent 

 calyx base, red;- drupe oblong-globose, blue. 



Sassafras. (16). 



78. Fruiting pedicel somewhat thickened, red or reddish, 

 the drupe-like berry dark blue, l-l in. in diam- 

 eter. Persea. (15). 



78 Fruiting pedicel not thickened below the calyx or if so 

 the fruit not blue. 74. 



74. Fruit light greenish-yellow ; flesh with a sickenyig- 

 sweet odor and a sticky juice; embryo in a large 

 kernel; a gymnospermous seed. Gir^kgo. (1). 



74. Drupe often large and sweet, sfccne wath a suture all 

 around, often flattened. Prunus. (27). 



74. Drupe with a 4-6 lobed calyx ; oblong-ovate, blue ; 

 endosperm large with a small embryo in the cen- 

 ter. Chionanthus. (78). 



74. Fruit really a small black berry : seed shining, with 



the hilum at the base. Bumelia. (6!)). 



75. Stone with 2 cavities and 2 seeds. 76. 



75. Stone usually with 1 seed. 77. ' 



76. Drupe white or blue. Cornus. (79). 



76. Drupe red. Cynoxylon. (80). 



77. Stone w-ith 1 cavity and 1 seed, grooved and some- 



what compressed; drupe glabrous, blue or nearly 

 black. Nyssa. (81). 



77. Fruit with prominent nerves and ridges, w^th 5 

 sepal-tips, oblong-ovate, pubescent, nearly dry. nut- 

 like. Symplocos. (71). 



77. Stone 1-seeded. sometimes flattened : drupe with a prom- 

 inent stylar beak, blue, black, or red. 



Viburnum (83) 



