t4 SILVA OF NORTH AMERICA. 
fruit of one of them is sometimes used as a conserve. 
properties. 
CORNACELZE. 
The genus is not known to possess other useful 
In America Nyssa is little injured or disfigured by insects,’ and is not seriously affected by fungal 
diseases.” 
Nyssa, the name of a nymph, was bestowed by Linnzus upon the species of the genus which grow 
in water. 
1 Web-worms occasionally disfigure the different species, and 
the caterpillars of Hveryxr cherilus, Cramer, also feed among the 
leaves. The larve of Antispila nyssefoliella, Clemens (Proc. Phil. 
Acad. 1860, 11), and of Nepticula nysseella, Clemens, have been 
observed to mine within the parenchyma of the leaves. In North 
Carolina a Scale-insect, Chionaspis Nysse, Comstock (Rep. U. S. 
Dept. Agric. 1880, 316), has been found on Nyssa. 
2 More than fifty species of fungi have been recorded as living 
upon the species of this genus in the United States, principally on 
Nyssa sylvatica. Most of them are small black species sometimes 
found also on other plants, and none produce marked disease, al- 
though the leaves of young shoots are sometimes somewhat disfig- 
ured by Glenospora Curtisii, Berkeley and Desmaziére. 
SYNOPSIS OF THE NORTH AMERICAN SPECIES. 
Stones of the fruit with more or less distinct low broad rounded ridges. 
Leaves linear-oblong to oval or obovate 
Stones of the fruit with prominent, winged, or acute ridges. 
Leaves oblong-oval or obovate, usually obtuse at the apex . 
Leaves oval or oblong, acute or acuminate 
1. N. SYLVATICA. 
2. N. OGEcHE. 
3. N. AQUATICA. 
