8 
NEW SYLVA 
pies, Larch &c, 2. Early leaves of short dura- 
tion as in Pavias, Prunus &c. 3. Late leaves 
of long duration, as in Ash trees, Oaks, Ches- 
nuts <$*c, 4. Late leaves of short duration, as in 
Catalpa, Liriodendron &c ; but the exact times 
vary by 2 months from Canada to Florida, and 
in Florida many deciduous trees become nearly 
evergreens 
The floration is either early or late vernal as 
in most species, before the leaves or with them 
Early or Late estival ; but few are serotine or 
autumnal as Hamamelis. The few hyemal 
trees may be deemed very early vernal. The 
duration of these flowers is seldom larger than 
half a lunation, some only last a week or a 
few days; whence they must be watched. Se- 
mination is more lasting, as seeds succeed the 
flowers, and are often a long while ripening ; 
in some they even last on the trees and shrubs 
over the Winter. 
The majority of our Northern trees and 
shrubs belong to the Amentaceous tribe, the 
Conifers, Rosacea and Senticose, Pomacea, 
Bicornes, Viburnides, Hederacea &,c. As we 
advance South; we meet a great variety of 
Rhamnides,Fraxinides, Magnolides, Ribesides, 
Akerides, Vitides, Ulmides, Cistides, Araliacea, 
Terebinthides, Lonicerides &c, while when we 
reach Florida and Texas, several other natural 
families appear, the Rubiacea, Cactides, Lau- 
rinia, Eleagnides. with the palms and yucas of 
the Endogenous series. There also gradually 
appear the fruticose Malvacea, Leguminose, 
Saxifragides, Labiate, Hypericina #c which 
are either unknown or rare towards the north 
or even the middle regions of North America. 
Few kinds of trees and shrubs are found in 
