344 Part III. Chapter 5. 
Engler’s Classification. 
I. Arktisches Amerika. 
I. Subarktisches Nordamerika. 
a) Alaska-Bezirk, b) Peace- und Athabasca-River-Bezirk, c) Hudsonbay - Bezirk, 
d) Labrador-Bezirk. 
II. Gebiet des Atlantischen Nordamerika, 
I. Seenprovinz: A) Zone der Pinus strobus, B) Östliche Übergangszone der sommer- 
grünen Laubwälder. 
2. Provinz des sommergrünen Mississippi- und Alleghany-Waldes: A) Mississippi-Ohio- 
Tennessee-Zone, B) Alleghany-Zone, Zone der Pine barrens und des Strandes. 
3. Immergrüne Provinz der südatlantischen Staaten: A) Küstenzone der Sumpfkiefer, 
} Zone des Mischwaldes, C) Prairie-Wald-Zone, D) Südliche Kiefernwald-Zone. 
4. Prairieen-Provinz: A) Nördliche Zone, a. Prairie- Gras- Formationen, 8. Sandhügel- 
Formationen, y. Formationen der Vorhügel, B) Mittlere Zone, C) Südliche Zone, 
Übergang zur Chaparal- und Sonora-Provinz des centralamerikanischen Xerophyten- 
gebietes. 
IV. Gebiet des pacifischen Nordamerika. 
ı. Provinz der pacifischen Coniferen: A) Nördliche Zone, Bezirk des nördlichen Küsten- 
waldes und Bezirk eiskaskadischen Waldes und des Kaskadengebirges. 
B) Südliche Zone, Bezirk des Kalifornischen Küstenwaldes und Bezirk des west- 
lichen Nevadawaldes und der Sierra Nevada. 
2. Provinz der Rocky Mountains: A) Nördliche Zone, B) Südliche Zone, mit Übergang 
zur Chaparal- und Sonora-Provinz. 
3. Westliche Prairieen-, Wüsten- und Salzsteppen-Provinz: A) Übergang von der Cha- 
paral und Sonora-Provinz mit der Mojave- und Gila-Wüste, B) Zone des Great-Basin, 
C) Innere Kalifornische Zone, 
The classification of the phyto-geographic zones, zone-sections and regions 
of North America by the writer is presented in the colored map. The plants 
which are peculiar to the different divisions, and which enable the botanist to 
distinguish the different phyto-geographic districts will be given in the Part IV. 
of this book. The classification presented herewith represents the writer be- 
lieves the present state of our knowledge concerning the geographic distribution 
of American plants. In it is incorporated, all that is good in the classifications 
which have preceded without sacrificing originality. The endeavor has been 
to observe the law of priority by using the oldest name, except when the 
region to which the name has been applied, has not been found identic in the 
new and the old classifications. The author has felt himself free to apply a 
new name, when such a difference of territorial location has been discovered 
to exist. — In the construction of the map which accompanies this work, the 
‚excellent map of Merriam was first sketched in color upon the outline mother 
map of North America. The distribution of the principal forest trees was then 
depicted by a variety of character lines upon the colored face of the chart. 
After a study of the general character of the North American flora, such 
well known botanic regions, as the prairie region, the tundra region, the region 
of the great interior basin, the Rocky Mountain. region, etc. were outlined 
upon the.map, particular attention being paid to the physiographic divisions, etc- 
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