VIU Contents, 
Part Third. 
Geologic Evolution, Theoretic Considerations and Statistics of the 
Distribution of North American Plants. 
Chapter I. Cretaceous and Tertiary Floras. 
Beginning of the actual Flora; Evolutionary Principle; Evolution of the Forests; 
The Relict Miocene Flora; Endemisms and Glacial Plants 
Chapter II. History and Development of North American Flora during the 
Glacial Periods. 
1. The Extension of the old Glaciers; 2. The Pleistocene Flora; 3. The 
Glacial Flora; 4. The Flora of the Rocky Mountains and of the Sierra Nevada; 
5. The Vegetation Zones south of the Land Ice. 
Chapter III. Postglacial and Recent History of the North American Flora. 
. Immediate Effects of Glacial Retreat (203—212); 2. Evolution of Coastal 
Southern Mountain Floras (212—226); 3. Southern Atlantic States and 
Mischeippi Valley (226°—239); 4. The Western Mountainous Elements and the 
Great Basin (240—261); 5. Flora of the Pacific Mountain Ranges (261—282); 
6. Western Desert Ranges (2832—300); 7. Non-Desert Floral Elements of Mexico 
and Central America (300—311) 
EEE WR N ER en ... 
Chapter IV. Affinities of North American Flora. 
1. Arctic America (311—314); 2. Plants common to Europe and northeast 
America (315—316); 3. Eastern North America and Eastern Asia (316—317); 
4. Tropie and Subtropie Affinities (317—320); 5. Relationship in Western 
North American Flora (320—324); 6. Relationship of the Floras of Mexico, 
Central America and West Indies (324—331); 7. Southern Extension of North 
American Flora (331—341) . 
EEE IT A EEE EEE NEE BAER 
Chapter V. North American Phytogeographic Classifications. 
GRISEBACH; ENGLER; DRUDE;5 MERRIAM; CLEMENTS. » 2»... 2.22 200 
Part Four. 
North American Phytogeographic Regions, Formations, Associations. 
Chapter I. Arctic and Sub-Arctic Zones. 
. Arctic Regions of Labrador, northern Mackenzie and the Arctic Shore, 
(a) Tundra en (b) Marine Algal Formations; (c) Formations of the 
PibiloE ua 2 see nee rn ehe 
. see Ferait Region of North Canada and Alaska: A. Labrador Distriet; 
. Hudson Bay Distriet; C. Mackenzie Distriet; D. Alaska District. 
i 
107 
Chapter II. North American Temperate Zone: Atlantic Section. 
1. St. Lawrence — Great Lake Region. 
A. Maritime Distriet: (a) New Brunswick Area (361—378), (b) New England 
Area (378—390); B. Lake District: (a) Interlacustrine Area urn 
(b) Adirondack Area (403—408). ...» 2. 2... 
2. Atlantic — Gulf Coastal Region. 
A. Northern Pine Barren-Strand District (409—426); B. Carolinian Pine Barren- 
Strand Distriet (427—443); C. Gulf Pine Barren-Strand Distriet (443—453); 
D. Arkansas-Louisiana Distriet (453—460). e% 
ne RL Se a ae Lem ’ 
Pages 
170— 182 
182—203 
203—311 
346—351 
.. 351—360 
