Page:Plant indicators the relation of plant communities to process and practice.djvu/13

CONTENTS.

VII

IV. Climax formations of Western North America-Continued.

Bulbilis-Bouteloua Association

 * Nature 139


 * Range 140


 * Grouping of dominants 141


 * Factor relations 142


 * Sequence of dominants 142

Societies

 * Prevernal societies 143


 * Vernal societies 143


 * Estival societies 143


 * Serotinal societies 144

Clans

 * Prevernal clans 144


 * Vernal clans 144


 * Estival clans 144


 * Serotinal clans 144

Aristida-Bouteloua Association

 * Nature 144


 * Range 145


 * Rank of dominants 146


 * Grouping of dominants 146


 * Sequence of dominants 147

Societies

 * Vernal societies 148


 * Estival societies 148


 * Serotinal societies 149

Agropyrum-Stipa Association

 * Nature 149


 * Range 149


 * Factor relations and sequence 151

Societies

 * Prevernal societies 152


 * Vernal societies 152


 * Estival societies 152


 * Serotinal societies 152

Clans

 * Prevernal clans 152


 * Vernal clans 152


 * Estival clans 152


 * Serotinal clans 152

Atriplex-Artemisia Formation

 * Nature 152


 * Unity of the formation 153


 * Range 154


 * Subclimax sagebrush 155


 * Associations 156

Atriplex-Artemisia Association

 * Range 156


 * Rank and grouping 157


 * Correlations 158


 * Successional sequence 159

Societies

 * Grass communities appearing as societies 160


 * Vernal societies 160


 * Estival societies 160


 * Serotinal societies 160

Salvia-Artemisia Association

 * Range 160

Larrea-Prosopis Formation

 * Nature 162


 * Range 163


 * Unity of the formation 163


 * Structure of the formation 165

Summary of Dominants

 * Associations 166


 * Relation to other formations 167

Larrea-Flourensia Association

 * Correlations and sequence 168

Larrea-Franseria Association

 * Nature 170


 * Extent 171


 * Structure 172


 * Groupings 172


 * Factor relations 173


 * Successional relations 174


 * Root relations 176

Quercus-Ceanothus Formation

 * Nature 177


 * Unity of the chaparral formation 178


 * Climatic relations 178


 * Origin and succession 179


 * Range and extent 180


 * Structure of the formation 181


 * Grouping of dominants 181


 * Associations 183

Cercocarpus-Quercus Assoeiaiion

 * Nature and extent 183


 * Contacts 184


 * Groupings 185


 * Equivalence of dominants 186