THE ORIGIN AND GROWTH OF PLANT COMMUNITIES 



587 



TABLE IX 



A Grading of Nine Stands According to the Means of Propagation of Their Species, 



Showing How They Maintain Their Numbers and What Means of Reproduction 



They Have. Mosses and Hchens do not appear in this table. 



Number Maintenance Reproduction 



of Species Sexual Vegetat. Sexual Non-sex. 



1. Larreetum divaricatae 



Creosote bush flat 

 Southwest Texas 



2. Yuccetum riograndense 



Yucca scrub 



Southwest Texas 



16 



12 



3. Kobresietum myosuroidis 

 Sedge barren 

 Central Baffin 



13 



8 



4. Artemisietum gaspense 

 Artemisia barren 

 Gaspe 



12 



9 



5. Agrostetum canadense 



Redtop-quackgrass meadow 

 Central Quebec 



8. Aceretum saccharophori 

 quercosum 

 Beech-maple forest 

 Central Quebec 



29 



15 



4 



14 



12 



12 



10 



6 



28 



9. Aceretum saccharophori 

 dennstaedtiosum 

 Maple forest (disturbed) 

 Central Quebec 



42 



23 



19 



37 



