Plant Photosynthesis (Net CO2 Exchange Rate) Responses
to Atmospheric CO2 Enrichment

Y
   300 ppm   600 ppm   900 ppm 
Plant Name  Number of
Studies 		  Arithmetic
Mean 		  Standard
Error 		  Number of
Studies 		  Arithmetic
Mean 		  Standard
Error 		  Number of
Studies 		  Arithmetic
Mean 		  Standard
Error 
Yarrow [Achillea millefolium L.] 430.8%12.9% 162%0%    
Yellow Pitaya [Selenicereus megalanthus]     1125%0%    
Yellowtops, Clustered [Flaveria trinervia (Spreng.) C. Mohr] 430.8%12.9% 162%0%    
Yellowtops [Flaveria pringlei Gandoger] 430.8%12.9% 162%0%    
Yellowtops, Florida [Flaveria floridana J.R. Johnston] 430.8%12.9% 162%0%    

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