LIMIT OF PHYSIOLOGICAL WATER 



57 



The following table gives the limit for several typical plants 

 ranging from amphibious plants to mesophytes of xerophytic 

 tendencies. 



Table of General Variation. 



Potamogeton lonchites. . 

 Echinodorus cordilolius. 



Sagittaria latifolia 



Kanunculus sceleratus.. 



Lobelia syphilitica 



Panicum walteri 



Eclipta alba 



Helianthus annuus 



Ambrosia artemisiifolia. 



Atriplex argentea 



Nasturtium officinale , . . 

 Coleus blumei 



Thus we see that not on'y do plants of different genera 

 vary in their limit but also species of the same genus. 



Some instances of specific variation are given in the fol- 

 lowing table. 



Table of Specific Variation. 



Panicum walteri 



P, proliferum 



P, soribnerianum 



P. crus-galli 



P. virgatum 



Plantago major 



P. rugelii 



P. elongata 



P. purshii 



Rumex crispus 



R. acetosella 



Sporobolus longifolius. 

 S. vaginiflorus 



