Growth in Eriogonum nudum 



229 



The leaves ajre ovate, strongly cutinized above and clothed with a dense 

 white felt beneath. The whole plant is d^istinctly xerophytic in character. 

 The course of transpiration for two days for the plant which bore its 

 leaves is shown in fig. 9. On the first day (July 12th), which was cool 

 and foggy (max. temp. 63) the transpiration followed a course almost 





Jij/y /Z. ir 



Hour 



Figure 9. Growth, transpiration and evaporation. 



identical with that of evaporation, the ratio evaporation to transpiration 

 for the period 6-18 hour being 27 cu. cm. per 100 sq. cm. (cylindrical 

 porous cup) to 4.1 cu. cm. per 100 sq. cm. plant surface, or 6.5 to i. 

 On the following day there was a light and intermittent fog in the 

 morning, gradually becoming brightly sunny at 10 hour. Up to this 



