76 



Guayule. 



its proportionate size. It flowered freely and produced fully 2000 seeds 

 (exp. 139a; plates 18 to 20). The time occupied in its growth was about 

 four months. 



We may now offer data (table 27) derived by field observation during 

 the growing season of 1908, which was a favorable year, though not per- 

 haps exceptionally so. The rate of growth during germination is indi- 

 cated by the measurements of seedlings from Station 3, collected July 

 15, 1908. They were two to three weeks old. 



Table 27. Rate of growth during period of germination. 



Table 28 contains data based upon the individual examination of 1 1 2 

 seedlings collected in the field on the dates mentioned. The measure- 

 ments are exclusive of the hypocotyl, which measures about 10 mm. on 

 the average. 



Table 28. Amount of growth of seedlings in the first season of growth. 



The seedlings in table 28 were not selected, but were, in each 

 case, all the seedlings found in a given area. Taking those collected in 

 September which, judging by the behavior of guayule plants in gen- 

 eral, was near the close of the growing-season we have an average rate 





