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THE AMERICAN NATURALIST [Vol. LV 



form can not be secured, inasmuch as the somatic varia- 

 tions involved appear to be more profound and com- 

 plicated than in any of those so far studied. 



The only other form variations, aside from mere size, 

 so far observed are two modifications of the banner. In 

 one plant of nanus in 1919 the banner was hooded in the 

 fashion of some varieties of sweet peas. This same varia- 

 tion had been previously noted in apricus in 1914. Apri- 

 cus also occasionally yields plants with the abbreviated 

 banner characteristic of pipersmithii. So far seeds of 

 neither of these variations have been collected, though 

 attempts have been made. 



The table below summarizes the variations observed in 

 1919. This season's study yielded no new types and 

 failed of some of those found tlie year before. 



The variations in size of all three species are very con- 

 siderable, no doubt due in large part in the field to differ- 

 ences of soil, moisture, shade and exposure. When 

 grown in the garden side by side nanus is the largest and 

 most vigorous and pipersmithii the smallest. In the 

 field nanus is often smaller than apricus, though the 

 flower cluster is usually much larger. This difference is 

 possibly due to the fact that it grows in more open, ex- 



