

A revision of the genus Milella etc. 397 









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ding variations of M, trifida and is nearly as polymorphous. It ranges from 

 northern to southern Idaho and by successive degrees in reduction of the 

 flower parts, it becomes in northern Utah, in Wyoming and Colorado the 

 var. stenopetala. 



M. divefi'sifolia stands somewhat apart both in its curious leaves and 

 petals but connects undoubtedly with M. trifida stock. It seems to have 

 diverged from the Cascade Mountain branch of M, trifida in compara- 

 tively recent times and has spread only from southern Washington to 

 northern California. 





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