264 University of California PxiblicaUons in Botany [Vol. 6 



minor morphological characters as associated with certain definite 

 and peculiar histological characters as criteria for the separation of 

 the different species and forms. 



I desire to express here my thanks and appreciation to Professor 

 W. A. Setchell, to whom I am indebted for many helpful suggestions 

 made from time to time during the progress of this investigation. He 

 has most freely given me of his time and the benefit of his mature 

 judgment in the preparation of material and as to the value of certain 

 of the histological characters discussed in this paper. 



Transmitted April 16, 1915. 



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