( 27S ) 



CONTRIBUTIONS FROM THE SHAW SCHOOL OF BOTANY. 

 Xo. 2. 



M easily einents of the. Triinorphic Floirers of Oxalis 



SUKSDORFII. 

 By W. G. Eliot, Jr. 



The plant now known as O. Sitksdorjii was for a long time 

 thought to be a form of O. coruiailata^ but its trimorphism, 

 together with other characters, constitutes it a distinct species. 

 It is found in the far north-western part of the United States, 

 where it was first collected by Nutall. 



I spent a part of last summer in a locality where I could col- 

 lect the flower, and, at the suggestion and with the help of Prof. 

 Trelease, I have made some notes upon the heterogony of this 

 species. My work, essentially, was the measurement of the styles 

 and two sets of stamens in one hundred specimens picked at ran- 

 dom, and the plotting of curves in order to give a graphic rep- 

 resentation of these measurements. 



Fig. I. — Flower of Oxalis Suksdorft, X2; at the left, a flower with the petals removed, 

 XS; at the right, the same after removal of the calyx, Xj. 



Oxalis S'tksdorfii grows in abundance in the woods and fields 

 about Portland, Oregon, and even in the yards and paiks of the 



