VOL. XV, PP. 183-186 AUGUST 6, 1902 



PROCEEDINGS 



/ 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



THE GENUS HEDYSARUM IN THE ROCKY 



MOUNTAINS. 



/ 



BY AVEN NELSON. 



Most of the material that has been collected in the genus 

 lledysarum in the Rocky Mountain Region has found its way into 

 the herbaria either as H. boreale or II. Mackenzii. More recently 

 some of it is appearing under other names. Of the numerous 

 collections made by the writer some have been distributed under 

 the foregoing names, but always with the feeling that a careful 

 study of ample material would show that material so distributed 

 usually represented an aggregate. For the sake of light on 

 this point careful study of the literature and the specimens at 

 hand has been made with the following conclusions respecting 

 all the species heretofore attributed to this region. 



Hedysarum Americanum (Michx.) Britt. 



lledysarum alpinum Americanum Michx. Fl. 2:74; Pursh, Fl. 2:484. //. 

 boreale Nutt. in D. C. Prodr. 2:343, in part; Hook. Fl. Bor. Am. 1:155, in 

 part; and later authors in part. Not //. boreale Nutt. Gen. 2:110. 



It does not seem to me that there is sufficient evidence to show that the 

 plants of Michaux "In borealibus Canadae et in cataractis montium Al- 

 le^hanis" and those of Nuttall "In arid and denudated soils around 

 Fort Mandan on the banks of the Missouri" are the same species. In 



36-BIOL. SOC. WASH. VOL. XV, 1902. (183) 



