Vol. XV, pp. 183 186 August 6, 1902 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



THE GENUS IIEDYSARUM IN THE ROCKY 

 MOUNTAINS. 



BY AVEN NELSON. 



Most of the material that has been collected in the genus 

 Jf^'ih/sdfxni in the Rocky Mountain Region has found its way into 

 the herbaria either as 11. horeale or //. Maclxenzii . 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 stixdy of the literature and the specimens at 

 hand has been made with the following conclusions res]>ecting 

 all the species heretofore attributed to tlys region. 



Hedysarum Americanuni (Michx.) Britt. 



- Iledymriim alpinvm Americanum Michx. Fl. 2:74; Pursli, Fl. 2:484. H. 

 horeale 'Nuii. in D. C. Prodr. 2:343, in part; Hook. Fl. Bor. Am. 1:155, in 

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



It does not seem to me that there is suflicient 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) 



