Rydberg : Rocky Mountain flora 45 



Abajo Mountains, August II, 960$; Hammond Canyon, Elk 

 Mountains, August 10, 9583. 



Lotus tenuis Waldst. & Kit.; Willd. Enum. Hort. Berol. 797. 



1809 



Lotus tenuifolius (L.) Reich. Fl. Germ. 506. 1830. 

 Lotus Macbridei A. Nels. Bot. Gaz. 53: 221. 1912. 



In looking over a collection received in exchange from the 

 University of Wyoming, I found a specimen labeled Lotus Mac- 

 bridei A. Nels. n. sp. To my surprise I found that this was a true 

 Lotus, i. e. not belonging to any of the segregates of Llosackia but 

 of the European type. As it would have been exceedingly strange 

 if a species of Lotus in the restricted sense should be found native 

 in America, I turned to our collection of Old World species of Lotus 

 and found that it is the same as L. tenuifolius (L.) Reich. Before 

 I had time to call Professor Nelson's attention to the fact, his 

 description appeared in the Botanical Gazette. 



Trifolium macrocephalum (Pursh) Piper, T. plumosum Dougl., T. 

 eriocephalum Nutt., T. spinulosum Dougl., and cyathiferum Lindl. 

 have been collected in Idaho; T. Rusbyi Greene and Medicago 

 hispida Gaertner (M. denticulata Willd.) in Montana. 



Acmispon Raf. New Flora 1: 53. 1836 



I think that this genus should be restored. The Microlotus 

 section sometimes referred to Hosackia, sometimes to Lotus, is out 

 of place in either genus, and Acmispon is the oldest available 

 generic name. 



Acmispon americanus (Nutt.) Rydb. 



Lotus sericeus Pursh, Fl. Am. Sept. 489. 18 14. Not L. sericeus 



DC. 1813. 

 Trigonella americana Nutt. Gen. 2: 120. 1818. 

 Hosackia Purshiana Benth. Bot. Reg. under pi. I2$J. 1829. 

 Acmispon sericeum Raf. New Fl. 1: 53. 1836. 

 Lotus americanus Bisch. Del. Sem. Hort. Heidelb. 1839. 

 Trigonella sericea Eat. & Wright, N. Am. Bot. Ed. 8, 459. 1840. 



