RYDBERG: Rocky MOUNTAIN FLORA 45 
Abajo Mountains, August 11, 9605; 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- 
bridet 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 Hosackia 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. 
AcMIsPpon 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. 1814. Not L. sericeus 
DC. 18%. 
Trigonella americana Nutt. Gen. 2: 120. 1818. 
Hosackia Purshiana Benth. Bot. Reg. under pl. 1257. 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. 
