LI«RaRY 

 NEW YORK 

 BOTANICAL 



HARDEN 



Notes on Fabaceae — II 



Per Axel Rydberg 



HOMALOBUS Nutt. (con.) 



D. Campestres 



This group differs from the Tenelli not only in the narrow- 

 strictly sessile pod but in the acute keel-petals, a character which 

 as far as I know separates it from all the other groups of 

 Homalobus. 



21. Homalobus campestris Nutt. This was described 

 from specimens collected on the "Colorado of the West," mean- 

 ing some of the tributaries of the Green River. One specimen 

 of Nuttall's is in the Torrey Herbarium and is in flower. The 

 calyx is 5 mm. long, more or less black-hairy; the lobes are 

 subulate, decidedly longer than broad; nearly every leaf has one 

 or two pairs of lateral leaflets, and the terminal leaflet is repre- 

 sented by the flattened, somewhat falcate prolongation of the 

 rachis. The corolla is evidently ochroleucous, without a trace 

 of purple. Gray, in transferring this species to Astragalus, 

 evidently confused it with some other member of the group, 

 describing the leaves as having often nine to thirteen leaflets and 

 the corolla as being yellowish white, usually tinged with purple. 

 He also regarded II. tenuifolius Nutt. as a depauperate form 

 and evidently had in mind II. hylophilus Rydb., II. oblongifolius 

 Rydb. and their allies. As Astragalus campestris was preoc- 

 cupied, Greene substituted the name A. convallarius . Jones at 

 first made the plant A. serotinus campestris * but cited under this 

 name specimens belonging to other species, one of them, 601511, 



*Proc. Calif. Acad. II. 5: 668. 1895. 



[The Bulletin for July (50: 231-260 pi. 13, 14) was issued July 27, 1923.] 



261 



