Vol. 50 No. 8 
BULLETIN 
OF THE 
~TORREY BOTANICAL CLUB 
AUGUST, 1923 
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 H. tenuifolius Nutt. as a depauperate form 
and evidently had in mind H. hylophilus Rydb., H. 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, 6015n, 
* Proc. Calif. Acad. II. 5: 668. 1895. 
[The Butetin for July (50: 231-260. pl. 13, 14) was issued July 27, 1923-] 
261 
