180 RYDBERG: NOTES ON FABACEAE—I 
coriaceous, sessile, somewhat triquetrous, pointed, scarcely 
longer than the calyx;” ‘‘flowers ochroleucous.”” In Watson’s 
plant the scape is three- to seven flowered, usually as long as, or 
longer than, the leaves; the pod is decidedly flat; and the corolla 
is purple. All the characters given by Nuttall fit A. exilflcrus 
A. Nelson, but I do not think that the two are identical. There 
is, however, a plant of southern Wyoming and northern Colorado 
that agrees fully with Nuttall’s type. This resembles Nelson’s 
species but is smaller and has shorter leaves. In this respect 
it approaches H. brachycarpus, being distinguished from that 
species by its narrower and more pungent leaves and by its 
shorter, unmottled, and rather turgid pod, thicker nearer the 
lower suture than the upper, hence Nuttall’s expression, ‘‘some- 
what triquetrous.”’ Nuttall’s specimen in the Gray Herbarium 
has leaves only, so that Watson had no opportunity to compare 
the pods. The following specimens belong to this species:— 
WyominG: Rocky Mountains, Nuttall; Fremont; Ham’s 
Fork, C. C. Curtis; Green River, Jones; Hanna, Payson & Payson 
1694. 
CoLorapo: Canon City, Brandegee. 
4. HoMALOBUS EXILIFOLIUS (A. Nels.) Rydb. See notes 
under the preceding species. The following specimens belong 
here :— 
Wyominc: Freezeout Hill, Elias Nelson 4493; Fort Steele, 
Tweedy 4194. 
5. HOMALOBUS LINGULATUS (Sheld.) Rydb. This is known 
only from the original collection, and its description is much 
like that of the preceding species, the only essential difference 
being the glabrous calyx. The mature fruit is unknown. When 
the plant is better understood it may prove to be the same as 
H. exilifolius, in which case the species should bear Sheldon’s 
specific name, which antedates Nelson’s by five years. 
6. HOMALOBUS UNIFLORUS Rydb. It is possible that this 
may represent an aberrant form of H. brachycarpus, i.e. Astrag- 
alus simplicifolius, as understood by Watson. The pod, how- 
ever, is different, being lanceolate in outline, more tapering at 
the apex, 6-7 mm. long and 2-3 mm. wide. It is, therefore, 
