50 RyDBERG: Rocky MOUNTAIN FLORA 
the calyx-teeth are triangular, about as broad as long. All three 
species have rootstocks, or a deep-set root and the stems branching 
below ground, the corollas are ochroleucous, the keel curved from 
near the base and without any purple. What Dr. Gray and many 
later writers regarded as Astragalus campestris is a combination of 
several species characterized by a cespitose caudex or strongly- 
branched rootstocks, white, pink- or purple-tinged corollas, and 
the keel curved only at the tip and with a dark-purple tip. The 
aggregate consists of Homalobus decurrens Rydb., H. hylophilus 
Rydb., H. tenuifolius Nutt., H. divergens Blankinship (7. camporum 
Rydb.), and other species. 
The range of 4. campestris seems to be limited to Wyoming, 
northern Colorado and northeastern Utah. 
Homalobus oblongifolius v 
Homolobus hylophilus Rydb. Bull. Agr. Exp. Sta. Colo. 100: 210, 
in part. 1906, 
Perennial with a cespitose caudex ; stems ascending, branched, 
2-3 dm. high, glabrous or nearly so; stipules ovate, scarious, 4-5 
mm. long; leaves 8-10 cm. long ; leaflets 11-19, usually oblong, 
but varying from elliptic to linear-oblong, 1-2 cm. long, 3-6 mm. 
wide, glabrous above, sparingly strigose beneath, rounded at the 
apex; peduncles 5-10 cm. long; raceme short, 3-5 cm. long, 
5-10-flowered ; bracts lanceolate, scarious, 1 mm. long; calyx 
strigose with black hairs; tube campanulate, 2-2.5 mm. long; 
teeth subulate, fully 1 mm. long; corolla 1 cm. long, white, tinged 
with purple ; keel with a narrow dark-purple tip; legumes 22.5 
cm. long, strigose, 4 mm. wide ; the lower suture strongly curved, 
the upper straight or slightly upturned towards the apex. 
This species was included in H. hylophilus in my Flora of 
Colorado, ?. €., as far as the Colorado specimens are concerned. 
It resembles H. hylophilus, but the leaflets are thicker and the pod 
decidedly strigose and of another shape. In H. hylophilus the 
legume is straight and glabrousfrom the beginning. WH. oblongifolius 
is found as far as known only in the mountains of Colorado, while. 
H, hylophilus belongs to Montana, northern Wyoming and Idaho. 
Cororapo : Cerro Summit, 1901, Baker gog (type) ; Leadville, 
1884, M. £. Jones ; North Park, near Teller, 1884, CS. Sheldon 
108 ; Marshall Pass, WZ. E. Jones. 
New York BOTANICAL GARDEN, © 
