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 (//. camporum 
Rydb.), and other species. ; 
The range of H. campestris seems to be limited to Wyoming, 
northern Colorado and northeastern Utah. 
Homalobus oblongifolius 
Homolobus hylophilus Rydb. Bull. Agr. Exp. Sta. Colo. 100: 219 
In part. 1906. © 
Perennial with a cespitose caudex ; stems ascending, branched, 
2-3 dm. high, glabrous or nearly so; stipules ovate, scarious, 4-5 
. 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 ao 
cm. long, strigose, 4 mm. wide ; the lower suture strongly curvee, 
the upper straight or slightly upturned towards the apex. P 
This species was included in H. hylophilus in my Flora ‘ 
Colorado, 7. ¢., as far as the Colorado specimens are concerned. 
It resembles 1. hylophilus, but the leaflets are thicker and the ae 
decidedly strigose and of another shape. In H. hylophilus 
legume is straight and glak from the beginning. H. oblongyf 
is found as far as known only in the mountains of Colorado, W : 
H. hylophilus belongs to Montana, northern Wyoming and pew’ 
Cotorapo : Cerro Summit, 1901, Baker go (type); pets: 
1884, M. E. Jones; North Park, near Teller, 1884, C- S. She 
z08 ; Marshall Pass, M. E. Jones. 
New York BoranicaL GARDEN. 
