208 
FABACEAE. 
2. Diholcos decalvans (Gandoger) Rydb. (A. bisulcatus decalvans Gan- 
doger) River valleys of Colo.—Alt. about 5000 ft.—New Windsor, Weld 
Co.; Ft. Collins; Dixon Canon; Quimby. 
3. Diholcos Haydenianus (A. Gray) Rydb. ( A . Haydenianus A. Gray) 
In the mountains of Wyo. and Colo.—Alt. about 7000 ft.—Rio Blanco, south 
of Pagosa; Mancos; Pagosa Springs; Montrose; La Veta; Gunnison; 
Ridgeway. 
23. KENTROPHYTA Nutt. 
Stipules united only at the base, more or less herbaceous. 
Plants 3-4 dm. high, usually erect; stipules with long spinulose tips. 
2. K. hnpensa. 
Plant low; stipules not spinulose-tipped. 3. K. viridis. 
Stipules united for about half their length, scarious. 
Corolla ochroleucous, about 4 mm. long; leaflets less than 5 mm. long. 
4. K. Wolfit. 
Corolla purple, about 6 mm. long; leaflets over 5 mm. long. 5. K. aculeata. 
1. Kentrophyta impensa (Sheldon) Rydb. ( Astragalus viridis impensus 
Sheldon; A. Kentrophyta elatus S. Wats.) In canons and bad-lands from 
Colo, to Nev. and Ariz.—Grand River Canon. 
2. Kentrophyta viridis Nutt. ( Astragalus Kentrophyta A. Gray, in part.) 
In canons and bad-lands of Wyo. and Colo.—Palisades. 
3. Kentrophyta Wolfii Rydb. ( Homalobus Wolfii Rydb.) On dry hills of 
Colo.—South Park. 
4. Kentrophyta aculeata (A. Nels.) Rydb. (A. tegetarius implexus Canby; 
A. aculeatus A. Nels.) On dry hills and mountains from Mont, to Colo, and 
Utah.—Alt. 8000-10,000 ft.—Chambers’ Lake; Georgetown. 
24. HOMALOBUS Nutt. 
Leaves simple or some rarely pinnately 3-foliolate; plants pulvinate-cespitose. 
SlMPLICIFOLII. 
Leaves pinnately 5-many-foliolate. 
Pods sessile or short-stipitate; stipe seldom exceeding the calyx. 
Pods more or less compressed. 
Pods oval, ovate, broadly oblong or elliptical 
Pods linear, 1.5 cm. or more long. 
Pods terete or nearly so. 
Pods long-stipitate; stipe many times as long as the calyx. 
Tenelli. 
Campestres. 
Flexuosi. 
Macrocarpi. 
SlMPLICIFOLII. 
One species. 
Tenelli. 
Pods strictly sessile. 
Pods erect on long pedicels. 
Pods spreading or reflexed on short pedicels. 
Pods glabrous; plant canescent. 
Pods hairy ; plant green. 
Pods short-stipitate. 
Leaflets broadly linear or oblong; corolla ochroleucous. 
Leaflets narrowly linear; corolla whitish, tinged with purple. 
1. H. caespitosus. 
2. A. grallator. 
3. H. Wingatanus. 
4. H. Clementis. 
5. H. tenellus. 
6. H. acerbus. 
Campestres. 
Calyx-teeth lanceolate to subulate, half as long as the tube or longer. 
Pods arcuate. 7. H. dectanbens. 
Pods straight. 
