500 FABACEAE 



equal, subulate; corolla 15-18 mm. long; stipe of the pod about 5 mm. long; body 

 12-lG mm. long, 5 mm. wide. Astragalus bisulcatus decalvans Gand. Plains 

 and foot-hills: Colo. — Wyo. Submont. Je. 



2. D. bisulcatus (Hook.) Rydb. Stems erect or decumbent at the base, 

 sparingly strigose or glabrate, 3-7 dm. high; leaflets 17-27, ellijitic or rarely oval, 

 1-2.5 cm. long; racemes many-flowered; calyx strigose, tinged with purple; tube 

 4 mm. long; teeth subulate or lance-subulate, the upper 1.5-2 mm. long, the 

 lower 2-3 mm.; corolla 12-15 mm. long; legimie strigose. A. bisulcatus A. Gray. 

 Plains, hills, and river valleys: Sask. — Neb. — Colo. — Alta. Plain — Submont. 

 Je-Au. 



3. D. scobinatulus (Sheld.) Rydb. Stems 3-6 dm. high, erect; leaflets 

 15-21, elliptic or oblong or oval, 8-20 mm. long, ol)tuse; raceme rather short; 

 calyx sparingly strigose; tube 4 mm. long; upper teeth triangular-subulate, 1-1.5 

 mm. long; lower subxdate, about 2 mm. long; corolla fully 1 cm. long, cream- 

 colored; keel purple-tipped. A. Haijdenianus major Jones. A. scobinatulus Sheld. 

 A. Haijdenianus Nelsonii Gand. Alkali flats and dry ground: Utah — Wyo. 

 Plain. Je. 



4. D, Haydenianus (A. Gray) Rydb. Stems erect, 3-9 dm. high; leaflets 

 15-29, linear to elliptic, 7-20 mm. long; racemes elongate; c&lyx strigose, 

 usually with black hairs; tube 3-4 mm. long; upper teeth triangular-subulate, 

 1 mm. long, the lower subulate, 1.5-2 mm. long; corolla 7-9 mm. long. A. 

 Haydenianus A. Gray. Dry soil: Colo. — Wyo. — Utah. Sub/nont. Je-Jl. 



5. D. micranthus Rydb. Stems erect or ascending, sparingly strigose or 

 glabrate, 2-4 dm. high; leaflets 17-25, linear or lance-oblong, acute at both ends, 

 7-20 mm. long; racemes many-flowered; calyx strigose; tube 2-2.5 mm. long; 

 teeth subulate-filiform, 1-2 mm. long, the upper somewhat shorter; corolla 6-7 

 mm. long, ochroleucous; stipe 3-4 mm. long; body scarcely 1 cm. long, very 

 acute. Dry table lands: Colo. Subinont. My-Jl. 



26. JONESIELLA Rydb. 



Stout perennial, with a woody root and simple stems. Leaves unifoliolate, 

 thick and veinj^; stipules broadly triangular, thin. Racemes 6-8-flowered, 

 axillary. Calyx cylindric, somewhat gibbous, with triangular teeth. Corolla 

 ochroleucous, with a purple spot on the keel. Pod stipitate, coriaceous, elliptic, 

 turgid, partially 2-celled by the inflexion of the upper suture. 



1. J. asclepiadoides (M. E. Jones) Rydb. Stems 4-6 dm. high, erect or 

 ascending, glabrous and glaucous; leaves orbicular-ovate or cordate, entire, 

 veiny, thick, 3-5 cm. in diameter; raceme 6-8-flowered; calyx about 1 cm. long; 

 corolla 2 cm. long; pod glabrous; stipe about 1 cm. long; body ovoid, 2.5 cm. 

 long, fully 1 cm. wide. Astragalus asclepiadoides M. E. Jones. Sand-bars: 

 Utah — Colo. Son. Je. 



27. RYDBERGIELLA Fedde & Sydow. 



Stout erect glabrous perennials, more or less branched at the woody base. 

 Leaves pinnate, with numerous leaflets; stipules ovate, almost free. Racemes 

 rather many-flowered; flowers nearly sessile; bracts lanceolate. Calj'x cam- 

 panulate; lobes lanceolate-subulate, nearly equalhng the tube, at last with spread- 

 ing tips. Corolla ochroleucous, with purple-tipped keel; banner and wings nar- 

 row. Pod oblong-ovate, coriaceous, somewhat inflated, with a more or less 

 distinct partial partition formed bj^ the inflexion of the upper suture, more or 

 less stipitate. [Phacopsis Rydb.] 



Pod with a broad partition, almost 2-celled, except at the apex. 1. R. scaphoides. 

 Pod with a narrow, sometimes obsolete partial partition. 

 Stipe of the pod 4-S mm. long. 



Leaflets oblanceolate or oblong. 2. R. arcta. 



Leaflets obovate. 3. R. Preussii. 

 Stipe of the pod 1-2 mm. long; leaflets oblong to oval. 



Plant glabrous; leaflets oblong, retu.se. 4. R. praelonga. 

 Plant hispidulous-strigose on the upper parts of the stem and the lower surface 



of the leaves. 5. R. Pattersonii. 



