PKA. FAMILY 511 



the leaves, 1-2-flowered ; cah^x sparingly strigose; tube 3—4 mm. long: teeth sub- 

 ulate, 2 mm. long; corolla 15-20 mm. long, whitish, tipped with purple; pod 

 oblong, 12-15 mm. long, mottled. A. exilifolius A..'Se]s. Desert regions: Wyo. 

 Suhmont. My-Jl. 



3. H. sirapliciiolius (Xutt.) Rydb. Leaves Unear-oblanceolate, 5-10 mm. 

 long, canescent-strigose; pedimdes ver\- short, 1-2-flowered; cah"x strigose; 

 tube 3 mm. long: teeth 1 mm. long: corolla ochroleucous, about 8 mm. long, tipped 

 with purple; pod glabrate, slightly longer than the cal3"x. A. simplicifolius 

 Xutt. Dr.' hiUs: Wyo. — Ida. Submont. Je-Jl. 



4. H. vmiflorus R^db. Leaves oblanceolate or linear-spatulate, appressed 

 silby-canescent, 1-2 cm. long, 1-3 mm. wide; peduncles 1-2 cm. long; cah'x 

 silky-canescent : tube 2 mm. long; teeth subulate, of about the same length; 

 coroUa 8 mm. long. Drj- hillsides: Wyo. Plain— -Submord. My. 



5. H. caespitosus Xutt. Leaves 2-5 cm. long, appressed silky-canescent, 

 either simple, hnear-oblanceolate, or some of them ■nith 3-5, Unear-oblanceolate 

 leaflets; peduncles 3-7 cm. long; racemes short, 2-10-flowered ; cah'x strigose; 

 tube 2 mm. long: teeth of about the same length: coroUa about 8 mm. long: pod 

 lance-oblong, about 1 cm. long, acute, finely strigose. A. caespitosus A. Gray. 

 A. spatulabxs Sheld. Dry hills and plains: Sask. — Xeb. — Colo. — L'tah — Mont. 

 Plain^Suhmori t. My-.Je. 



6. H. brachycarpus Xutt. Leaves spatulate or oblanceolate. 1-2 cm. long, 

 silky-canescent; peduncles 2^ cm. long; racemes short, 2-7-flowered; cah'x 

 silk\'-strigose : tube 2 mm. long; teeth subulate, almost as long: coroUa 7-8 mm. 

 long; pod oblong, abruptly acute, about 7 mm. long, strigose. Drj' plains: 

 Wyo. — L'tah. Submont. My-Je. 



7. H. detritalis (M. E. Jones) Rj'db. Cespitose perennial, growing in 

 smaU mats; stems prostrate, 3-5 cm. long, ashy-strigose; leaves basal, 5-7 cm. 

 long: leaflets mostly 5, cinereous-strigose, linear-oblanceolate, about '18 mm. 

 long, aristately-tipped, or those of the earUer leaves oblanceolate, 6-8 mm. long; 

 flowers few; cah'x-tube 4 mm. long, acute at the base; teeth subulate; coroUa 

 purple, 15-16 mm. long; pod arcuate, about 2.5 cm. long, 2 mm. wide, mottled 

 ^"ith brown spots. -4. detritalis M. E. Jones. Claj'ey slopes: L'tah. Son. 



8. H. lancelarius (A. Gray; Rydb. Stems erect, flexuose, branched, gla- 

 brous, 4^5 "im. high; leaflets 5-9, 1-2 cm. long, about 1 mm. wide, cinereous- 

 puberulent, sometimes lacking, especiaUy the terminal one, when the rachis is 

 produced; racemes elongate, many-flowered; cah'x sparingh- short-hairj'; tube 

 3 mm. long; teeth triangular-subxilate, 1 mm. long; coroUa 8 mm. long, white, 

 tipped with purple; legume oblong, 15-20 mm. long, 6 mm. wide, acute at both 

 ends, glabroiis. A. lancelarius A. Gray. Drj' places: L'tah — Ariz. — (? Colo.) 

 Son . 



9. H. vexilliflenis f Sheld.) Rydb. Stems strigose-canescent, decumbent, 

 branched. 1-3 dm. liigh: leaflets 7-11, strigose-canescent, oblong or oblanceolate, 

 acute, 5-18 mm. long; cah'x strigose; tube 1.5 mm. long: teeth subulate, 1.5 mm. 

 long; coroUa purpUsh, 6^8 mm. long; pod oblong, strigose, abruptly acute. 8 

 mm. long, 3 mm. wide. A. pauciflorus Hook. A. vexUliflexus Sheld. HiUs 

 and mountains: Sask. — Wyo. — B.C. Plain — Submont. My-Jl. 



10. H. miser (Dougl.) Rydb. Stems 1-3 dm. high, sparingly strigose; 

 leaflets 11-15, linear-oblong to eUiptic, obtuse, sparingly strigose below, glabrate 

 above, 8-12 mm. long, 2-4 mm. wide; cah'x as in the preceding; corolla purple, 

 about 8 mm. long; pod similar to that of the precedmg, but more acute. A. 

 mvier Dougl. (?) A. amphidoxus Blankinship. Stony banks and hills: w Mont. 

 — Wash. Submont. Jl-Au. 



11. H. grallator (S. Wats.) Rydb. Stem decumbent, about 5 dm. high, 

 glabrous: leaflets about 20, finely strigose or glabrate, 1-2 cm. long, oblong; 

 racemes loose, exceeding the leaves: cah'x-teeth narrow, shorter than the tube; 

 corolla white or pale rose-colored, 6 mm. long: pK)d 1 cm. long, transversely 

 rugose, glabrous. A. graUator S. Wats. River banks: Colo. Suhmont. Jl. 



