PEA FAMILY 511 



the leaves, 1-2-flowered; calyx 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. Nels. Desert regions: Wyo. 

 Submont. My-Jl. 



3. H. simplicifolius (Nutt.) Rydb. Leaves linear-oblanceolate, 5-10 mm. 

 long, canescent-strigose; peduncles very short, 1-2-flowered; calyx strigose; 

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

 with purple; pod glabrate, slightly longer than the calyx. A. simplicifolius 

 Nutt. Dry hills: Wyo. Ida. Submont. Je-Jl. 



4. H. uniflorus Rydb. Leaves oblanceolate or linear-spatulate, appressed 

 silky-canescent, 1-2 cm. long, 1-3 mm. wide; peduncles 1-2 cm. long; calyx 

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

 corolla 8 mm. long. Dry hillsides: Wyo. Plain Submont. My. 



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

 either simple, linear-oblanceolate, or some of them with 3-5, linear-oblanceolate 

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

 tube 2 mm. long; teeth of about the same length; corolla about 8 mm. long; pod 

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

 A. spatulatus Sheld. Dry hills and plains: Sask. Neb. Colo. Utah Mont. 

 Plain Submont. My-Je. 



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

 silky-canescent; peduncles 2-4 cm. long; racemes short, 2-7-flowered; calyx 

 silky-strigose; tube 2 mm. long; teeth subulate, almost as long; corolla 7-8 mm. 

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

 Wyo. Utah. Submont. My-Je. 



7. H. detritalis (M. E. Jones) Rydb. Cespitose perennial, growing in 

 small 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 earlier leaves oblanceolate, 6-8 mm. long; 

 flowers few; calyx-tube 4 mm. long, acute at the base; teeth subulate; corolla 

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

 with brown spots. A. detritalis M. E. Jones. Clayey slopes: Utah. Son. 



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

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

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

 produced; racemes elongate, many-flowered; calyx sparingly short-hairy; tube 

 3 mm. long; teeth triangular-subulate, 1 mm. long; corolla 8 mm. long, white, 

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

 ends, glabrous. ,A. lancelarius A. Gray. Dry places: Utah Ariz. (? Colo.) 

 Son. 



9. H. vexilliflexus (Sheld.) Rydb. Stems strigose-canescent, decumbent, 

 branched, 1-3 dm. high; leaflets 7-11, strigose-canescent, oblong or oblanceolate, 

 acute, 5-18 mm. long; calyx strigose; tube 1.5 mm. long; teeth subulate, 1.5 mm. 

 long; corolla purplish, 6-8 mm. long; pod oblong, strigose, abruptly acute, 8 

 mm. long, 3 mm. wide. A. pauciflorus Hook. A. vexilliflexus Sheld. Hills 

 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 elliptic, obtuse, sparingly strigose below, glabrate 

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

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

 miser 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; calyx-teeth narrow, shorter than the tube; 

 corolla white or pale rose-colored, 6 mm. long; pod 1 cm. long, transversely 

 rugose, glabrous. A. grallator S. Wats. River banks: Colo. Submont. Jl. 



