PEA FAMILY 513 



hairs; tube about 3 mm. long; teeth 1-2 mm. long, subulate; corolla 8-10 mm. 

 long, dark purple; pod lance-oblong, slightly stipitate, about 15 mm. long, black- 

 hairy, with a round ridge on each side. A. Bourgovii. A. Gray. Mountains' 

 Alta.S.D. Mont. B.C. Submont.Mont. Jl-Au. 



22. H. campestris Nutt. Stems often single, 2-4 dm. high, branched; 

 rachis of the leaves 5-10 cm. long, sometimes broadened at the end into a narrowly 

 oblanceolate blade, but usually long-attenuate; lateral leaflets of the lower leaves 

 narrowly linear or linear-subulate, 5-30 mm. long, those of the upper leaves 

 usually lacking; raceme lax, 3-10-flowered; calyx-tube 3 mm. long; teeth 1 mm. 

 long; corolla about 1 cm. long; pod about 3 cm. long, 3-4 mm. wide, strigose. 

 A. campestris A. Gray. A. convallarius Greene. Sandy plains and bench-land: 

 Wyo. Colo. Utah. Plain Submont. Je. 



23. H. junciformis (A. Nels.) Rydb. Stems several, 2-4 dm. high, branched; 

 leaves either reduced to a naked slender rachis, 4-7 cm. long, or bearing 5-7 

 distant linear-oblong or linear leaflets, 8-15 mm. long; raceme lax, 3-10-flowered; 

 calyx-tube 3 mm. long; teeth triangular, 0.5 mm. long; corolla about 1 cm. long; 

 pod about 3 cm. long, strigose. A. junciformis A. Nels. Sandy or stony 

 plains: Wyo. Submont. Je. 



24. H. junceus Nutt. Stems single or few, 3-6 dm. high, canescent-stri- 

 gose, branched; lower leaves with 3-5, narrowly linear or oblanceolate-linear 

 leaflets 1-3 cm. long, the upper usually reduced to the long slender rachis, curved 

 at the tip; racemes 3-10-flowered, lax; calyx-tube 3 mm. long; teeth triangular, 



1 mm. long or less; pod strigose, linear, 2.5-3 cm. long, 4 mm. wide. A. junceus 

 A. Gray. A. dwersifolius A. Gray. Sandy plains: Mont. Wyo. (? Colo.) 

 Ariz. Ida. Plain Submont. Je-Jl. 



25. H. decumbens Nutt. Stems decumbent, 1-2 dm. high, sparingly 

 strigose or glabrate; leaflets 7-11, narrowly linear-lanceolate, 5-10 mm. long, 

 about 1 mm. wide, strigose on both sides; raceme short, but loose, 5-10-flowered; 

 calyx-tube about 2 mm. long; teeth subulate, scarcely 1 mm. long; corolla ochro- 

 leucous, tipped with purple; pod linear, arcuate, 2-2.5 cm. long, 3 mm. wide, 

 finely strigillose. A. decumbens A. Gray. Sandy plains: Wyo. Mont. Wash. 

 Je-Jl. 



26. H. strigosus (Coult. & Fish.) Rydb. Stems decumbent or ascending, 

 1.5-3.5 dm. high, strigose; leaflets 13-21, narrowly linear or linear, 1-2 cm. long, 

 strigose on both sides; raceme slender, lax, 10-20-flowered; calyx-tube 2.5 mm. 

 long; teeth subulate, of the same length; corolla 1 cm. long; pod sessile, linear, 

 about 2 cm. long, 3-3.5 mm. broad, strigose. A. strigosus Coult. & Fish. A. 

 griseopubescens Sheld. Dry ground: Mont. Wash. Plain Submont. Je-Jl. 



27. H. tenuifolius Nutt. Stems decumbent, less than 2 dm. high, stri- 

 gose-canescent; leaflets 7-13, linear or subulate, 5-15 mm. long, about 1 mm. 

 wide, strigose-canescent on both sides; raceme short, lax, 3-8-flowered; calyx-tube 

 campanulate, about 2 mm. long; teeth 0.5-0.7 mm. long; corolla 6-8 mm. long; 

 pod linear, strigose, 12-15 mm. long, 2.5-3 mm. wide. A. campestris Coult. A: 

 Nels., not A. Gray. Dry hills and mountains : Mont. Colo. Utah. Submont. 



Mont. Je-Jl. 



28. H. divergens (Blankinship) Rydb. Stems numerous, 1-1.5 dm. (rarely 



2 dm.) high, grayish strigose, decumbent; leaflets 9-15, canescent-strigose, linear 

 to lance-oblong, 4-8 mm. long, 1-2.5 mm. wide; racemes 6-15-flowered; calyx 

 strigose with dark hairs; tube scarcely 2 mm. long; teeth subulate, fully 

 long; corolla 6 mm. long, white, purple-tinged, with purple veins and purple- 

 tipped keel; pod linear, 12-15 mm. long, 2-2.5 mm. wide. A. divergens 

 inship. Homalobus camporum Rydb., in part. Dry hills and mountain tops: 

 Mont. Wyo. Utah. Plain Mont. 



29. H. serotinus (A. Gray) Rydb. Stems ascending or erect, slender, '. 

 dm. high, strigose; leaflets 9-21, linear to lance-oblong, acute, glabrous ah 

 strigose beneath, 1-3 cm. long, 2-4 mm. wide; racemes lax, 5- 



tube about 2.5 mm. long; teeth subulate, less than 1 mm. long; corolla purpl 



