524 FABACEAE 



2. H. americanum (Michx.) Britton. Stem 2-7.5 dm. high, glabrous or 

 nearly so; leaflets 11-21, oblong, 1.5-3 cm. long, rounded at both ends, glabrous 

 above, sparingly hairy beneath; raceme lax; calyx-tube 2 mm. long; teeth 

 triangular, 1-2 mm. long; corolla violet, rarely white, 12-18 mm. long; loment 

 glabrous or nearly so; internodes 3-5, about 5 mm. wide. H. alpinum ameri- 

 canum Michx. H. philoscia A. Nels., a white-flowered form. Rocky places 

 and open woods: Lab. Vt. S.D. Wyo. Alaska. Boreal Mont. Je-Au. 



3. H. boreale Nutt. Stem 3-7 dm. high, strigose especially above; leaflets 

 oblong or lanceolate, rounded to acute at the apex, 1.5-3 cm. long, glabrous 

 above, sparingly pubescent or glabrate beneath; racemes lax; calyx- tube 2 mm. 

 long; teeth triangular, 1-1.5 mm. long; corolla violet or reddish purple to nearly 

 white; loment finely strigose; internodes 2-4, 6-8 mm. long, 5-6 mm. wide. 

 Banks and thickets: Sask. S.D. Wyo. Mack. Boreal Mont. Jl-Au. 



4. H. lancifoliuxn Rydb. Stem 5 dm. high or more, sparingly strigose; 

 leaflets 13-21, lanceolate, acute, about 3 cm. long, 8 mm. wide, slightly strigose 

 or glabrate; raceme lax; calyx strigose; tube about 3 mm. long; lower teeth 2.5 

 mm. long, the upper shorter; corolla aboat 15 mm. long, rose-purple; loment 

 somewhat strigose; internodes 2-4, broadly oval, 12-15 mm. long, 8 mm. wide. 

 Mountain woods: Mont. Alta. Mont. Jl. 



5. H. marginatum Greene. Stem 6-10 dm. high, minutely strigose; leaf- 

 lets 11-23, from oblong to oval or ovate, obtuse to emarginate, 1-3 cm. long, 

 minutely appressed-pubescent on both sides or glabrate above; racemes rather 

 short; calyx-tube 3 mm. long; upper teeth triangular, 1 mm. long, the lowest 

 lanceolate, 2 mm. long; corolla rose-purple; loment strigose; internodes 2-5, 

 8-15 mm. long, 6-8 mm. wide. H. uintahense A. Nels. Draws and copses: 

 Wyo. Colo. Mont. Je-Jl. 



6. H. Mackenzii Richards. Stem 24 dm. high, strigose above; leaflets 

 7-15, elliptic, 1-2.5 cm. long, finely grayish strigose beneath, glabrate above; 

 raceme short; calyx-tube 3 mm. long; teeth 4-5 mm. long; corolla 18-20 mm. 

 long, rose-purple; loments minutely strigose; internodes 5-7 mm. long, about 5 

 mm. wide. Meadows: N. W. Terr. Alta. Yukon. Boreal Subarct. Je. 



7. H. utahense Rydb. Stem 4-6 dm. high, finely strigose; leaflets 11-17, 

 elliptic, oval, or oblong, usually rounded at both ends, 1-3 cm. long, glabrous 

 above, finely cinereous-strigose beneath; calyx-tube nearly 3 mm. long; teeth 

 5 mm. long, attenuate;' corolla rose-purple, 15-18 mm. long; loments minutely 

 strigose; internodes 6-8 mm. long, 5-6 mm. wide. Hills among bushes: Utah 

 Ida. Submont. Mont. My-Jl. 



8. H. pabulare A. Nels. Stems 4-7 dm. high, finely strigose; leaflets 9-15, 

 oblong or elliptic, 1-2 cm. long, glabrous above, cinereous-strigose beneath; 

 calyx-tube about 2 mm. long; teeth 3-4 mm. long; loments minutely puberulent; 

 internodes 5-7 mm. long, 5-6 mm. wide. Copses, canons, and among sage-brush: 

 Mont. N.M. Utah. Submont. My-Jl. 



9. H. carnosulum Greene. Stems flexuose, 2-4 dm. high; leaflets 9-11, 

 pale green, thick, linear-oblong to elliptic, 6-15 mm. long, glabrous above, ciner- 

 eous-strigose beneath; raceme lax; calyx-tube 2 mm. long; teeth 2-3 mm. long; 

 loments minutely strigose; internodes 7-8 mm. long, 5-6 mm. wide. Dry hills: 

 Colo. Utah N.M. Submont. Je-Jl. 



10. H. cinerascens Rydb. Stems 3-5 dm. high, strigose-canescent or 

 glabrate below; leaflets 9-15, oblong or elliptic, 1-2 cm. long, silvery canescent- 

 strigpse on both sides; calyx-tube about 3 mm. long; teeth 5 mm. long; corolla 

 reddish-purple, about 15 mm. long; loment strigose; internodes 3-4, 6-8 mm. 

 long, about 6 mm. wide. H. canescens Nutt., not L. Dry hills: Sask. N.D. 

 Wyo. Utah Ida. Alta. Submont. Je-Jl. 



40. ONOBRYCHIS Scop. SAND-FOIN. 



Herbs or undershrubs. Leaves odd-pinnate, without stipels. Flowers 

 perfect, in spikes or racemes. Calyx-tube campanulate; teeth subulate, sub- 

 equal, the lower smaller. Banner obcordate or obovate, sessile; wings shorter; 



