PEA FAMILY 519 



Corolla yellow, ochroleucous or white, with a purple spot on the keel. 



Peduncles decumbent, curved, 1 dm. long or less. 25. A. alpicola. 



Peduncles erect, 2 dm. high or more. 



Peduncles with long loose hairs. 26. A. tillosus. 



Peduncles appressed-hairy. 

 Flowers 12-15 mm. long. 



Lower leaves with conspicuously shorter and broader leaflets; flowers 



more or less spreading. 22. A. dispar. 



L^ver leaves similar to the upper or nearly so; flowers strongly ascend- 

 ing. 27. A. gracilis. 

 Flowers 18-25 mm. long; pods coriaceous. 



Corolla yellow; banner and wings narrower than in the next, slightly 



notched; legume nearly 2-celled. 28. A. spicatus. 



Corolla white or straw-colored, banner and wings fully 1 cm. wide, 



deeply notched; legume half 2-celled. 29. A. albiflorus. 



Plant more or less viscid. 



Calyx not black-hairy; pods abruptly acuminate; base of the plant with long yellow 



hairs. 30. A. riscidus. 



Calyx black-hairy; pods long-acuminate; base of the plant not yellow-hairy. 



31. A. viscidulus. 

 VI. VERTICILLATI. 



Bracts usually shorter than the flowers. 



Leaflets lance-oblong to elliptic, densely silky-pubescent. 32. A. Richardsonii. 



Leaflets linear-lanceolate, rather sparingly silky. 33. A. galioides. 



Bracts much exceeding the flowers. 34. A. splendens. 



1. A. deflexus (Pall.) Heller. Stem 1-4 dm. high, villous, flexuose; leaflets 

 25-41, lanceolate or ovate, green, loosely villous, 5-20 mm. long, rounded at 

 the base, acute at the apex; raceme usually lax, 5-10 cm. long; calyx black-hairy, 

 tube 4 mm. long; teeth subulate, 3 mm. long; corolla 6-9 mm. long, dirty white 

 below, blue at the apex; pod oblong, black-hairy. 0. deflexa (Pall.) DC. Damp 

 places: Sask. S.D. N.M. Ida. Alaska. Mont. Subalp. Je-Au. 



2. A. foliolosus (Hook.) Rydb. SubacaulesCent; leaflets 13-31, ovate or 

 elliptic, 3-8 mm. long, villous, green, acutish or obtuse; calyx black-villous; tube 

 5-6 mm. long; teeth subulate, 3 mm. long; corolla bluish purple, 8-10 mm. long; 

 legume ellipsoid, black-hairy. 0. foliolosa Hook. High mountains: Alta. 

 Colo. Yukon. Subalp. Jl-Au. 



3. A. multiceps (Nutt.) Heller. Pulvinate perennial; leaflets 7-9, elliptic to 

 lanceolate, densely canescent, with appressed silky hairs, 5-10 mm. long, acute; 

 peduncles 1-4 cm. long, 2-3-flowered; calyx silky-villous; tube 8-10 mm. long; 

 teeth lanceolate, 3 mm. long; corolla reddish purple; keel with a very short por- 

 rect beak; legume ellipsoid, silky-strigose, 1 cm. long, with a very narrow partial 

 partition. O. multiceps Nutt. Hills and mountains: Neb. (? Mont.) Wyo. 

 Colo. Plain Submont. My-Je. 



4. A. minor (A. Gray) Cockerell. Pulvinate perennial; leaflets 5-9, lanceolate 

 or oblong, 3-6 mm. long, acute, silky, but pubescence somewhat looser than in A. 

 multiceps; peduncles 0.5-3 cm. long; calyx silky-villous; tube 6-7 mm. long; teeth 

 lanceolate, 2-3 mm. long; corolla dark purple; keel with a slender ascending beak; 

 legume ovoid, thin, silky, about 8 mm. long; partial partition narrow. 0. m ulticeps 

 minor A. Gray. High mountains: Colo. Wyo. Submont. Mont. My-Jl. 



5. A. collinus A. Nels. Plant very hairy at the base; leaflets 7-13, oblong 

 to linear-lanceolate, acute, 1-3 cm. long, densely white-silky, with long appressed 

 hairs; scapes several, 1-2 dm. high; spike 10-20-flowered; calyx villous with long 

 silky hairs; tube 7 mm. long; teeth lanceolate, 3 mm. long; corolla 18-20 mm. 

 long; keel with a dark spot and a short porrect tip; legume oblong-elliptic, vil- 

 lous, nearly filling the calyx. Mountains: Wyo. (? Mont.). Submont. 



6. A. Blankinshipii A. Nels. Leaflets 7-17, oblong, acute at both ends, 

 8-16 mm. long, canescent with appressed hairs; scapes erect, 5-10 cm. long; 

 spike in fruit 2-5 cm. long; calyx villous with long hairs; tube 6-7 mm. long; 

 teeth triangular or lanceolate, 2-3 mm. long; corolla dark purple, about 15 mm. 

 long; legumes ovoid, about 1 cm. long, coriaceous, only partly 2-celled. 



and plains: Mont. Wyo. Ida. Submont. My-Je. 



7. A. nanus (Nutt.) Greene. Pulvinate perennial; leaves usually spread- 

 ing; leaflets 7-13, oblong or lanceolate, 5-10 mm. long, appressed silky; peduncles 

 decumbent or ascending, 2-5 cm. long; calyx villous, often with partly black 

 hairs; tube about 6 mm. long; teeth lanceolate, 3 mm. long; corolla dark purple, 



