PEA FAMILY 519 



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



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



Peduncle erect, 2 dm. high or more. 



Pedtmcles with long loose hairs. 26. A. rillostis. 



Pedtmcles appressed-hairy. 

 Flowers 12—15 mm. long. 



Lower leaves with conspicuously shorter and broader leaflets; flowers 



more or less spreading. 22. A. dispar. 



Lower leaves similar to the upper or nearly so; flowers strongly ascend- 

 ing. 2t. A. gracilis. 

 Flowers lS-25 mm. long: pods coriaceous. 



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



notched : legume nearly 2-celled. 2S. A. spicatus. 



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

 deeply notched ; legume half 2-ceUed. 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. riscidulus. 

 XI. TERTicrLL.\Tl. 



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. deflezus (Pall.j Heller. Stem 1— t 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; cal}"x black-hair>-, 

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

 below, blue at the apex; pod oblong, black-hair>". O. deflexu (Pall.j DC. Damp 

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



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

 eUiptic, 3-S mm. long, ^-illous, green, acutish or obtuse; cah"x black- villous; tube 

 5h3 mm. long; teeth subulate, 3 mm. long; coroUa bluish purple, 8-10 mm. long; 

 legume ellipsoid, black-hairj-. O. foliolosa Hook. High motmtaios; Alta. — 

 Colo. — Yukon. Subalp. Jl-Au. 



3. A. multiceps (Xutt.; HeUer. Pul\-inate perennial; leaflets 7-9, elHptic to 

 lanceolate, den.?ely canescent, with appressed silky- hairs, 5-10 mm. long, acute; 

 pedtmcles 1— i cm. long, 2-3-flowered: cahrs siUiy-villous: tube S-10 mm. long; 

 teeth lanceolate, 3 mm. long; coroUa reddish purple; keel with a ver\- short por- 

 rect beak; legume eUipsoid, silk}--5trigo5e , 1 cm. long, with a ver\- narrow partial 

 partition. 0. muUiceps Xutt. HiH.^ and motintains: Neb. — (? Mont.j — W30. 

 — Colo. Plain — Submont. My-Je. 



4. A. minor (A. Grayj CockereU. Pulvinate perennial; leaflets 5-9, lanceolate 

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

 muUiceps; peduncles 0.5-3 cm. long; cal^i-x silky-%-illous; tube 6-7 mm. long; teeth 

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

 legume ovoid, thin, silliy, about 8 mm. long; partial partition narrow. 0. m uUiceps 

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



5. A. collinus A. Xels. Plant ven.- hair>- 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 10-2d-flowered; cal}"x villous with long 

 silky hairs: tube 7 mm. long: teeth lanceolate, 3 mm. long: coroUa 18-20 mm. 

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

 lous, nearly filling the calyx. Moimtains: Wyo. — (? Mont.j. Submont. Jl. 



6. A. Blanktoshipii A. Xels. Leaflets 7-17, oblong, acute at both ends, 

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

 spike in fruit 2-5 cm. long; cah^x -s-iUotis 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. Hills 

 and plains: Mont. — Wyo. — Ida. Submont. Mj'-Je. 



7. A. nanus (Xutt.) Greene. Pul^-inate 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; cah-x villous, often with partly black 

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



