488 FABACEAE 



mm. long; corolla purplish, or ochroleucous tipped with purple, 10-12 mm. long; 

 calyx-teeth triangular-subulate; legume ellipsoid, 2.5-3.5 cm. long, strigose, 

 stipe about equalling the calyx. A. allochrous A. Gray. Hillsides: Ariz.— Ida. 

 Son. Ap-Je. 



5. P. Eastwoodiae (M. E. Jones) Rydb. Perennial, with a cespitose 

 woody caudex; stem about 1.5 dm. high, glabrous; leaflets about 21, narrowly 

 oblanceolate or linear, 4-10 mm. long; calyx-tube about 6 mm. long, glabrous; 

 corolla purple; stipe of the pod about 2 mm. long; body ovoid, 2 cm. long, gla- 

 brous, sulcate on the upper side. River valleys: Utah — Colo. Son. My. 



6. P. lutosa (M. E. Jones) Rydb. Perennial, with fleshy taproot, and 

 several scaly stolons; leaflets about 12 pairs, mostly folded, oval, 6 mm. long, 

 obtuse, strigose; flowers 1-4, in almost sessile axillary clusters; bracts hyaline; 

 corolla white; fruit glabrous, sulcate on both sutures', but less so on the dorsal 

 one. A. lutosus M. E. Jones. River bottoms: Utah. So7i. My. 



7. P. longifolia (Pursh.) Nutt. Perennial, with horizontal rootstocks; 

 stem erect, 1.5-4 dm. high; leaves 5-15 cm. long, grayish canescent; leaflets 

 often none, the terminal represented by the prolonged rachis or contiguous with 

 it, sHghtly if at all flattened; the lateral ones if present 1-4, linear-filiform, 1-2.5 

 cm. long; raceme few-flowered; caly^x strigose; tube campanulate, 2 mm. long; 

 teeth sulaulate, 1.5 mm. long; pod ellipsoid, papery, 2-3 cm. long, 12-18 mm. 

 broad, mottled, glabrous. A. pictus filifolius A. Gray. Sand hills: S.D. — Ida. 

 — N.M. — Ariz. PlainSon. My-JL 



8. P. picta A. Gray. Perennial, with a horizontal rootstock; stems 1-2 dm. 

 long, slender, grayish strigose-canescent; leaves 3-8 cm. long; leaflets 9-15, 

 linear, strigose-canescent, 5-20 mm. long; racemes 3-10-flowered; calyx strigose, 

 with white, or mixed white and black hairs; tube campanulate, 2 mm. long; 

 teeth subulate, 1.5 mm. long; corolla ochroleucous, 7 mm. long; pod elliptic, 

 mottled, 15-18 mm. long, 8 mm. wide, acute at both ends. A. ceramictis Sheld. 

 Dry sandy places: Colo. — N.M. — Utah. Son. — Submont. My. 



9. P. Cusickii (A. Gray) Rydb. Perennial, with a persistent caudex; 

 stems 3-5 dm. high, spaiingly strigose or glabrous; leaflets 7-13, narrowly linear, 

 4-20 mm. long; raceme lax; calyx strigose, with black hairs; tube campanulate, 

 3 mm. long; teeth triangular, 1 mm. long; corolla white; pod 2-3 cm. long, 

 mottled, ovoid, glabrous. A. Cusickii A. Gray. Dry ground: Ida. — Ore. 

 Son. 



10. P. artipes (A. Gray) Rydb. Perennial, with a cespitose caudex; stems 

 1-3 dm. high, glabrous; leaflets 11-17, oval or obovate to oblong, refuse, 7-12 

 mm. long, glabrous; raceme short, few-flowered; calyx glabrous, or with a few 

 scattered black hairs; tube campanulate, about 5 mm. long; teeth subulate, 3 

 mm. long; corolla white, 15 mm. long; pod mottled, about 3 cm. long, ovoid, 

 short-acuminate, the upper suture nearly straight. A. artipes A. Gray. Moun- 

 tains: Colo. — Utah — Ariz. Submont. — Mont. Je. 



11. P. Hookeriana T. & G. Perennial, with a deep root and cespitose 

 caudex; stems cinereous, 1-2 dm. high, decumbent; leaflets 13-19, oblong, strigose- 

 canescent on both sides, 5-10 mm. long; racemes short, few-flowered; calyx-tube 

 3-4 mm. long, more or less black hairy; teeth subulate, 2 mm. long; corolla 

 ochroleucous, 8-10 mm. long; pod obovoid, 2-3 cm. long, mottled, glabrous; 

 stipe about as long as the calyx. Hills and ridges: Ore. — Ida. — Nov. — Colo. 

 Submont.— Mont. My-Jl. 



12. P. megacarpa Nutt. Subacaulescent, cespitose perennial; leaflets 9-13, 

 broadly oval, 8-12 mm. long, sparingly strigillose, in age glabrate, rounded or 

 retuse at the apex; racemes 3-6-flowered, calyx sparingly strigillose, with black 

 hairs, 8 mm. long; teeth lanceolate, 3 mm. long; corolla ochroleucous, about 2 

 cm. long; legume elongate-ovoid, 1.5-2 cm. broad, papery, glabrous. A. 

 megacarpus (Nutt.) A. Gray. Plains and dry draws: Wyo. — Utah. Son. — 

 Submont. 



13. P. Wardii (A. Gray) Rydb. Perennial, with a cespitose caudex; stems 

 3-4 dm. high, glabrous, leafy; leaflets 9-17, oblong, obtuse or retuse, 6-12 mm. 



