PEA FAMILY 479 



pod linear, 2-3 cm. long, strigose. H. puberula Benth. Sandy places in the 

 mountain valleys: Utah- — n Ariz.- — N.M. Son. — Suhmont. Jl-S. 



4. A. nummularius (M. E. Jones) Woot. & Standi. Stem 1-2 dm. high, 

 diffusely branched, often prostrate; leaves short-petioled or the upper subsessile, 

 ashy gray; leaflets oblong to linear-oblong, 0.5-1.5 cm. long or those of the lower 

 leaves still smaller and roimded-oval; peduncles mostly l-flowered; calyx-teeth 

 subulate, 3 mm. long; coroUa light yellow; pod 1.5-2 cm. long, strigose. H. rigida 

 nummularia M. E. Jones. Sandy soil: Utah — Ariz. — N.M. Son. Ap-My. 



5. A. longebracteatus Rydb. Stems 2-3 dm. long, diffusely branched, 

 grayish strigose; leaflets 4-5, thick, gra^'ish strigose, linear to oblong, or of the 

 lowest leaves obovate, 1-1.5 cm. long, or the lower shorter; peduncles 4-5 cm. 

 long, 1-2-flowered; bracts linear, about equalling the calyx; calyx-teeth about 4 

 mm. long, subulate; corolla about 14 mm. long, strongly curved upwards; pod 

 linear, straight, 2.5-3 cm. long, pubescent. L. longebracteatus Rydb. Canons 

 and rocky places: Nev. — s Utah — Ariz. Son. Ap-Je. 



6. A. rigidus (Benth.) Rydb. Stems more or less suffruticose, decumbent 

 at the base, branched, strigose, 3-6 dm. high; leaves short-petioled; leaflets 3-5, 

 obovate or cuneate, obtuse or rounded or refuse at the apex, 4-10 mm. long; 

 peduncles 5-15 cm. long, 1-3-flowered ; bracts minute; calj-x-teeth lance-subulate, 

 3 mm. long; pod erect or ascending, 2-4 cm. long, sparingly strigose or glabrate. 

 H. rigida Benth. Sandy soU: N.M. — s Utah — Ariz.; Mex. So7i. 



11. SYRMATIUM Vogel. 



Perennial herbs. Leaves alternate, pinnately 3- or 5-foliolate, with gland- 

 like stipules. Flowers perfect, in 1-few-flowered umbels. Calyx campanulate, 

 deciduous with the pods; teeth 5, nearly equal. Petals free; banner ovate or 

 rounded, its claw remote from those of the otlier petals; wings obovate; keel 

 broad and obtuse. Stamens diadelphous; the alternate filaments dilated and 

 thickened below the anthers; anthers subequal. Pods usually small, arcuate, 

 slender-pointed, indehiscent, few-seeded. 



1. S. decumbens (Benth.) Greene. Cespitose perennial; stems several, 

 ascending to procumbent, 3-7 dm. long, hirsute-strigose ; leaflets 3-5, obovate, 

 5-10 mm. long, rounded to acutish at the apex, villous; peduncles 1 cm. long or 

 less; heads 3-10-flowered, usually with a 1-3-foholate leafy bract; calyx-teeth 

 setaceous, 2.5 mm. long; coroUa yellow, about 8 mm. long; pod curved in a half- 

 circle, strigose; body nearly 1 cm. long; beak about 5 mm. long. Hosackia de- 

 cumbens Benth. Lotus Douglasii Greene. Prairies, shores and hillsides: Wash. 

 —Ida.— Calif. Suhmont. My-Au. 



12. AMORPHA L. False Indigo, Shoe-strings. 



Shrubs, with glandular-punctate fohage. Leaves alternate, odd-pinnate. 

 Flowers perfect, incomplete, in spike-like racemes. Calyx subcampanulate; 

 lobes 5, short. Corolla incomplete; banner erect, clawed, folded around the 

 stamens, blue, purple or white; wings and keel lacking. Stamens 10; filaments 

 united at the base only. Ovary 2-ovuled. Pods short, 1-2-seeded, nearly inde- 

 hiscent. 



Tall shrub; leaflets 2-5 cm. long; pods usually 2-seeded; leaves petioled; pod curved. 



1. A. angustifolia. 

 Low shrubs; leaflets 0.5-1.5 cm. long; pods 1-seeded. 



Glabrous or nearly so; spikes usuallj solitary at the end of the branches; leaves peti- 

 oled; pod straight. 2. A. nana. 

 Densely canescent; spikes usually clustered; leaves subsessile; pod curved. 



3. A. canescens. 



1. A. angustifolia (Pursh.) Boynton. Branched shrub, 1.5-5 m. high; 

 young growth finely strigose-canescent ; leaflets 9-27, oval to oblong, 2-4 cm. 

 long, mostly acute at both ends, minutely puberulent; racemes .5-20 cm. long; 

 calyx about 3.5 mm. long; upper two lobes rounded, the others triangular, 

 pointed, the lowest almost twice as long as the rest; banner broadly obovate, 

 short-clawed, 4.5-5 mm. long; pod 6-7 mm. long. A. fruticosa Coult., not L. 

 Banks of streams: la. — Ark. — Tex. — Ariz. — Mont. Plain. My-Jl. 



