PEA FAMILY 505 



10. X. argophyllus (Nutt.) Rydb. Stems short, decumbent, 5-10 cm. 

 long; leaflets 15-17, lanceolate, 8-15 mm. long, acute: raceme 3-8-flowered; calyx- 

 tube 8-10 mm. long; teeth subulate, about 4-5 mm. long; corolla 15-20 mm. long, 

 purplish; pod oblong-ovoid, with a curved point, about 2 cm. long, transversely 

 wrinkled, rounded on both sutures. ^4. argophyllu^ Xutt. Hills and valleys: 

 Mont. — Wyo. — Utah — Nev. Submont. Je-Jl. 



11. X. uintensis (M. E. Jones) Rydb. Stems pro.strate or decumbent, 

 5-10 cm. long; leaflets lance-oblong to elliptic, 5-10 mm. long, acute; raceme 

 short, few-flowered; calyx-tube about 8 mm. long; teeth subulate, 1..5-2 mm. 

 long; corolla purple, 2-2.5 cm. long; pod ovoid, 2-2.5 cm. long, obcompressed; 

 ventral suture slightly sulcate. A. uintensis M. E. Jones. Drj- ground: Colo. 

 — Xev. — Ariz. Son. — Submont. My-Je. 



12. X. vespertinus (Sheld.) Rydb. Stems 4-6 cm. high, decumbent, 

 striate; leaflets 11-13, obovate-eUiptic, obtuse, 4—12 mm. long; raceme short, 

 3-6-flowe'red ; calyx strigose with mixed black and white hairs; tube about 8 mm. 

 long: teeth subulate, about 1.5 mm. long; corolla 2-3 cm. long, purpLsh; pod 

 2.5-3 cm. long, coriaceous, oblong, obcompressed-triangular in section; upper 

 suture prominent. A. vespertinus Sheld. (?) A. panguicens%s M. E. Jones. Drj^ 

 hiUs: Colo.— X.M. Submont. ]\Iy. 



13. X. missouriensis (Xutt.) Rydb. Stems 5-10 cm. long: leaflets 11-21, 

 elliptic to obovate, 5-15 mm. long; raceme short, 5-]5-flowered; caly.x-tube 7-8 

 mm. long; teeth subulate, 2-2.5 mm. long; corolla purple, 15-20 mm. long; pod 

 oblong, 1.5-2.5 cm. long, 7-8 mm. broad, neither .suture sulcate, rather prom- 

 inent in age. A. 7ni^souriensis Xutt. Plains and hills: Sask. — Kans. — -X.M. — 

 Mont. Plain— Mont. My-Je. 



14. X. cyraboides (M. E. Jonesj Rydb. Stems decumbent, 5-15 cm. long, 

 and matted; leaflets 9-11, elliptic, obtuse, usually about 6 mm. long; calyx-tube 

 about 6 mm. long; legxm;ie oblong-ovoid, 6 mm. wide, 16 mm. long, somewhat 

 4-angled, with rather prominent sutures in age. A. cymhoides M. E. Jones. 

 Gravelly or clayey ground: Utah. Submont. Je-Jl. 



15. X. pygmaeus (Xutt.) Rydb. Plant almost stemless; leaflets 7-11, 

 broadly oval, obovate, or orbicular, 5-10 mm. long: raceme short, subcapitate, 

 few-flowered; calyx strigose with short, partly black hairs; tube about 8 mm. 

 long; teeth 2 mm. long; corolla ochroleucous or purple, about 1.5 cm. long; pod 

 obliqueh- ovoid, 2-3 cm. long, somewhat mottled, pulp}' when young, in age 

 with a membranous, transverseh' reticulate outer coat and a thicker inner 

 one. Phaca pygmaea X'utt. Astragalus Chamaeluce A. Gray. A. Cicadae^l. E. 

 Jones. Hills: Colo. — ^^'yo. — Utah. Sub7nont. M} . 



16. X, musinensis (M. E. Jones) Rydb. Plant nearly acaulescent; leaf- 

 lets 1-3, lanceolate, or eUiptic-lanceolate, 2 cm. or less long; pod ovate, 18 mm. 

 long, 6-8 mm. broad, strigillose, with incurved acute apex, sulcate ventrally at 

 the base; outer coat loose. A. musinensis M. E. Jones. Clayey slopes: Utah. 

 Submont. Je. 



17. X. Newberryi (A. Gray) Rydb. Subacaulescent ; leaflets 3-7, obovate, 

 6-10 mm. long; raceme short, 2-6-flowered; cah'x-tube about 12 mm. long; teeth 

 subulate, 3 mm. long; corolla 2. .5-3 cm. long, ochroleucous, tipped with purple; 

 pod ovoid, about 2 cm. long, somewhat curved, not sulcate. A. Xeuberryi A. 

 Gray. Dry hills: sw Colo. — X.M. — Ariz. — Utah. .Son. Ap. 



18. X. consectus (Sheld.) Rydb. Subacaulescent; leaflets .5-11, oblance- 

 late, acute, 1-2 cm. long; raceme short, 6-8-flowered; calyx-tube about 10 mm. 

 long; teeth subulate, 3—4 mm. long; corolla about 2 cm. long, purpUsh or ochro- 

 leucous tipped with purple; legume ovoid, about 2.5 cm. long, with rather long 

 beak, neither suture sulcate. A. consectus Sheld., in part. A. eriocarpum M. 

 E. Jones, not .S. Wats. Drs- ground: Utah. .Son. — Submont. Ap-My. 



19. X. Watsonianus (Kuntze) Rydb. Subacaulescent; leaflets broadly 

 obovate-cuneate, rounded or retuse at the apex, 10-15 mm. long; flowers capi- 

 tate; calyx villous with black hairs; tube 12-15 mm. long; teeth subulate, 5 mm. 

 long; corolla purplish, nearly 3 cm. long; pod 2.5 cm. long, strongly cur\'ed above 



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