394 NORTH AMERICAN FLORA [Volume 24 



linear, 1-2 cm. long, 1-2 mm. wide, glabrous above, strigose beneath, obtuse or acute; peduncles 

 1-2 dm. long; racemes 2-5 cm. long; bracts subulate, 3-4 mm. long; pedicels 1-2 mm. long; 

 calyx black-hairy, the tube 5-6 mm. long, 3 mm. wide, the teeth lanceolate or subulate, 2-3 

 mm. long; corolla white, 15-18 mm. long; banner obovate, retuse; wings shorter, the blade 

 oblanceolate, somewhat falcate, with a large basal auricle; keel-petals much shorter, the 

 blade broadly lunate, obtuse, with a large auricle; pod subsessile, the body oblong, rounded at 

 the base, abruptly acute at the apex, cross-reticulate, glabrous, 15-22 mm. long, 4-5 mm. wide, 

 5-6 mm. thick, slightly sulcate on the lower suture, the septum 1-1.5 mm. wide, not extending 

 to the apex; seeds brown, obliquely reniform, 2.5 mm. long. 



Typb locality: John Day Valley, Oregon. 

 Distribution: Oregon and Washington. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 36. 



24. Tium obscurum (S. Wats.) Rydberg. 



Astragalus obscurus S. Wats. Bot. King's Expl. 69. 1871. 

 Tragacantha obscura Kuntze, Rev. Gen. 946. 1891. 



A perennial, with a woody root and short cespitose caudex; stems decumbent or ascending, 

 1—3 dm. long; leaves 5-10 cm. long; stipules deltoid, 3-4 mm. long; leaflets 9-13, oblong to 

 oval or obovate, rounded or retuse at the apex, 5-10 mm. long, 2-4 mm. wide, strigose on both 

 sides; peduncles 5-10 cm. long; racemes 1-5 cm. long; bracts lanceolate, 2 mm. long; pedicels 

 1 mm. long; calyx strigose, the tube 3-3.5 mm. long, the teeth lanceolate, 1.5 mm. long; corolla 

 white, about 8 mm. long; banner obovate, notched at the apex, rather strongly arcuate at the 

 middle; wings shorter, the blade obliquely lanceolate, falcate, with a large auricle; keel-petals 

 still shorter, the blade broadly lunate, strongly arched at the middle, acutish; pod subsessile, 

 the body linear-oblong, acute at each end, strigose, 2-2.5 cm. long, 3 mm. wide and thick, 

 sulcate on the lower suture, the septum 1.5 mm. wide, nearly meeting the upper suture. . 



Type locality: Truckee Pass. Nevada. 

 Distribution: Nevada and eastern California. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 41, f. 137. 



25. Tium miserum (Dougl.) Rydberg. 



Astragalus miser Dougl.; Hook. Fl. Bor. Am. 1: 153. 1838. 



A perennial, with a cespitose caudex; stems 0.5-1.5 dm. high, ascending, strigose; leaves 

 ascending, 3-7 cm. long; stipules deltoid, 2-3 mm. long; leaflets 9-15, linear or oblong, 3-10 

 mm. long; 1-2 mm. wide, strigose on both sides; peduncles 6-10 cm. long, slender, strigose; 

 racemes 2-5 cm. long; calyx strigose, partly with black hairs, the tube 3 mm. long; corolla 

 ochroleucous, with purple-tipped keel, 8-10 mm. long; banner obovate, moderately arched; 

 wings shorter, the blade oblong-falcate, with a large basal auricle; keel-petals as long as the 

 wings, the blade broader; pod nearly sessile, the body linear, 1.5-2 cm. long, acute at each end, 

 strigose, sulcate on the lower suture, the septum about 1 mm. broad. 



Type locality: Low hills of Spokane River, Washington. 



Distribution: Washington to Idaho and Nevada. 



4. Atrata. Pod leathery, short-stipitate or subsessile, reflexed, the body linear, straight or 

 curved downward, subterete in cross- section. Slender plants with very small white or purple- 

 tinged flowers, in slender racemes. 



26. Tium atratum (S. Wats.) Rydberg. 



Astragalus alratus S. Wats. Bot. King's Expl. 69. 1871. 



Tragacantha atrata Kuntze. Rev. Gen. 943. 1891. 



Astragalus alratus stenophyllus M. E. Jones, Zoe 3: 297. 1893. 



Astragalus atralus arclus Sheldon, Minn. Bot. Stud. 1: 160. 1894. 



Astragalus atratus phyllophorus M. E. Jones, Contr. W. Bot. 10: 62. 1902. 



Hamosa atrata Rydb. Bull. Torrey Club 34: 48. 1907. 



A perennial, with a woody root and short caudex; stems ascending, slender, 1-3 dm. high, 

 strigose or glabrate; leaves ascending, 4-10 cm. long; stipules deltoid, 2 mm. long; leaflets 

 9-15, linear or oblong, 4-15 mm. long, 1-2 mm. wide, obtuse, strigose on both sides or glabrate 



