400 NORTH AMERICAN FLORA [Volume 24 



2. Brachyphragma Serenoi (Kuntze) Rydb. Am. Jour. Bot. 

 16: 205. 1929. 



Astragalus nudus S. Wats. Bot. King's Expl. 74. 1871. Not .4. nudus Clos. 1846. 

 Tragacantha Serenoi Kuntze, Rev. Gen. 941. 1891. 

 Astragalus obtains Sheldon, Minn. Bot. Stud. 1: 19. 1894. 

 Astragalus Serenoi Sheldon, Minn. Bot. Stud. 1: 130. 1894. 

 Astragalus canonis M. E. Jones, Contr. W. Bot. 8: 15. 1898. 



A perennial, growing in clumps; stems tall, 4-7 dm. high, glabrous, striate, branched below; 

 leaves 1-1.5 dm. long, spreading; stipules 2-5 mm. long, deltoid, the upper green, reflexed, 

 the lower ones scarious; leaflets 3-7, those of the upper leaves linear or narrowly oblong, acute 

 at each end, 2-3 cm. long, 1-4 mm. wide, sparingly strigose but soon glabrate above, perma- 

 nently silvery-strigose beneath, those of the lower leaves oval, 12-15 mm. long; peduncles 

 1-2 dm. long, erect; racemes often 1 dm. long, lax; bracts subulate, 2 mm. long; pedicels about 

 1 mm. long; calyx black-strigose, tapering at the base, the tube 7 mm. long, 3 mm. wide, the 

 teeth subulate, 3 mm. long; corolla purple with a white base, with darker veins; banner about 

 20 mm. long, obovate, moderately arched, notched at the apex; wings 18 mm. long, the blade 

 oblong-falcate, with a large reflexed auricle; keel-petals slightly shorter, the blade lunate, 

 rounded at the apex; pods woody, oblong, about 3 cm. long, 1 cm. thick, abruptly acuminate 

 at each end, subterete, the septum 3-4 mm. wide, disappearing in the upper one-fourth of the 

 pod. 



Type locality: West Humboldt Mountains, Nevada. 

 Distribution: Nevada and eastern California. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 32, f. 110. Ill; pi. 74, f. Ill; Am. Jour. Bot. 

 16: pi. 17 S. 



3. Brachyphragma Shockleyi (M. E. Jones) Rydberg. 



Astragalus Shockleyi M. E. Jones, Proc. Calif. Acad. II. 5: 659. 1895. 

 Astragalus Serenoi M. E. Jones, Rev. Astrag. 150, in part. 1923. 



A perennial; stem 5 dm. high or more, branched, flexuose, striate or angled, sparingly 

 strigose; leaves spreading, 6-10 cm. long, the rachis stiff and striate; stipules broadly deltoid, 

 about 1 mm. long; leaflets 3-7, rather deciduous, linear, 1-2 cm. long, 1-2 mm. wide, strigose, 

 acute; peduncles strict, 1—1.5 dm. long; bracts lanceolate, 1-2 mm. long; flowers unknown; 

 pod oblong, 12-15 mm. long, 6 mm. wide and thick, coriaceous, somewhat fleshy when young, 

 cross-reticulate in age, abruptly contracted at each end, the sutures prominent, the cross- 

 section round, the septum 2 mm. wide, not extending to the apex. 



Type locality: Fish Lake Valley, Nevada. 

 Distribution: Known only from the type locality. 

 Illustrations: M. E. Jones, Rev. Astrag. pi. 32; pi. 74, f. 110. 



4. Brachyphragma mohavense (S. Wats.) Rydberg. 



Astragalus mohavensis S. Wats. Proc. Am. Acad. 20: 361. 1885. 



A shortlived perennial, with a taproot, beginning blooming the second season; stem 

 branched from the base, 2-4 dm. high, striate, densely white-strigose; leaves spreading, 3-8 

 cm. long; stipules deltoid, 3-4 mm. long, densely hairy; leaflets 5-9, obovate, cuneate at the 

 base, rounded or truncate at the apex, 7-15 mm. long, 5-10 mm. wide, densely white-strigose, 

 silvery; peduncles 4—7 cm. long; racemes 3-4 cm. long; bracts lanceolate, 2 mm. long; calyx 

 strigose, the tube 3-4 mm. long, the teeth subulate, 3 mm. long; corolla purplish, S-10 mm. 

 long; banner rather moderately arcuate, obovate; wings shorter, the blade oblanceolate or 

 oblong, nearly straight; keel-petals nearly as long, the blade broadly lunate, deeply purple- 

 tipped; pod oblong, slightly falcate, abruptly acute at each end, 2 cm. long, 3 mm. thick and 

 5 mm. wide, cross-reticulate, strigose, the upper suture acute, the lower somewhat flat, or, 

 sulcate the cross-section obovate. 



Type locality: Newberry Spring, Mohave Valley, California. 



Distribution: Mohave Desert, California. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 28 (illustration of the pod poor); pi. 72 (better). 



