Part 7, 1929] FABACEAE: GALEGEAE 457 



4. Hesperastragalus peonis (M. E. Jones) Rydberg, sp. nov. 



Astragalus dipkacus peonis M. E. Jones, Contr. W. Bot. 10: 65. 1902. 



Apparently a perennial; stems decumbent or prostrate, silvery-canescent, 1-2 dm. long; 

 leaves ascending, 3-5 cm. long; stipules deltoid, erect, 3 mm. long; leaflets 15-21, oblong or 

 elliptic 5-7 mm long, conduplicate, densely white-strigose beneath, glabrate above; peduncles 

 5-6 cm long; racemes short, 1.5-2.5 cm. long; bracts lanceolate, 1 mm. long; pedicels very 

 short- calyx strigose with mixed black and white hairs, the tube 2.5-3 mm. long, the teeth 

 lanceolate 1 mm. long; corolla 6 mm. long, according to the original description white, but 

 a note on' the type sheet states "flowers yellow," and they are yellowish in the specimens; 

 banner obovate, strongly arcuate; wings nearly as long, the blade obliquely oblong-oblanceolate, 

 falcate; keel-petals shorter, the blade broadly lunate; pod strigulose, 5-6 mm. long, 4 mm. 

 wide, 6 mm. thick, cross-reticulate, mucronate, rounded, sulcate on both sutures. 



Type locality: Zacatecas. 



Distribution: Known only from the type locality. 



Illustration: M. E. Jones, Rev. Astrag. pi. 71. 



5. Hesperastragalus brazoensis (Buckl.) Rydb. Bull. Torrey 



Club 53: 166. 1926. 



Astragalus brazoensis Buckl. Proc. Acad. Phila. 1861: 452. 1862. 

 Tragacantha brazoensis Kuntze, Rev. Gen. 943. 1891. 



An annual; stem branched at the base, erect, or decumbent at the base, 1-4 dm. high, 

 sparingly strigose, striate; leaves ascending, 3-6 cm. long, the rachis sparingly strigose; stipules 

 deltoid 3 mm. long; leaflets 13-15, cuneate or oblong-obovate, retuse at the apex, 5-10 mm. 

 long glabrous above, sparingly strigose beneath, often only on the margins and midribs; 

 peduncles 5-8 cm. long, ascending; racemes 1-4 cm. long; bracts lance-subulate, 1-2 mm. 

 long- calyx sparingly strigose, the tube campanulate, 1.5 mm. long, the teeth subulate, 2 mm. 

 long' corolla purplish or white, with purple-tipped keel; banner broadly obovate, slightly 

 retuse abruptly arcuate at the middle; wings shorter, the blade obliquely oblong-oblanceolate, 

 falcate- keel-petals slightly shorter, the blade semi-orbicular, obtuse at the tip; pod distinctly 

 stipitate, cross-reticulate, 5-7 mm. long and as thick, 4 mm. wide, deeply sulcate on the lower 

 suture, the dorsi-ventral view suborbicular, subcordate at the base and abruptly beaked at the 

 apex; seeds 2 or 3 in each cavity. 



Type locality: Western Texas. 



Distribution: Texas and Tamaulipas. 



Illustration: M. E. Jones, Rev. Astrag. pi. 71, f. 27 J. 



6. Hesperastragalus dispermus (A. Gray) A. Heller, Muhlenbergia 

 1: 137. 1906. 



Astragalus dispermus A. Gray, Proc. Am. Acad. 13: 365. 1878. 



An annual; stem branched at the base, 1-2 dm. long, the branches ascending or decumbent, 

 slender, minutely strigose, sometimes purplish; leaves 2-5 cm. long, ascending or spreading; 

 stipules deltoid, acuminate, 3 mm. long; leaflets 7-11, cuneate or oblong-cuneate, 2-7 mm. 

 long, usually deeply notched, white-hairy on both sides; peduncles 3-5 cm. long, ascending; 

 racemes dense and head -like, the flowers sub-sessile; bracts subulate, 2 mm. long; calyx pilose 

 with long white hairs, the tube 2 mm. long, the teeth subulate-filiform, slightly longer; corolla 

 purple or white; banner obovate, 6-7 mm. long, abruptly arched at the middle, retuse; wings 

 slightly shorter, the blade obliquely oblong-oblanceolate; keel-petals still shorter, the blade 

 semi-orbicular, obtuse, often very dark; pod pubescent with rather short white hairs, strongly 

 cross-ribbed, 3-4 mm. long, 1.5-2 mm. wide, 2.5 mm. thick, the lateral view obliquely ovoid, 

 the dorsi-ventral one rounded-ovoid, the cross-section broadly cordate; seeds mostly solitary 

 in each cavity. 



Type locality: Wickenburg, Arizona. . . 



Distribution: Western Arizona, southern Cahtornm.and Lower Caiiiornia. 

 Illustration: M. E. Jones. Rev. Astrag. pi. 71, f. 270. 



