300 



PAPILIONACEAE. 



[VOL. II. 



10. Astragalus racemosus Pursh. Racemose Milk Vetch. (Fig. 2134.) 



Astragalus racemosus Pursh, Fl. Am. Sept. 740. 

 1814. 



Erect or ascending, finely pubescent, branched 

 at the base; stem somewhat zigzag, i-2 high. 

 Stipules ovate-lanceolate, membranous, 2 // ~3 // 

 long; leaflets 17-21, elliptic or linear-oblong, 

 acutish or mucronate, io // -i5 // long; peduncles 

 equalling or exceeding the leaves; flowers yel- 

 lowish-white, 8"-9" long, in loose spike-like 

 racemes; pedicels i // -2 // long; pods linear-ob- 

 long, imperfectly 2-celled by the intrusion of the 

 dorsal suture, triangular in section, acute at 

 each end, glabrous, stipitate, broadly sulcate, 

 pendent, about i' long. 



Prairies, Nebraska and Colorado, north to the 

 Northwest Territory. June-July. 



ii. Astragalus bisulcatus (Hook.) A. 



Gray. Two-grooved Milk Vetch. 



(Fig. 2135.) 



Phaca bisulcata Hook. Fl. Bor. Am. x: 145. 1833. 

 Astragalus bisulcatus A. Gray, Pac. R. R. Rep. xa: 



Part 2, 42. pi. i. 1860. 



Rather stout, erect, nearly simple, i-3 high. 

 Stipules membranous, ovate-lanceolate, acute, 4"- 

 6" long; leaflets 17-27, oval or oblong, obtuse at 

 the apex, narrowed at the base, 8 // -i2 // long; flow- 

 ers deep purple, 7 // -8 / ' long, in elongated narrow 

 racemes; peduncles longer than the leaves; pod i- 

 celled, linear, stipitate, deflexed, pointed, glabrous 

 at maturity, membranous, with 2 deep furrows on 

 the upper side, 6 // -io // long. 



Nebraska and Colorado to Montana and the North- 

 west Territory. June-Aug. 

 i\ j 



12. Astragalus pectinatus (Hook.) Dougl. 



Narrow-leaved Milk Vetch. 



(Fig. 2136.) 



Phaca peclinata Hook. Fl. Bor. Am. i: 141. pl-54- 1830. 

 Astragalus fiec/ina/us Doug\.; Hook. Fl. Bor. Am. x: 

 142. As synonym. 1830. 



Ascending, much branched at the base or also 

 above, i-2 high, finely canescent or glabrate. 

 Stipules membranous, ovate-lanceolate, acute or 

 acuminate, 4 // -6 // long; leaflets 11-21, very nar- 

 rowly linear, acute, #'-3' long; peduncles shorter 

 than or exceeding the leaves; flowers yellow, 8' '-12" 

 long, in loose spikes or spike-like racemes; stand- 

 ard much longer than the wings and keel ; pod nearly 

 terete, i-celled, sessile, oblong, pointed, coriaceous, 

 glabrous, not furrowed, keeled along the upper 

 suture, 6"-%" long. 



Prairies, Nebraska and Colorado to the Northwest 

 Territory. June-Aug. 



