38o 



FABACEAE. 



Vol. II. 



4. Astragalus Hypoglottis L. Purple Milk 

 Vetch or Cock's-head. Fig. 2537. 



Astragalus Hypoglottis L. Mant. 2: 274. 1771- 



Pubescent or glabrate, decumbent or ascending, 

 slender, branched at the base, 6-24' long. Stipules 

 ovate-lanceolate, acute, 2"-3" long; leaflets 17-25, 

 oblong or elliptic, obtusish and generally emarginate 

 at the apex, rounded at the base, 2"-7" long; flowers 

 violet-purple, 6"-io" long, in dense heads ; pods 

 membranous, sessile, 2-celled, dehiscent, densely vil- 

 lous with white hairs, ovoid-oblong, deeply furrowed 

 on the back, 4"-5" long. 



Kansas to Minnesota, north to Hudson Bay, west to 

 Alaska. Also in northern Europe and Asia. May-Aug. 



5. Astragalus bisulcatus (Hook.) A. Gray. 

 Two-grooved Milk Vetch. Fig. 2538. 



Phaca bisiilcata Hook. Fl. Bor. Am. i : 145. 1833. 



Astragalus bisulcatus A. Gray, Pac. R. R. Rep. 12 : Part 

 2, 42. pi. I. i860. 



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; flowers 

 deep purple, 7"-8" long, in elongated narrow racemes ; 

 peduncles longer than the leaves; pod i-celled, linear, 

 stipitate, deflexed, pointed, glabrous at maturity, mem- 

 branous, with 2 deep furrows on the upper side, 

 6"-io" long. 



Plains and river-valleys, Nebraska and Colorado to 

 Montana and Saskatchewan. June-Aug. 



6. Astragalus pectinatus (Hook.) Dougl. 

 Narrow-leaved Milk Vetch. Fig. 2539. 



Phaca pcctinata Hook. Fl. Bor. Am. i : 141. pi. ^4. 1830. 

 Astragalus pectinatus Dougl. ; Hook. Fl. Bor. Am. i : 

 142. As synonym. 1830. 



Ascending, much branched at the base or also 

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

 ules membranous, ovate-lanceolate, acute or acumi- 

 nate, 4"-6" long; leaflets 11-21, very narrowly linear, 

 acute, i'-3' long, persistent ; peduncles shorter than 

 or exceeding the leaves ; flowers yellow, 8"-i2" long, 

 in loose spikes or spike-like racemes ; standard much 

 longer than the wings and keel; pod nearly terete, 

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

 brous, dehiscent, not furrowed, keeled along the 

 upper suture, 6"-8" long, the exocarp somewhat 

 fleshy. 



Plains, Kansas, Nebraska and Colorado to Saskatch- 

 ewan and Alberta. June-Aug. 



