Genus 26, 



PEA FAMILY. 



?8i 



7. Astragalus racemosus Pursh. Race- 

 mose Milk Vetch. Fig. 2540. 



A. 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"-^' long ; 

 leaflets 17-21, elliptic or linear-oblong, acutish or 

 mucronate, io"-i5" long; peduncles equalling or 

 exceeding the leaves; flowers yellovkfish-white, 

 8"-9" long, in loose spike-like racemes ; pedicels 

 i"-2"long; pods linear-oblong, imperfectly 2-cellcd 

 by the intrusion of the dorsal suture, triangular 

 in section, acute at each end, glabrous, stipitate, 

 broadly sulcatc, pendent, about 1' long. 



Plains and hills. North Dakota to Missouri, Kan- 

 sas, Colorado and New Mexico. June-July. 



8. Astragalus Drummondii Dougl. Drum- 

 mond's Milk \'etch. Fig. 2541. 



Astragalus Drummondii Dougl. ; Hook. Fl. Bor. Am. 

 I : 153. 1833- 



Loosely woolly-pubescent, erect, i-2 high, 

 rather stout, growing in clumps. Stipules ovate, 

 long-acuminate, 3"-S" long; leaflets 19-33, oblong 

 or sometimes oblanceolate, obtuse at the apex, 

 narrowed at the base, 5"-io" long; flowers yel- 

 lowish-white or the keel purplish tinged, &"-g" 

 long, in loose spikes ; peduncles equalling or ex- 

 ceeding the leaves ; pod l-celled, the dorsal suture 

 somewhat intruded, distinctly stipitate, cartilagi- 

 nous, linear, pendent, glabrous, grooved, about 2' 

 long ; calyx somewhat enlarged at the- base, dark- 

 pubescent above. 



Hills, plains and valleys, South Dakota to Ne- 

 braska, Saskatchewan, Alberta and Colorado. June- 

 July. 



9. Astragalus Robbinsii (Oakes) A. Gray. Robbins' 

 Milk \'etch. Fig. 2542. 



Phaca Robbinsii Oakes. Hovey's Mag. Hort. 7: 179. 1841. 

 Astragalus Robbinsii A. Gray, Man. Ed. 2, 98. 1856. 



Glabrous or nearly so, erect, slender, branched at the base, 

 g'-iS' high. Stipules ovate-oblong, membranous, 2"-3" long; 

 leaflets 7-1 1, oblong, obtuse or slightly emarginate at the apex, 

 narrowed or rounded at the base, 4"-8" long ; flowers white, 

 i"-S" long in loose short or elongated racemes; pedicels i"-2" 

 long; pod flattened, l-celled. oblong, short-stipitate, rather 

 abruptly pointed at each end, membranous, finely blackish- 

 pubescent, dehiscent, nearly straight, not furrowed, or obso- 

 letely so, 9"-i2" long. 



Known only from rocky ledges of the Winooski River, Vermont : 

 station now obliterated, and the species extinct, unless inhabiting 

 some undiscovered locality. June-July. 



