292 LEGUMINOSAE (PEA FAMILY) 



but evident. (A. proximus and A. salidae Rydb. Bull. Ton*. Bot. Club 32: 667. 

 1905.) Common at middle elevations; Colorado and Nebraska to Manitoba. 



71. Astragalus Bodinii Sheld. 1. c. 122. Subglabrous slender perennial: 

 stems ascending or prostrate, 3-7 dm. long, branched, striate: leaflets 11-17, 

 narrowly obovate to lanceolate, abruptly acute, 7-12 mm. long; stipules 

 ovate-acuminate: peduncles 6-7 cm. long, dark-strigillose, rather few-flowered : 

 calyx campanulate, purplish, and nigrescent: corolla purple, 8-10 mm. long: 

 pod short-stipitate, chartaceous, oblong, flat, 1-celled and often only 1-seeded. 

 Wet low meadow lands; Colorado and Wyoming. 



72. Astragalus Fendleri Gray, PI. Wright. 2: 44. 1853. An erect peren- 

 nial, 2-4 dm. high, glabrous or appressed-pubescent : leaflets oblong or linear- 

 oblong: racemes long-peduncled, loosely flowered; flowers purple: pod oblong, 

 inflated, chartaceous-coriaceous, about 20 mm. long, straight, pointed, mi- 

 nutely puberulent, the stipe very short or wholly wanting. Colorado to New 

 Mexico. 



73. Astragalus lonchocarpus Torr. Pac. R. R. Rep. 4: 80. 1857. Ashy- 

 puberulent or glabrate perennial: stem fistulous, sulcate, branched, 5-7 dm. 

 long: stipules distinct, small; leaflets 1-5, linear or filiform-linear, remote, the 

 leaf sometimes reduced to the flattened filiform rachis: racemes loosely 

 many-flowered, on long, strict, stoutish peduncles; bracts one half shorter 

 than the pedicels; flowers white, pendent: calyx-teeth broad-subulate, much 

 shorter than the tube: pod membranous, lanceolate-cylindrical, straight, 

 3-4 cm. long, very sharply acuminate at each end, exsert-stipitate, glabrous, 

 neither suture intruded. (Phaca macrocarpa Gray, PI. Fendl. 36. 1849.) 

 Colorado. 



74. Astragalus triphyllus Pursh, Fl. Am. Sept. 2: 740. 1814. A caespitose 

 perennial, from a much branched woody caudex, with crowded leaves, silvery 

 and glossy silky: stipules glabrous; primary leaves sometimes 5-foliolate with 

 cuneate oblanceolate leaflets, the rest with three longer lanceolate leaflets, 

 long-petioled, exceeding the sessile crowded flowers: calyx-teeth half shorter 

 than the tube: corolla ochroleucpus or white: pod villous, included, conical- 

 ovate, acuminate, somewhat coriaceous. (A. gilviflorus Sheld.; Phaca caes- 

 pitosa Nutt.) From Nebraska and Wyoming to the Saskatchewan. 



75. Astragalus tridactylicus Gray, Proc. Am. Acad. 6: 527. 1866. Peren- 

 nial, caespitose from a short woody caudex, dwarf, 5-8 cm. high, silvery- 

 silky: leaves pinnately 3-foliolate, long-petioled, exceeding the sessile crowded 

 flowers; leaflets oblanceolate, 10-12 mm. long, acute: flowers 1 cm. long, pale- 

 purple: calyx-teeth equaling the tube: pod globose, ovoid, 5-8 mm. long, very 

 turgid, puberulent, 12-ovuled, 3-4-seeded: calyx deciduous, exposing the 

 pod. Colorado and Wyoming. 



76. Astragalus sericoleucus Gray, 1. c. 232. Very broadly caespitose, 

 silky-hoary; stems branched, prostrate; branches covered with the villous 

 stipules: leaves all 3-foliolate, not equaling the 2-6-flowered filiform peduncles; 

 leaflets 6 mm. long, oblanceolate or cuneate-oblong: calyx-teeth about equal- 

 ing the campanulate tube: corolla purple, 6-8 mm. long: pod ovate-oblong, 

 6 mm. long, hoary, half included in the calyx. Colorado to Dakota and 

 Nebraska. 



10. ARAGALLUS Neck. Loco 



Like Astragalus, but distinguished by a subulate beak at the tip of the keel. 

 Mostly low perennials, witfy tufts of numerous very short stems from a hard 

 and thick root or rootstock, covered with scaly adnate stipules. Leaves pin- 

 nate, of many leaflets. Scapes naked, bearing a head or short spike of flowers. 

 Oxytropis. 



Stipules free; pod 1-celled 1. A deflexus. 



Stipules adnate to the petiole. 

 Pod included in the calyx. 



Calyx bladdery-inflated, not distended by the pod. 



Plants dwarf and caespitose; flowers purple . . . 2. A. multiceps. 



Plants 1-2 dm. high; flowers ochroleucous . . . 3. A. collinus. 



