LEGUMINOSAE (PEA FAMILY) 289 



45. Astragalus jejunus Wats. King's Rep. 73. 1871. A low, many-stemmed 

 dwarf perennial, with short-branched woody caudex covered with imbri- 

 cated persistent stipules, usually sparsely and minutely hoary pubescent: 

 leaflets 9-15, linear to oblong, 3-5 mm. long: peduncles shorter than the 

 leaves, 2-3-flowered: calyx-teeth scarcely as long as the campanulate tube: 

 corolla ochroleucous: pod membranous, inflated, globose, sessile, glabrous, 

 wholly 1-celled, 8-10 mm. in diameter. Dry sterile hills and ridges; Wyoming 

 and Utah. 



46. Astragalus humillimus Gray, Proc. Am. Acad. 12: 57. 1877. Habit 

 of the last, but much more dwarf and condensed: sterns 2-3 cm. long, with 

 the scarious, coalescent stipules imbricated and petioles persistent and spi- 

 nescent: leaflets 7-11, oblong, canescent, with revolute margins: peduncles 

 1-3-flowered: corolla pale: pod ovate, 12-15 mm. long, coriaceous, with a 

 white pubescence. Often choked in drifting sand; Mesa Verde, southwest- 

 ern Colorado. 



47. Astragalus microcystis Gray, Proc. Am. Acad. 6: 220. 1866. A small 

 diffuse or procumbent ashy-pubescent perennial, with slender stems from a 

 woody root: leaflets 9-13, oblong-lanceolate, obtuse: racemes 5-12-flowered: 

 calyx pilose, the short teeth as long as the campanulate tube: corolla violet 

 or varying to white; the banner deeply emarginate: pod thin-membranous,, 

 ovate-globose, gray-pubescent, about 6 mm. long. From Wyoming to Wash- 

 ington. 



48. Astragalus leptaleus Gray, 1. c. Nearly glabrous; the slender stems 

 ascending: leaflets 13-23, lanceolate-linear to oblong, acute: peduncles shorter 

 than the leaves, 2-4-flowered: calyx blackish-pilose, campanulate: corolla 

 white; the banner emarginate; the keel purple-tipped: pod chartaceous, ovate 

 or oval, puberulent, 7-9 mm. long. (Phaca pauciflora Nutt.) Colorado and 

 Wyoming. 



49. Astragalus elatiocarpus Sheld. 1. c. 20. Caespitose and acaulescent, 

 more or less depressed, long-pubescent: leaves suberect, 5-13 cm. long; leaf- 

 lets 9-13, broadly lanceolate, acute or rarely obtuse, 10-18 mm. long; stipules 

 ovate, acuminate: raceme at first sessile, the peduncle elongating in fruit: 

 calyx campanulate, the tube shorter than the teeth: corolla yellow, the keel 

 inflexed: pod ovate-acuminate, incurved, woody, white with spreading hairs, 

 18-25 mm. long. Texas to Wyoming and Minnesota. 



50. Astragalus Iqtiflcrus Hook. Fl. Bor. Am. 1: 152. 1833. Very similar 

 to the preceding: leaves shorter: peduncles 6-8 cm. long, usually exceeding 

 the leaves, capitately 6-10-flowered : pod oblong-ovate, coriaceous, straight, 

 the dorsal suture impressed. Texas to Wyoming and Minnesota. 



51. Astragalus bisulcatus (Hook.) Gray, Pac. R. R. Rep. 12: 42. 1860. 

 Strigillose-puberulent: stems erect, often densely tufted in large clumps, 

 rather stout, 3-7 dm. high: stipules distinct; leaflets oblong, often narrow, 

 the lowest near the stem: flowers violet, in dense spike-like racemes, medium 

 sized, spreading or pendent; the keel nearly straight: calyx-teeth setaceous, 

 nearly as long as the campanulate tube: pod coriaceous, 10-12 mm. long, 

 shortly exsert-stipitate, oblong, semicylindric, the deeply concave ventral 

 surface divided by the salient obtuse suture. From Colorado to Nebraska 

 and far northward. 



52. Astragalus Haydenianus Gray, Proc. Am. Acad. 12: 1876. Smaller 

 than the preceding: pubescence more cinereous: spike elongated, virgate: 

 flowers much smaller: calyx-teeth much shorter than the tube: corolla white, 

 keel tinged with purple at the tip: pod rugulose with transverse veins; stipe 

 not exceeding the calyx. Wyoming and Colorado. 



53. Astragalus pectinatus Dougl. in Don. Gen. Syst. 2: 257. 1832. Pale 

 green and ashy-puberulent : stems ascending or spreading, 2-4 dm. high, 

 rather rigid, striate, and branched: leaflets 9-19, nearly filiform, seemingly 

 not articulated to the rachis, persistent; lower stipules connate: flowers 

 whit<> or yellowish, 20-25 mm. long, in a rather short raceme; the keel nearly 

 straight and the banner elongated: pod thick, cartilaginous, oblong, turgid, 

 sessile or short-stipitate, neither suture intruded but both thick and promi- 



ROCKY MT. EOT. 19 



