LEGUMINOSAE (PEA FAMILY) 283 



Leaves glabrate; pods glabrous . . . 64. A. hylophilus. 

 Leaflets linear to filiform, cinereous or silky; 

 pod broad-linear, hoary or silky pubescent. 

 Leaflets linear ...... 65. A. decumbens. 



Leaflets lance-oblong . . . . 66. A. pauciflorus. 



Plants taller (2-5 dm.), scarcely tufted. 



Stems rush-like; lateral leaflets linear, often 



wanting ....... 67. A. diversifolius. 



Stems leafy; leaflets oblong-linear . . . 68. A. Wingatensis. 

 Pods subterete; stipules distinct or nearly so. 



Calyx gibbous at base; leaflets oblong . . . 69. A. Hallii. 

 Calyx not gibbous at base. 



Stems ascending or spreading. 



Green; racemes elongated; pods 15-25 mm. long 70. A. flexuosus. 

 Cinereous; raceme subcapitate; pods 7-10 mm. 



long 71. A. Bodinii. 



Stems erect. 



Pods sessile . . . . . . . . 72. A. Fendleri. 



Pods large, exsert-stipitate ... 73. A. lonchocarpus. 



Low caespitose plants with palmately 3-foliolate leaves (OROPH- 

 ACA) 



Flowers ochroleucous 74. A. triphyllus. 



Flowers purple. 



Raceme sessile, shorter than the leaves 75. A. tridactylicus. 



Raceme short-peduncled, exceeding the leaves . . .76. A. sericoleucus. 



1. Astragalus succulentus Rich. Frank. Journ. 746. 1823. Stems prostrate- 

 spreading from the crown of a woody caudex, 1-3 dm. long, finely strigose: 

 leaflets green, 15-25, 10-15 mm. long, elliptic-oblong, obtuse: raceme short, 

 on a peduncle 3-10 cm. long: calyx slightly gibbous, somewhat dark-strigose 

 especially on the teeth: corolla ochroleucous, with purple-tipped keel, 20-35 

 mm. long; the narrow standard deeply notched at apex: pod 2-celled, fleshy, 

 indehiscent, plum-shaped and about 2 cm. long at maturity. A. caryocarpus 

 in part. (A. pnim'fer Rydb. Mem. N. Y. Bot, Card. 1: 239. 1900.) Plains 

 and foothills; Colorado to Canada. 



2. Astragalus crassicarpus Nutt. in Fras. Cat. 1: 1813. Size and habit of 

 the preceding, pale and minutely approssed-pubescent: leaflets narrowly 

 oblong: flowers in a short spike-like raceme: corolla violet-purple: pod gla- 

 brous, ovate-globular, more or less abruptly pointed, 20-25 mm. long, very 

 thick- walled, succulent but cellular or corky when dry. A. caryocarpus in 

 part. Colorado eastward on the plains and thence to Minnesota and Texas. 



3. Astragalus mollissimus Torr. Ann. Lye. N. Y. 2: 178. 1828. Stems 

 rather stout, mostly ascending from a decumbent base, the whole plant 

 densely silky-villous and tomentose: leaflets 17-29, ovate-oblong: spikes 

 dense, on elongated peduncles: calyx tubular: corolla violet, 12-20 mm. long: 

 pod glabrous, dry, coriaceous, dehiscent, narrowly oblong, obcompressed and 

 sulcate at both sutures, at length incurved, 10-18 mm. long. (A. anisus 

 Jones, Zoe 4: 34. 1894.) Wyoming and Nebraska to Kansas and New Mexico; 

 one of the several Loco weeds. 



4. Astragalus Bigelovii Gray, PI. Wright. 2: 42. 1853. Densely lanate- 

 villous throughout: stems stoutish, ascending, 1-3 dm. high: leaflets 15-25, 

 oval to obovate-oblong, 10-15 "mm. long: spike crowded, long-peduncled : 

 calyx-tube cylindrical, villous: corolla purple, 12-16 mm. long: pod turgid, 

 ovate, acute, not sulcate at the sutures, densely lanate. Colorado to New 

 Mexico and Texas. 



5. Astragalus carolinianus L. Sp. PL 756. 1853. A glabrate or puberu- 

 lent perennial: stems erect, 3-10 dm. high, often striate: leaflets 11-29, oval 

 to oblong, usually glabrous above and white-pubescent beneath: flowers 

 10-15 mm. long, becoming horizontal or reflexed: spikes long and dense, pe- 

 duncled: calyx cylindrical, with subulate teeth: corolla ochroleucous or green- 

 ish: pod oblong or elliptical, nearly erect, 10-15 mm. long, glabrous, 2-celled. 

 (A. oreophilus Rydb. Bull. Torr. Bot. Club 31: 561. 1904, and A. colora- 

 densis Rydb. seem to be merely variations of the widely disseminated A. 

 canadensis L., which may or may not be specifically distinct from A. carolini- 

 anus L.) 



5a. Astragalus carolinianus Mortonii Wats. King's Rep. 68. 1871. Usu- 



