LEGUMINOSAE (PEA FAMILY) 291 



flowers white or ochroleucous, tinged with purple: stipe as long as the cam- 

 panulate calyx-tube: pod flattened or compressed, straight, margined by the 

 nerve-like sutures, reflexed, 8-12 mm. long, 2-4-seeded. A. multiflorus. (A. 

 grcdlator Wats. Zoe 3: 52. 1892; A. acerbus Sheld. 1. c. 123.) Very common 

 throughout our range and far northward and westward. 



63. Astragalus campestris (Xutt.) Gray, 1. c. 229. More or less pubescent, 

 somewhat tufted, branched from the base, 1-2 dm. high: stipules triangular- 

 acuminate, the lower membranous; leaflets 7-13, or the uppermost sometimes 

 simple, mostly linear, often somewhat rigid and subulate: peduncles few- 

 flowered, rather long and surpassing the leaves: calyx hirsute, some of the 

 hairs black ; its teeth short-subulate : corolla ochroleucous, tinged with purple : 

 pod flat, from linear-elliptic to oblong, pubescent. [ A . convallarius Greene; A. 

 decurrens (Rydb.), Bull. Torr. Bot. Club 31: 563. 1904; A.tenuifolius (Nutt.).] 

 Colorado to Montana and Idaho. 



64. Astragalus hylophilus (Rydb.) A. Nels. Very similar to the preced- 

 ing: leaves nearly erect; leaflets 15-23, lance-oblong or narrowly elliptic, 1-2 

 cm. long, glabrate: calyx-tube dark-strigose : corolla nearly white ; keel purplish- 

 tipped: pod linear-oblong, glabrous, more reflexed. (Homalobus hylophilus 

 Rydb. Mem. N. Y. Bot. Card. 1: 247. 1900.)- Colorado to Montana. 



65. Astragalus decumbens (Nutt.) Gray, Proc. Am. Acad. 6: 229. 1866. 

 Cinereous or silky-pubescent: stems diffuse or ascending, 1-2 dm. high: pet- 

 ioles sometimes somewhat flattened, mostly with 7-13 linear-lanceolate acute 

 leaflets: racemes 5-10-flowered : calyx-teeth attenuate, a little shorter than 

 the tube: corolla 8-10 mm. long, ochroleucous or purple; keel with a short, 

 inflexed tip: pod broad-linear, straight or falcate, 15-20 mm. long, hoary- 

 puberulent. (A. camporum Rydb. Bull. Torr. Bot. Club 32: 666. 1905.) 

 Colorado to British Columbia. 



66. Astragalus pauciflorus Hook. Fl. Bor. Am. 1 : 149. 1838. Cinereous- 

 pubescent, dwarf, from a woody caudex, matted-decumbent, with crowded 

 leaves: leaflets 7-11, oblong or lanceolate; the stipules all more or less con- 

 nate: peduncles 2-5-flowered : calyx-teeth very slender, exceeding the tube: 

 corolla violet: pod linear-oblong, silky-puberulent, 8-10 mm. long. (A.vexil- 

 liflexus Sheld.) In the mountains; Wyoming into British America. 



67. Astragalus diversifolius Gray, Proc. Am. Acad. 6: 230. 1866. Ashy- 

 strigillose; stems diffuse, decumbent, elongated, 2-4 dm. high: petioles short, 

 flattened ; leaves 1-5-f oliolate ; terminal leaflet or simple leaf linear, elongated, 

 2-5 cm. long, attenuated at each end: peduncle 1-5-flowered: calyx-teeth half 

 shorter than the tube: corolla ochroleucous or lurid, keel falcate-incurved: 

 pod oblong-linear, straight or sub falcate, 15-20 mm. long, canescent-puberulent. 

 A. junceus. (A. junciformis A. Nels. Bull. Torr. Bot. Club 26: 9. 1899.) 

 Arid and sterile slopes; Colorado to Idaho. 



68. Astragalus Wingatensis Wats. Proc. Am. Acad. 18: 192. 1883. Some- 

 what canescent, the pubescence appressed: stems several, 7-15 cm. high: 

 leaflets 9-13, narrow, glabrate: calyx short, with very short teeth: corolla 

 purplish, 6 mm. long: pod flat or compressed, sessile, subacute at apex, ob- 

 tuse or somewhat narrowed at base, glabrate or black-hairy. [A. dementis 

 (Rydb.), Bull. Torr. Bot. Club 31: 562. 1894.] New Mexico into Colorado. 



69. Astragalus Hallii Gray, Proc. Am. Acad. 6: 224. 1866. Subcinereous 

 or glabrate; stems rather stout, ascending: stipules subulate; leaflets 17-25, 

 oblong, subcuneate, retuse, 8-15 mm. long: peduncles exceeding the leaves; 

 flowers violet, 20 or more in a dense capitate raceme: calyx dark-pubescent, 

 broadly campanulate, gibbous at base; the broad teeth only one fourth as 

 long as the tube: pod oblong, inflated, glabrous, subcoriaceous, short-stipitate, 

 straight, 12-20 mm. long. Colorado. 



70. Astragalus flexuosus Dougl. Hook. Fl. Bor. Am. 1: 141. 1831. Ashy- 

 puberulent; stems ascending, 2-5 dm. high, flexuous: leaflets oblong or 

 cuneate-linear, obtuse or retuse: peduncles exceeding the leaves: racemes 

 mostly elongated, loose; flowers 8-10 mm. long, white or purplish: calyx 

 hoary-pubescent, teeth one third as long as the tube: pod cylindric. 18-25 mm. 

 long, puberulent, thinly coriaceous, straight or subincurved; stipe very short 



