286 I;EGUMlNOSAE (PEA FAMILY) 



beneath, thinner, linear-lanceolate: pod lanceolate, subfaloate; the stipe 2-3 

 times longer than the calyx. — Same range as the last. 



21. Astragalus Macounii Rydb. Mem. N, Y. Bot. Gard. 1: 243. 1900, 

 Finely puberulent, rather slender, 3-5 dm. high: stipules free, ovate-lanceolate; 

 leaflets thin, 9-17, oblong or oval, obtuse, 15-25 mm. long: peduncle surpas- 

 sing the leaves; raceme 4-10 cm. long: calyx black-hairy, its linear-subulate 

 lobes very short: corolla ochroleucous, tinged with purple: pod membranous, 

 black-hairy, acute at both ends, neither suture sulcate but the dorsal with a 

 narrow inflexed edge. A. Bobbinsii occidentalis. — Colorado to Montana. 



22. Astragalus elegans (Hook.) Sheld. Bull. Geol. & Nat. Hist. Surv. 

 Minn. 9: 154. 1894. Subcinereous-puberulent: stems 3-5 dm. high, slender 

 and somewhat branched: leaflets 9-17, oval, oblong, or narrower; stipules 

 ovate, acute: flowers purple, 5-7 mm. long, in long spike-like secvmd racemes: 

 pod sessile, ellipsoid, 1-celled, pendent, slightly inflated, obtuse but apiculate, 

 4^6 mm. long, black-pubescent. A. oroboides americana. {A. Shearis Rydb. 

 Bull. Torr. Bot. Club 31 : 562. 1904.) — Frequent near mountain streams; from 

 Wyoming into British America. j, • 



23. Astragalus Brandegei Porter, Fl. Colo. 24. 1874. Ganesoent with 

 appressed hairs: stems several from a woody base, assurgent, 1-2 dm. high: 

 leaflets about 11, the pairs distant, linear, obtuse, involute, glabrous above, 

 10-15 mm. long: peduncles much longer than the leaves; flowers small, in a 

 loose raceme: calyx turbinate, hairy; the subulate teeth longer than the tube: 

 corolla white or yellowish, tinged with purple; the standard reflexed: pod 

 turgid, obovoid, with a shallow dorsal sulcus, short-stipitate and abruptly 

 short-pointed, 8-14 mm. long, hairy.— Colorado. 



24. Astragalus asclepiadoides Jones, Zoe 2: 238. 1891. Glabrous and 

 glaucous throughout: stems single or several from the woody root, 3-5 dm. 

 high: leaves simple, sessile, ovate-orbicular, cordate, often retuse, thick, 

 3-5 cm. long: racemes (spikes) axillary, 6-8-flowered: calyx cylindric, with 

 some scattered black hairs: corolla ochroleucous; the keel purple-tipped: 

 pod 1-celled, coriaceous, oblong-ovate, acute, stipitate. — Sandbars; Utah to 

 western Colorado. 



25. Astragalus Pattersonii Gray, Brand. Fl. S. W. Colo. 285. 1876. Gla- 

 brous or sparsely appressed-puberulent: stems stout, several from the crown, 

 nearly erect, often branched: leaflets oblong or cuneate-linear, obtuse or re- 

 tuse: racemes mostly elongated, loose: calyx narrowly campanulate, its lin- 

 ear recurved lobes shorter than the tube: corolla white, the keel sometimes 

 purplish-tipped: pod glabrous, elUptic-oblong, abruptly acute at apex and 

 contracted within the calyx, becoming somewhat stipe-like. — Southwestern 

 Colorado and Utah. 



26. Astragalus missouriensis Nutt. Gen. 2: 99. 1818. Short-caulescent, 

 hoary with a closely appressed silky-pubescence: leaflets 5-15, oblong, ellip- 

 tic or obovate: flowers few, capitate or spicate, 10-16 mm. long, violet: 

 calyx oblong, the teeth very slender: pod oblong, 2.5 cm. long, acute, ob- 

 tuse at base, pubescent, nearly straight, obcompressed or obcompressed- 

 triangular, depressed on the back and the ventral suture more or less promi- 

 nent, transversely rugulose. — Throughout our range, east on the plains and 

 south to Texas. 



27. Astragalus Shortianus Nutt. in T. & G. Fl. N. Am. 1: 331. 1838. 

 Usually subacaulescent, silky-canescent with a very closely appressed pu- 

 bescence: leaflets obovate or ovate, 12-18 mm. long: peduncles sCape-hke, 

 commonly shorter than the leaves: calyx 12 mm. long, cylindric, teeth shorter 

 than the tube: corolla violet or blue, rather large and showy: pod 3-5 cm. 

 long, ovate or ovate-lanceolate, thick, coriaceous, obcompressed, dorsal suture 

 intruded, approaching the ventral, transversely rugulose, pointed and strongly 

 arcuate, more or less pubescent. {A. cyaneus Gray, PI. Fendl. 34, 1854.) 

 — Wyoming to New Mexico. 



28. Astragalus chamaeluce Gray, Ives Rep. 10. 1861. Silvery-canescent, 

 with a dense silky-pubescence: stems numerous, short (2-5 cm.), prostrate 

 or nearly acaulescent : leafl ets 5-13, from oval to oblong, 4-S mm. long: pe' 



