LEGUMINOSiE. (PULSE FAMILY.) 69 



« ♦ Cushioned: flowers scarcelij exsertcd from among the simple leaves: pod many- 

 oviilcd, iiKirgined with rather strong sutures. 



60. A. simplicifolius, Gray. Leaves hoary with an appressed silky 

 pubescence, linear- or spatulate-lanceolate. crowding the extremities of the 

 usually short l)rauches: scapes 2 to .3-Howered : flowers purple, the keel 

 strongly arched: pod half-included in the calyx, glabrous. — Loc. cit. 231. 

 vSources of the Platte. W. Wyoming (Parn/). 



* * * Caulescent, ojlen depressed: Jlowers subsessi/e in the axils of the haves: 

 pods 3/0 ■i-oruled, usual! i/ l-seeded, ovate, sessile: leaves pinnate, with few 

 leaflets 



6L A. Kentrophyta, Gray. Intricately branched from a long root. 

 broadly dejnessed-ccspitosc, hoary with a short silky pubescence: leatlels 2 to 

 3 pairs, linear-subulate, usually rigid and divaricate, j)ungent : flowers 1 to 3, 

 ochroleucous or tinged with violet: pods compressed, j)ubescent, acuminate, 

 somewhat incurved. — Proc Acad. Philad. 1863, 60. From Montana and 

 Wyoming to New Mexico and westward into Nevada. 



B. Leaves apparentli/ palmateit/ 3-foliolate. 

 § 2L Pod conical-ovate, acuminate, not stipitate nor compressed, coriaceous, some- 

 what included in the calijx, neither suture intruded. — Perennial, cespitose from 

 a ninrh-branched icoody caudex, low, silver ij-silki/, with crowded leaves: leajlets 

 croivdrd. 



62. A. triphyllus, Pursh. Acaulescent, glossy silki/: stipules glabrous: 

 primary leaves sometimes 5-foliolate with cuneate oblanceolate leaflets, the 

 rest with 3 longer lanceolate leaflets, lotigpetioled, exceeding the sessile crowded 

 flowers : cali/xteeth half shorter than the tube : corolla ochroleucous or white : jx>d 

 villous, included. — From Nebraska to the Saskatchewan. 



63. A. tridactylicus, Gray. Resembling the last in habit and loave.s, 

 but stipules villous, flowers pale purple, cali/x-teeth equallinq the tube, jhuI jmberu- 

 lent, exposed bg the falling aivai/ofthe cali/x. — Proc. Am. .Vcad. vi. .')27. Moun- 

 tains of Colorado. 



64. A. sericoleuCUS, Gray. Very broadly cespitose, sUhphoorg : the 

 branches covered with villous stipules : leaves all 3-foli(date, not cfpialling the 2 

 to S flowered Jil if )rm peduncles: leaflets oblanceolate or cuneate oblong : cali/x- 

 teefh about equalling the tube : corolla purple : pod hoar//, indf included in the cali/T. 



— Am. Jour. Sci. ir. xxxiii. 410. From the sand-hill.s of N. Colorado to 

 \. Nebraska. 



14. OXYTROPIS, DC. 



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



— Mostly low perennials, with tufts of numerous very slu>rt stems from a hnnl 

 and thick root or rootstock, covered with scaly adnate stipules : pinnate leaves 

 of many leaflets : naked .scapes bearing a head or short spike of flowers. — 

 Rev. Oxyt., (Jray in Proc. Amer. Acad. xx. 



§ L Stipules free from the }wtiole and from each other : Icafg-.ttemmed or drjtau- 

 perate plants nearlg .'itemlrss. 

 L O. deflexa, DC. Loosely soft-pubescent or silky : taller forms over a 

 foot high: leaflets crowded in 12 to 16 pairs, lanceolate to oblong, J to ^ inch 



