Astragalus. LEGUMINOSiE. 335 



the base, with a short abrupt point. Seeds somewhat truncate. — In Dr. Lea- 

 venworth's and in Uriuniiioiid's specimens the legumes are strai^hlcr, loiigir, 

 and less tumid than in Mr. Nuttull's; but in otlier rtspccls they agree ex- 

 tremely well. 



§ 2. Stipules not cohering trith the petiole: flov-ers ochroleucous. — 



Ochroleuci, DC. 



* Stijniles not cohering with each other : legumes often curved: root arinual. 



28. A. muliicaitlis (Nun.\ mss.): "canescent ; stems much branched from 

 the base and cffspitose ; leaflets 3-6 pairs, mostly obovate, obtuse ; stipules 

 ovate, membranaceous; racemes 3-5-tiowered, shorter than the leaves ; biaots 

 subulate; calyx campanulate; the teeth broadly subulate, as long as the tube; 

 legumes oblong, very hairy, much curved, intlated, acute, partly 2-ceUcd, the 

 upper suture sulcate. 



" Dry sterile hills near Ham's Fork of the Colorado of the West. June. — 

 Apparently biennial. [4 ?] Stems about four or five inches high, intricately 

 ■branched, the lower part usually buried in the sand. Leaflets 3-4 lines long. 

 Flowers nearly white, Avith a tinge of dull purple." A'n^L— Perhaps not refer- 

 red to its proper station in the genus. The flowers are apparently ochroleucous ; 

 but the root seems to be perennial. 



♦ • Stipules coheiiiig with each other. 



29. A. Oreganus (Nutt. ! mss.): "dwarf and decumbent, canescent 

 with ajipressed hairs; leaflets 17-21, broadly obovate or obcordate ; stipules 

 membranaceous; peduncle terminal, very f:hort ; ^])ike somewhat capitate; 

 bracts linear, more than half the length of the blackish villous calyx ; teeth of 

 the calyx about one-third the length of the tube. 



" Plains of the Rocky Mountain ran.re towards the sources of the Oregon. 

 Several stems from one root, about fi inches long, scarcely branched. Flow- 

 ers as large as in A. Canadensis. Legumes not seen." Nuttall. 



30. A. flavus (Nutt.! mss.) : " somewhat canescent Aviih appressed hairs, 

 diffusely branched and decumbent; leaflets 2-5 pairs, oblong, or lanceolate- 

 linear, rather acute, nearly glabrous above ; stipules united opposite the leaves ; 

 peduncles longer than the leaves ; spikes at length elongated and loose ; ca- 

 lyx campanulate; the teeth subulate, nearly as long as the tube; legumes 

 mostly included in the calyx, oblong-ovate, much compressed contrary to the 

 sutures, with a broad and rather deep furrow below, partly 2-celled." 



Hill-s of the central chain of the Rocky Mountains, towards the Oregon. 

 Nuttall! — Steins 6-8 inches long, rather slender. Spikes 10-15-flowered ; 

 the flowers rather bright yellow. Legumes about one-third of an inch loiig ; 

 the sutures closely approximated ; the upper one a little prominent, forming 

 a ridge along a broad shallow depression. 



♦ • Stipules not cohering tcith each other: spikes pedunculate : legumes sessile: root 

 perennial. 



31. A. Canadensis (Linn.) : tall and erect, canescent ; stipules broadly 

 lanceolate, acuminate, leaflets usually about 10 (rarely 12-14) pairs, elliptical 

 or oblong, obtuse ; peduncles about as long as the leaves ; spikes oblong or 

 elongated; bracts subulate, nearly as long as the calyx; flowers spreading, 

 and partly reflexcd ; legumes ovate-oblong, terete, erect, coriaceous, gla- 

 brim=;, 2-celled, manv-seeded; the upper suture prominent and acute. — Willd. 

 sp. 3. p. 1274; Pursh, Ji. 2. p. 472; Ell. sk. 2. p. 227; Hook. f. Bor.- 

 Am. l.p. 152. A. Carohnianus, Linn. ; Michx. ! fl. 2. p. 66 ; Pursh, I. c. ; 

 Ell. I. c. 



