72 MONTANA AGRICULTURAL COLLEGE SCIENCE STUDIES. 



Astragalus adsurgens pauperculus, n. var. 



15 cm. high of less, spike 1-2 cm. long, flowers about 12 mm. and 

 legume about 6 mm. long. This is the other extreme from variety 

 robustior, Hook., much smaller than the normal form in hight, leaf, 

 ^flower and fruit. On dry, gravelly ridges. 



Billings, July 7, 1902; Garfield Peak, Wyo., July 24, 1894, A. Nel- 

 "Son, 646. Intermediate forms have been found at Bozeman and 

 Big Timber. 



Astragalus adsurgens robustior, Hook. This ranker, nearly 

 erect form with less nigrescent calyx is not rare in the plains east- 

 ward. 



Melville, July 21, 1901. 



Astragalus amphidoxus, n. sp. 



Perennial, caespitose /rom a long, thic-< taproot: branches oS- 

 cending, 12-18 cm. long, sparsely hirsute, slender: stipules broadly 

 ovate or triangular acute, connate below; leaves 5-8 cm. long includ- 

 ing the petiole of one-third that length ; leaflets 6-8 pairs, ovate ob- 

 long to linear, acute, thin, nearly sessile, the younger often revolute in 

 drying, 1-2 cm. long, 2-4 mm. wide : inflorescence 6-8 flowered in a 

 lax raceme, about equaling the leaves; peduncles long (3-6 cm.): 

 bracts 2 mm. long, linear to lanceolate : calyx pubescent with some 

 short, black hairs, teeth linear, about equaling the tube ; corolla violet, 

 8 mm. long; similar to the larger flowered forms of vexiliflexus which 

 it resembles in habit and with which it appears to intergrade :. le- 

 gume flat, straight, sessile, about 3-seeded, 5-8 mra. long, somewhat 

 oblique. 



Near A. miser, Dougl. (Hooker, Fl. Bor. Am. 1:153 note), but it 

 is yet doubtful just what this species is. Nuttall's description (Tor 1 

 rev & Gray, Fl. N. Am. 1 : 338) differs from Douglas's in the obovate 

 leaflets and Gray (Proc. Am. Acad. 6:228) describes it as cinereous 

 pubescent (like A. vexiHiflc.rus, Sheld.), instead of subpubescent 

 (Douglas) or somewhat hirsute (Nuttall) and 'the leaves, as with 

 Douglas, as broad-linear to oblong and obtuse, not obovate and acute, 

 as with Nuttall. Watson (King's Rep. 5:444) and Howell (Flora 

 N. W. Am. 153) follow Gray in their description of the species. 

 A..amphido.Tits differs from A. miser, Dougl. in having more leaflets 

 (6-8 instead of 5-6) ; and sparsely hirsute instead of cinereous pube- 

 cence; from Nuttall's in its oval-oblong to linear, acute leaves (not 

 obovate) and from Gray's in being hirsute pubescent, instead of cin- 

 ereous pu'bescent, and the peduncles not exceeding the leaves. In 



