334 NORTH AMERICAN FLORA [Volume 24 



Stipe 5-6 mm. long, a little shorter than or equaling the calyx-tube. 94. P. Preussii. 



Stipe 1-2 mm. long, less than half as long as the calyx-tube. 

 Leaflets broadly obovate; pod more than 2 cm. long. 

 Pod and leaflets glabrous. 



Pod obliquely ellipsoid, 7—8 mm. broad. 95. P. Davidsonii. 



Pod ovoid or broadly ellipsoid, more than 1 cm. broad. 96. P. laxijlora. 



Pod and lower surface of the leaves (at least when young) pubes- 

 cent. 97. P. Crolalariae. 

 Leaflets, at least of the upper leaves, linear or oblong; pod about 1.5 



cm. long. 98. P. Easlwoodiae . 



23. Neglectae 

 One species. 99. P. neglecta. 



1. Frigidae. Stipe of the pod long and slender, considerably exceeding the calyx, the 

 body considerably inflated, papery, abruptly narrowed at each end; corolla ochroleucous ; 

 calyx-lobes broadly triangular, broader than long. Perennial herbs with more or less pilose 

 thin foliage. 



1. Phaca americana (Hook.) Rydb.; Britt. & Brown, 111. Fl. 2: 304. 

 1897. 



Phaca frigida Richards, in Frankl. Journey 756. 1823. Not P. frigida L. 1753. 

 Phaca frigida americana Hook. Fl. Bor. Am. 1: 140. 1831. 

 Astragalus frigidus A. Gray, Proc. Am. Acad. 6: 219, in part. 1864. 

 Astragalus frigidus americanus S. Wats. Bibl. Ind. 193. 1878. 

 Astragalus alpinus americanus Sheldon, Minn. Bot. Stud. 1: 133. 1894. 

 Astragalus americanus M. E. Jones, Contr. W. Bot. 8: 8. 1898. 



Perennial, with a short branched woody caudex or rootstock; stems several, glabrous or 

 sparingly pilose, striate, straw-colored, 5- 1 2 dm. high ; lower leaves reduced to the mere stipules, 

 the rest 1-1.5 dm. long, ascending; stipules membranous, free, reflexed, yellowish-green, oblong, 

 1-2 cm. long; petioles 1-3 cm. long, as well as the rachis striate or nearly glabrous; leaflets 

 9-13, oblong, thin, acute at the base, mostly rounded at the apex, 2-6 cm. long, 0.7-2 cm. wide, 

 thin, glabrous above, sparingly pubescent beneath; peduncles 5-10 cm. long; racemes 2-4 cm. 

 long; bracts oblong, ciliate, 5 mm. long, reflexed, deciduous; calyx oblong-campanulate, about 

 5 mm. long, somewhat oblique, yellowish, glabrous except the ciliolate margin, the lobes very 

 short, broadly triangular, rather broader than long; corolla ochroleucous, about 15 mm. long; 

 banner obovate, retuse at the apex, moderately arched, with reflexed margins, gradually 

 tapering below; wings 12 mm. long, the blade oblong-lunate, obtuse, shorter than the long claw, 

 with an acute basal auricle; keel-petals similar, but broader, rounded at the apex, and with an 

 obtuse auricle; pod glabrous, very thin, yellowish, unspotted, the stipe 7-10 mm. long, the 

 body ellipsoid, acute at each end, 2-2.5 cm. long, 8-10 mm. wide and thick; seeds dark olive- 

 brown, obliquely round-ovate, 3 mm. long, 2 mm. wide, the scar near the middle of one side. 



Type locality: Rocky Mountains, in lat. 52° to 56°. 



Distribution: Wooded banks in the Rocky Mountains from Yukon to Wyoming, in the Black 

 Hills, South Dakota, and on Gasp£ Peninsula, Quebec. 



Illustrations: Britt. & Brown, 111. Fl./. 2148; ed. 2./. 2553; M. E. Jones. Rev. Astrag. pi. 27, 

 f. 90; Am. Jour. Bot. 16: pi. 44 A. 



2. Phaca littoralis (Hook.) Rydb. Bull. N. Y. Bot. Card. 2: 176. 

 1901 



Phaca frigida littoralis Hook. Fl. Bor. Am. 1: 140. 1831. 

 Astragalus frigidus littoralis S. Wats. Bibl. Ind. 193. 1878. 

 Astragalus alpinus littoralis Sheldon, Minn. Bot. Stud. 1: 133. 1894. 



Perennial, with a branched rootstock; stem more or less villous-pilose, 1-3 dm. high; 

 leaves 5-10 cm. long; stipules large, membranous, obliquely ovate, 1-1.5 cm. long, 4-6 mm. 

 wide, ciliate; petioles 0.5-2 cm. long, as well as the rachis sparingly pilose; leaflets 9-13, oval to 

 oblong, 1-2.5 cm. long, 4-8 mm. wide, rounded at the apex, glabrate above, villous-pilose 

 beneath, usually densely so; peduncles 4-7 cm. long, villous-pilose; racemes short; bracts broad, 

 oval or elliptic; calyx oblong-campanulate, 7-8 mm. long, black -villous; lobes 1 mm. long, 

 triangular; corolla ochroleucous, about 15 mm. long; petals as in P. americana but comparatively 



