101 
II. PSORALEA ARGOPHYLLA Pursh. 
Psoralea argophylla Pursh, Fl. Am. Sept., 475 (1814). Type 
in Herb. Acad. Phila, 
Psoralea incana Nutt. Fras. Cat. (1813), name only. Type in 
Herb. Acad. Phila. : 
Psoralea argophylla var. decumbens, A. Gray, Pac. R. R. Rep. 
12: 41 (1860). cas 
Rocts thickened, rhizome often 30 cm. or more long, stems erect, 
3-5 dm. or more high, branching, silvery canescent throughout; stip- 
ules 4-1 cm. or more long; petioles as long or somewhat longer 
than the leaflets ; leaves 5-foliolate; leaflets 114-4 cm. long, 6 mm. 
—2 cm. broad, oblong, or oblong-cuneate, obtuse or sometimes mu- 
cronulate, more or less canescent with silky white hairs on both 
Surfaces, with a few scattered small black glands; peduncles much 
longer than the leaves ; flowers two or three together in an inter- 
rupted raceme or spike; bracts ovate-lanceolate, acute 5-8 mm. 
long ; calyx-lobes acuminate, the lower one over I cm. long and 
Onger than the ovate straight beaked pod; seed flat, 4 mm. 
Ong, brownish. 
North West Terr.—Moose Mt., Macoun (1880); Souris Plain (As- 
siniboia), Macoun (1887); Saskatchawan, Bourgeau (1857-8) ; 
Saskatchawan Plains, Macoun, No. 416; St. Peter's, Parry; 
Nicollet. 
Montana Elliott Coues (1874); Stendive, L. F. Ward (1883). 
Dakota—Black Hills, W. H. Forwood; Glatfelter. | 
Minnesota—_Dr. Sykes (1849); Upper Missouri River, Parry (1848) ; 
St. Anthony Falls, Torrey ; Falls of St. Anthony, Dr. Hough- 
ton, No. 63; St. Anthony, T. J. Hale (1861); St. Peter’s River 
Hall (1861); Fort Snelling, Hall (1861); Minnehaha, H. H. 
Babcock (1872); Winnebago City, H. W. Babcock (1871); 
Minneapolis, Sandberg, No. 278 (1891) ; Hennepin Co., Sand- 
berg (1890) ; Fort Snelling, Mearns, No. 244 (1890). © 
Wisconsin St. Croix, T. J. Hale (1861). : 
owa—C. C. Parry (1847); A. Commons; Emmet Co. R. J. 
Cratty ; Ames, A. S. Hitchcock. ‘ 
Nebraska__F Vi Hayden (1853); Fort Kearney, H. Engelmann - 
(1858_9), Big Nemahah River to Fort Kearney, F nage a 
(1849) ; Ogalalla, Earle (1880) ; Fort Niobrara, Fisher (1889) 
