VOL. II.] 



PEA FAMILY 



7. Psoralea collina Rydberg. Nebraska 

 Psoralea. (Fig. 2092.) 



Psoralea collina Rydberg, Fl. Neb. 21 : 54. /. 6, 7. 

 1895. 



Ascending or diffuse, somewhat grayish-pu- 

 bescent, i-2 high. Stipules narrow, i"-4" 

 long; leaves 3-foliolate, or sometimes 5-folio- 

 late; leaflets obovate or oblanceolate, mucro- 

 nate, mostly glabrous above; bracts pointed, 

 i)4"-2" long; peduncles slender, I'-tf long; 

 flowers about 3" long; calyx-segments linear- 

 lanceolate, much shorter than the ovate pod, 

 the lower one a little longer than the others; 

 pod 2} // -3 // long, tipped with a flat straight 

 beak about \Yz" long. 



Hillsides, western Nebraska. July-Aug. 



8. Psoralea digitata Nutt. Digitate 

 Psoralea. (Fig. 2093.) 



Psoralea digitata Nutt.; T. & G. Fl. N. A. i: 300. 

 1838. 



Canescent with appressed hairs, slender, erect, 

 widely branching, i-2 high. Petioles shorter 

 than or sometimes a very little exceeding the 

 leaves; stipules linear, i^ // -2 // long; peduncles 

 much elongated, often 3-5 times as long as the 

 leaves; leaflets 5, or of the upper leaves 3, digi- 

 tate, short-stalked, oblong-linear or oblanceo- 

 late, 9 // -i8 // long, 2 // -3 // wide, mostly obtuse or 

 mucronulate at the apex, narrowed or cuneate 

 at the base; inflorescence spicate, interrupted, 

 the blue flowers short-pedicelled or sessile in 

 clusters of 3-5; corolla 4 // -5 // long, exceeding 

 the broad mucronate bracts; calyx-lobes acute; 

 pod ovoid, flattish, pubescent. 



Prairies, South Dakota to Kansas and Texas. 

 June-July. 



9. Psoralea argophylla Pursh. Silver-leaf 

 Psoralea. (Fig. 2094.) 



Psoralea incana Nutt. Fraser Cat. Name only. 1813. 

 Psoralea argophylla Pursh, Fl. Am. Sept. 475. 1814. 



Erect, widely branched, densely silvery pubescent with 

 white appressed hairs throughout. Stem often zigzag, i- 

 3 high; petioles shorter than or equalling the leaves; 

 stipules narrowly linear, 3 // -4 // long; leaflets 3-5, digi- 

 tate, very short-stalked, oval, oblong or obovate, obtuse 

 and mucronate or acutish at the apex, narrowed or 

 rounded at the base, 8 // -i5 // long, 3 // -6 // wide; pedun- 

 cles exceeding the leaves; inflorescence spicate, inter- 

 rupted, the blue flowers sessile, about 4" long, in clusters 

 of 2-4; bracts lanceolate, slightly longer than the corolla, 

 persistent; calyx-lobes lanceolate; pod ovate, straight- 

 beaked. 



Prairies, Wisconsin and Minnesota to the Northwest Terri- 

 tory, south to Kansas and New Mexico. June-Aug. 



