362 



FABACEAE. 



Vol. II. 



4. Psoralea linearifolia T. & G. Narrow- 

 leaved Psoralea. Fig. 2494. 



Psoralea linearifolia T. & G. Fl. N. A. i : 300. 1838. 



Erect, i°-2° high, widely branching; stems not 

 always glandular, glabrous, or sparingly pubescent 

 with appressed hairs. Stipules ii"-34" long, lanceo- 

 late or setaceous; leaves sessile or short-petioled, 

 1-3-foliolate; leaflets 5"-is" long, i -2" wide, linear, 

 rugose, glandular, glabrous or with a few appressed 

 hairs; peduncles I'-g' long; flowers blue, loosely 

 scattered, 1-4 together on slender pedicels 2,"-^' 

 long; bracts i" long, ovate, acuminate; mature calyx 

 campanulate, 2" long, glandular, slightly pubescent ; 

 pod 4" long, narrowly ovoid or oblong, glandular, 

 with a short stout straightish beak ; seed flat, oblique, 

 dark brown. 



Prairies and hillsides, Nebraska and Colorado to 

 Texas. May-Aug. 



5. Psoralea collina Rydberg. Nebraska 

 Psoralea. Fig. 2495. 



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

 1893. 



Ascending or diffuse, somewhat grayish-pubes- 

 cent, i°-2° high. Stipules narrow, i"-4" long; 

 leaves 3-folioIate, or sometimes 5-f oliolate ; leaf- 

 lets obovate or oblanceolate, mucronate, mostly 

 glabrous above; bracts pointed, ii"-2" long; pe- 

 duncles slender, I '-4' 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 2l"-z" long, tipped with a 

 flat straight beak about li" long. 



Hillsides, western Nebraska. July-Aug. 



6. Psoralea digitata Nutt. Digitate Pso- 

 ralea. Fig. 2496. 



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, ii"-2" long; peduncles 

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

 leaves ; leaflets S, 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"-S" long, exceeding 

 the broad mucronate bracts; calyx-lobes acute; 

 pod ovoid, flattish, pubescent. 



Prairies and hills, South Dakota to Colorado, 

 Kansas and Texas. June-July. 



