622 FAB ACE A E 



5 Psoralea Reverchonii S. Wats. Foliage strigose, or glabrate below. Stems erect, 

 6-9 dm. tall, branching : stipules subulate : petioles shorter than the leaflets : leaflets 3-5, 

 the blades linear-oblong or linear-elliptic, 1.5-3.5 cm. long, acute at each end, glandular : 

 peduncles sometimes shorter tiian the subtending leaves, corymbosely branched : calyx 

 silky-strigose ; tube shorter than the narrowly lanceolate lobes : corolla fully 1 cm. long : 

 pods not seen. 



On rocky prairies, the Indian Territory and Texas. Spring and summer. 



6. Psoralea cuspidata Pursh. Foliage strigillose-canescent or glabrate below. 

 Stems erect, 4-6 dm. tall, branching : stipules subulate-lanceolate : leaflets 5, the blades 

 elliptic-oblanceolate to spatulate, 1.5-4 cm. long, glandular, usually apiculate : racemes as 

 long as the stout peduncles or shorter : calyx very glandular, somewhat accrescent; tube 

 gibbous on the upper side ; lobes oblong-lanceolate, longer than the tube, awn-tipped : 

 corolla 1.5-2 cm. long : pods enclosed in the calyx, about 8 mm. long, glabrous, each 

 tipped with a short recurved beak. 



On plains or prairies, Northwest Territory to Texas and New Mexico. Spring. 



7. Psoralea cyphocalyx A. Gray. Foliage strigillose. Koot perpendicular with a 

 globose thickening below the summit : stems erect, simple or sparingly branched, 4-9 dm. 

 tall, rather wand-like : stipules linear : petioles much shorter than the leaflets : leaflets 

 3-5, the blades linear to linear-oblanceolate, 1.5-10 cm. long, glandular, acute : peduncles 

 longer than the racemes : calyx densely strigose ; tube gibbous on the upper side ; lobes 

 lanceolate, shorter than the tube : corolla 1 cm. to nearly 1.5 cm. in length : pods not 

 seen. 



In sandy soil and on dry bluffs, Texas. Spring. 



8. Psoralea can6scens ]\Iichx. Foliage canescent. Root oval or fusiform : stems 

 erect, 3-9 dm. tall, widely branching : stipules subulate-lanceolate : leaflets 3, or 1 on the 

 upper leaves, the blades glandular, varying from obovate or oval to suborbicular, 1.5-6 cm. 

 long, usually rounded at the apex, attenuate into petiolules : peduncles as long as the sub- 

 btending leaves or twice as long : calyx glandular, accrescent ; tube gibbous on the upper 

 side ; lobes lanceolate or oblong-lanceolate, longer than the tube : corolla about 1 cm. long : 

 pods less than 1 cm. long, with an oval or ovoid body and a straight acute beak. 



In sand, North Carolina to Florida and Alabama. Spring. 



9. Psoralea hypoga^a Nutt. Foliage strigose. Root globose or fusiform : leaves 

 erect or spreading, with petioles much longer than the leaflets : stipules lanceolate or oblong- 

 lanceolate : leaflets 5-7, the blades linear to linear-oblanceolate, 1.5-4 cm. long, acute : 

 racemes subgloljose to oblong, nearly sessile or on peduncles overtopping the leaves : calyx 

 conspicuously pubescent ; tube campanulate ; lobes lanceolate, longer than the tube : 

 corolla about 1 cm. long : pods narrow, about 1 cm. long, each with a slender attenuate 

 beak. 



On prairies, Nebraska to Colorado, Texas and New Mexico. Spring and summer. 



10. Psoralea subacaiilis T. et G. Foliage hirsute. Root elongated fusiform : stem 

 subterranean : leaves with ascending or spreading petioles which are much longer than the 

 leaflets : stipules ovate-lanceolate : leaflets 5-7, the blades narrowly oblong, or oblong- 

 oblanceolate or obovate-oblong, 1.5-3 cm. long, usually obtuse : peduncles often surpassing 

 the leaves : racemes dense, shorter than the peduncles : calyx hairy ; tube campanulate ; 

 lobes ovate, or the lower one oblong-ovate, much longer than the rest : corolla blue, 

 l-1.5"cm. long: pods not seen. 



In rocky soil, Nashville, Tennessee. Spring. 



11. Psoralea escul6nta Pursh. Foliage hirsute. Root obovoid or fusiform :_ stems 

 erect or spreading, 0.5-3 dm. long, usually branching: leaves with petioles surpassing the 

 leaflets in length : stipules lanceolate to linear : leaflets 5, the blades oblong, oblanceolate, 

 or linear-elliptic or rarely cuneate, 2-5 cm. long, commonly apiculate : peduncles usually 

 about as long as the subtending leaves : racemes shorter than the peduncles : calyx 

 glandular ; tube gibljous on the top ; lobes lanceolate, about as long as the tube, except the 

 longer lower ones : corolla 1.5-2 cm. long : pods enclosed in the calyx, the obovoid body 

 shorter than the slender beak. 



On plains or prairies, Northwest Territory to Montana, Wisconsin, Texas and Louisiana. Spring 

 and summer. 



12. Psoralea virgata Nutt. Foliage strigillose, or glabrate below. Root fusiform or 

 obovoid : stems erect, 3-7 dm. tall, simple or sparingly branched : stipules subulate- 

 lanceolate : leaflets mostly 1, the blades glandular, linear or tiie lower ones oblong or 

 ovate-oblong, acutish, reticulated, much longer than the petiole : racemes 2-4 cm. long. 



