Part 1, 1919] FABACEAE: PSORALEAE 21 



four lobes subulate, 8 mm. long, the lowest lanceolate, acute, slightly if at all longer; corolla 

 about 1.5 cm. long, similar to that of P. esculentum; pod hirsute, the body 4-5 mm. long, tipped 

 with a flat subulate beak, 12-15 mm. long; seed black. 



Type locality: Dallas County, Texas. 

 Distribution: Texas to Louisiana. 



9. Pediomelum hypogaeum (Nutt.) Rydberg. 



Psoralen hypogaea Nutt.; T. & G. Fl. N. Am. 1: 302. 1838. 

 Lotodes hypogaeum Kuntze, Rev. Gen. 194. 1891. 



A subacaulescent perennial, with an oblong-fusiform tuberous root 1-1.5 cm. thick, 2-5 

 cm. long; stem above ground nearly none; leaves digitately 5-foliolate, clustered at the base; 

 stipules membranous, ovate or lanceolate; petioles 3-10 cm. long, strigose with long appressed 

 hairs; leaflets 2-5 cm. long, 5-7 mm. wide, linear, linear-oblanceolate, or linear-oblong, acute, 

 glabrous or nearly so above, strigose beneath; peduncles usually short, from almost none to 

 3 cm. long; spikes very dense, 1-3 cm. long; bracts scarious, ovate, acute, hirsute, 5-8 mm. 

 long; calyx hirsute-strigose; tube 4 mm. long; upper four lobes subulate or lance-subulate, 

 6 mm. long, the lowest one ovate-lanceolate, 8-10 mm. long; corolla about 12 mm. long, similar 

 to that of P. esculentum; pod hirsute, the body ovoid, 5 mm. long, the beak flat, about 8 mm. 

 long; seed light-brown, wrinkled. 



Type locality: Plains of the Platte [Nebraska]. 



Distribution: Nebraska to Montana. Utah, New Mexico, and Oklahoma. 



Illustrations: Britt. & Brown, 111. Fl. /. 2097; ed. 2. /. 2500. 



10. Pediomelum scaposum (A. Gray) Rydberg, sp. nov. 



Psoralea hypogaea scaposa A. Gray, Bost. Jour. Nat. Hist. 4: 173. 1850. 



A subacaulescent perennial, with a globose tuberous root 1-2 cm. in diameter; stem above 

 ground nearly none; leaves digitately 5-foliolate, clustered at the base; stipules membranous, 

 lanceolate, 1 cm. long or less; petioles 5-8 cm. long, strigose; leaflets 1.5-3 cm. long, 4—6 mm. 

 wide, linear-oblanceolate to oblong-oblanceolate, long-strigose on both sides or glabrate above; 

 peduncles 3-6 cm. long, strigose; spikes dense, 1-2 cm. long; bracts scarious, ovate-lanceolate, 

 acuminate, hirsute, about 5 mm. long; calyx hirsute-strigose; tube 3 mm. long; upper four 

 calyx-lobes lance-subulate, 5 mm. long, the lowest one narrowly lanceolate, 7-8 mm. long; 

 corolla about 1 cm. long, similar to that of P. esculentum; pod hirsute, similar to that of the 

 preceding. 



Type locality: Hills on the Piedenales, near Fredericksburg, western Texas. 

 Distribution: Texas. 



11. Pediomelum californicum (S. Wats.) Rydberg. 



Psoralea californica S. Wats. Proc. Am. Acad. 12: 251. 1877. 

 Lotodes californicum Kuntze, Rev. Gen. 194. 1891. 

 Psoralea monlicola Greene, Erythea 3: 98. 1895. 



A perennial, with an enlarged fusiform or branched, farinaceous root; stem short, but with 

 the lower branches prostrate, elongate, 1-3 dm. long, strigose-canescent with scattered spread- 

 ing hairs; leaves digitately 5-foliolate; stipules lanceolate, 5-10 mm. long, acuminate; petioles 

 3-10 cm. long, strigose-hirsute with scattered spreading hairs; leaflets cuneate-obovate, 1-3 

 cm. long, rounded or retuse at the apex, strigose-canescent on both sides; peduncles of the main 

 stem 3-4 cm. long, those of the branches much shorter, with spreading or reflexed pubescence; 

 racemes dense, 2-4 cm. long; bracts narrowly lanceolate, 5-10 mm. long; pedicels 4-6 mm. long, 

 silky-hirsute; calyx long-silky; tube campanulate, 4 mm. long; lobes 5-6 mm. long, the upper 

 four linear- subulate, the lowest one linear-lanceolate; corolla about 12mm. long; banner almost 

 white, obovate, obtuse, with triangular basal lobes; wings and keel purple; pod ovoid, the 

 body 6 mm. long, the beak somewhat longer; seed dark-brown, smooth, somewhat mottled. 



Type locality: McGinnis Range, near the headwaters of Salinas River, California. 

 Distribution: California and northern Lower California. 



