LEGUMINOSAE (PEA FAMILY) 297 



4. Psoralea cuspidate Pursh, Fl. Am. Sept. 741. 1814. Canescent with 

 appressed pubescence: stipules subulate; leaflets obovate or elliptical-oblong, 

 pubescent: peduncles much longer than the leaves: calyx large, somewhat 

 inflated, gibbous at the base, conspicuously dotted, teeth triangular-lanceolate, 

 acuminate, the lower one produced : pod hid in the large calyx. From south- 

 eastern Colorado to Texas and Arkansas. 



5. Psoralea digitata Nutt. T. & G. Fl. N. A. 1: 300. 1838. Canescent, 

 diffusely branched: stipules lanceolate, reflexed; leaflets cuneate-oblong and 

 oblong-linear with an abrupt rigid point, smooth and minutely dotted above, 

 hirsute beneath: bracts obcordate or reniform: lobes of the calyx ovate: pod 

 hirsute, not wrinkled. Southeastern Colorado and southeastward along the 

 Red River into Arkansas. 



6. Psoralea argophylla Pursh, 1. c. 475. Silvery silky-white all over, diver- 

 gently branched: leaflets elliptical-lanceolate: lobes of the calyx and bracts 

 lanceolate: flowers in interrupted spikes: peduncles and lower tooth of the 

 calyx elongated. (P. campestris Nutt.) Colorado, far northward and east- 

 ward. 



7. Psoralea lanceolate Pursh, 1. c. Glabrous, or with a few scattered hairs: 

 stipules linear-lanceolate; leaflets linear to oblong-obovate, acute: peduncles 

 about equaling the leaves: calyx very small, its teeth short, obtuse, nearly 

 equal: ovary very silky: pod very glandular. Washington to northern Arizona 

 and eastward to the Saskatchewan and Nebraska. 



8. Psoralea tenuiflora Pursh, 1. c. Slender, much branched and bushy, 

 minutely hoary-pubescent when young: leaflets varying from -linear to 

 ob ovate-oblong : flowers in panicled racemes: lobes of the calyx and bracts 

 ovate, acute: pod glandular. (P. floribunda Nutt.) From Colorado to Mon- 

 tana and east to Illinois. 



9. Psoralea linearifolia T. & G. Fl. N. A. 1: 300. 1838. Tall and slender, 

 divaricately branched, slightly pubescent with appressed hairs: leaflets 3, 

 narrowly linear, elongated, mucronate, the upper surface dotted with black 

 glands, lower surface scarcely dotted, 5-7.5 cm. long and 2-4 mm. wide; 

 stipules minute, subulate, deciduous: racemes few-flowered, much longer 

 than the leaves: calyx-lobes and bracts lanceolate. From Wyoming to Texas. 



14. PAROSELA Cav. 



Glandular-punctate herbs or shrubs, with odd-pinnate (rarely palmate) 

 leaves, small entire leaflets, and flowers in terminal pedunculate spikes. Sta- 

 mens 9 or 10, monadelphous, the cleft tube of filaments bearing four of the 

 petals about its middle (the cordate standard being free). Pod ovate, flat, 

 usually indehiscent, 1- or 2-seeded, included in the calyx. Dalea. 



Glabrous; flowers not yellow. 



Leaflets 19-41 1. P. Dalea. 



Leaflets 9-13. 



Herbaceous . . . . . . . . . . 2. P. enneandra. 



Suffruticose 3. P. fonnosa. 



Pubescent; flowers yellow or fading purple. 

 Leaves trifoliolate. 



Corolla small, partly purple ' . . . 4. P. Jamesii. 



Corolla large, wholly yellow 5. P. Porten. 



Leaves pinnate. 



Silky-pubescent or glabrate. 



Stems simple 6. P. aurea. 



Stems repeatedly branched 7. P. rubescens. 



Canescently tomentose throughout 8. P. lanata. 



1. Parosela Dalea (L.) Brit. Mem. Torr. Club 5: 196. 1894. An erect 

 glabrous annual, 2-5 dm. high: leaflets 13-40: flowers light rose-color, in 

 cylindrical spikes; bracts conspicuous, ovate, pubescent, deciduous: calyx 

 very villous, with long slender teeth. From Colorado to southern Arizona and 

 eastward to Illinois. 



2. Parosela enneandra (Nutt.) Brit. 1. c. Glabrous, 4-10 dm. high: 

 branches slender and spreading: leaflets 9-13,, linear-oblong, 5-8 mm. long, 



