LEGUMINOS^E. (PULSE FAMILY.) 57 



* * Flowers in interrupted spikes : peduncles and lower tooth of the calyx 



elongated. 



2. P. argophylla, Pursh. Silvery silky-white all over, divergently 

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

 From N. Wisconsin to the Saskatchewan and Upper Missouri, and in 

 Colorado. 



•1 P. eampestris, Nutt. Like the last but much less hirsute and silvery, 

 with short white appressed hairs, and more branching: stipules linear ; leaflets 

 linear or oblong-linear, rather obtuse, nearly glabrous above: bracts 3-flowered, 

 broadly ovate. — Plains of the Platte. 



4. P. digitata, Nutt. 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 rent- 

 form : lobes of the calyx ovate : pod hirsute, not wrinkled. — S. E. Colorado 

 and southeastward along the Red River into Arkansas. 



* * * Flowers in capitate or oblong dense spikes. 

 i- Root tuberous. 



5. P. esculonta, Pursh. Roughish-hairy all over : stem stout : leaflets obo- 

 vate or lanceolate-oblong : spikes oblong, long-ped uncled : lobes of the calyx and 

 bracts lanceolate. — High plains from the Saskatchewan to Louisiana and 

 Texas. 



ti. P. hypogsea, Nutt. Acaulescent : hirsute with whitish a;>/>ressed hairs ■. 

 Ii-aflets linear-lanceolate or linear-oblong, nearly glabrous above : spikes capi- 

 tate, on peduncles much shorter than the petioles: lobes of the calyx linear, 

 acuminate, the lowest lanceolate, elongated. — Sandy plains of N. Colorado 

 ( Greene), and along the Platte. 



+- h- Root not tuberous. 



7. P. laneeolata, Pursh. Glabrous, or with a few scattered hairs : stipules 

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

 ling the leaves : calyx very small, its teeth short, obtuse, nearly equal : ovary very 

 silky : pod very glandular. — Washington to N. Arizona and eastward to the 

 Saskatchewan and Nebraska. 



8. P. cuspidata, Pursh. 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 S. E. Colorado to Texas and Arkansas. 



7. DALEA, L. 



Calyx (in ours) deeply cleft, with plumose teeth. Standard cordate, its 

 claw free. Pod ovate, compressed, included in the calyx. — Leaflets small, 

 entire, sometimes stipellate. 



# Glabrous : flowers not yellow : leaflets 4 to 20 pairs, dotted. 



1. D. alopecuroides, Willd. Erect annual, 1 to 2 feet high : leaflets 

 10 to 20 pairs, linear-oblong : flowers light rose-color, in cylindrical spikes : bracts 



