LEGUMlNOii^. (^PULtii: FAMILY.; 57 



* * Flowers in Interrupted apikes : peduncles and lower tooth of the caljx 



elomjated. 



2. P. argophylla, I'ursh. Silvery silkyirhite all over, divergentlj 

 branched : Imjiets elliptical-lanceolate: lobes of the calyx and bracts lance Jate. — 

 From N. Wiscousin to the ^Saskatchewan and r|ti)er Missijuri, and in 

 Colorado. 



3. P. campestriS, Nutt. Like the hist hut murh less hirsute and silvery, 

 with sliort white ;i]t])rosscd hairs, and more branching: stipulf^s linrar ; lenflttn 

 linear or ohlonii-lincur, ratlier ol)tuse, nearly qlabrons alnjve : bracts 3-flowere<l, 

 broadly ovate. — Phiins of the Platte. 



4. P. digitata, Nutt. Cane.scent, diffusely branched : stipules lanceolate, 

 reflexed ; Im/lcls runeate-oblong and ohloiiff-lincar u-ith an abrupt riffid j>oint, 

 smooth and minutely dotted above, hirsute beneath: braris oltcurdntt- or teui- 

 form : lobes of tlie calyx ovate: ])()d hirsute, not wrinkled. — S. E. Colorado 

 and southeastward along tlie Red River into Arkansas. 



* * * Flou-ers in capitate or oUony dense spikes. 

 •♦- Root tuberous. 



5. P. esculenta, Pursh. Rough ish-hain/ all over: stem stout : leaflets olx>- 

 vate or l(inc( o'.iite-oblourj : spikes oblonrj, lonf/-pedunclfd : lobes of the calvx and 

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

 Texas. 



6. P. hypogaea, Nutt. Acauhscent: hirsute loith whitish appressed hairs-, 

 leaflets linear-lanceolate or linear-oblong, nearly glabrous above : spikes cupi 

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

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

 {Greene), and along the Platte. 



-t- -»- Root not tuberous. 



7. P. lanceolata, Pursh. Glabrous, or with a few scattered hairs : .<!tipulei 

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

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

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

 Saskatchewan and Nebraska. 



8. P. CUSpidata, Pur.sh. Canescent ivith 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 prodnod : pod hid in 

 the large calyx. — From S. E. Colorado to Texas and Arkausivs. 



7. DALEA, L. 



Calyx (in ours) deeply cleft, witli phimose teeth. Standard cordate, its 

 claw free. Pod ovate, compressed, ineluded in the calyx. — Leaflets nmall, 

 entire, sometimes stij)elhate. 



* Glabrous : flnirfrs not yellow: lea flrts 4 to 20 pairs, dotted. 



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

 10 to -20 pairs, linear-oblong : jlowers light rose-color, in cylindrical spikrs: bnict* 



