leguminos.t:. (rui.sic family.) 120 



Leaves mostly 3- n-foliolntc. Flowers spiked or raccmca, white or mostly 

 bliKNpiirplish. Koot sometimes tuberous iind fiirinaecous. (Name, ^//wpuXt'of, 

 srnifij, iVoin the ,i;laiuls or dots.) 



* Lcaccs jtiiinahlij 3-foliolate. 



1. P. Onobrychis, Nutt. Nearly smooth and free from glands, erect 

 (3° -5° hiiili) ; Ixijlils lunceolate-ocale, taper-itoinUd (3' long) ; stijntlis and brads 

 awl-ahujtul ; raeemes elongated ; pcdiinele shorter than the leaves ; pods rough- 

 ene.l and wrinkled. — River-banks, Ohio to 111. and southward. July. 



2. P. stipul^ta, Torr. & Gray. Nearly smooth and glandless ; sieiiis dif- 

 fus ■ ; Irtilh'iti oniU'-dllptiml, retieulated ; stijmles acute ; Jluwers In heads on rather 

 short peduneles ; hrarls hroad/i/ ovate, shari>-pointc'd. — lloeks, Falls of the Ohio, 

 Kentueky. June, July. 



3. P. melilotoides, Michx. Somewhat pube.scent, more or less glan- 

 dular ; sirms erect (l°-2° high), slender; Itojlets lanceolate or mrrowli/ oblong; 

 s/jiL-cs oliloni), long-peduneled ; sti/mles awl-sha/jed ; braets ovate or lanceolate, 

 taper-pointed ; ])ods strongly wrinkled transversely. (Also F. eglandulosa. Ell.) 

 — Dry soil, Ohio to Illinois, Virginia, and southward. June. 



* * Leaves palmateh/ 3 — 5-folioliite. 

 ■i. P. floriblinda, Nutt. Slender, ereet, much branched and bushy (2° - 

 4° high), miiiiitcli/ lioaiy-pubescetit when young; leaflets varying from linear to 

 obovate-oblong (^'-1^' long), glandular-dotted; racemes panickd; lobes of the 

 calyx and bracts ovate, acute; pod glandular. — Prairies of Illinois and south- 

 westward. June - Sci)t. — Flowers 2" or 3" long. 



5. P. argoph^Ua, Pursh. Silvery silky-white all over, erect, divergently 

 branched (l°-3° high); leaflets elliptical-lanceolate; spikes inteirnpted ; lobes 

 of the calyx and bracts lanceolate. — High plains, N. Wisconsin, and westward. 

 June. — Flowers 4" - .')" long. 



6. P. eseul6nta, Pursh. Rowjhish hairy all over; stem stout (.">'- 15' 

 high) and erect from a tuberous or turnip-shaped farinaceous root; leaflets 5, 

 obovate- or lanceolate-oblong ; spikes oblong, dense, long-pednncled ; lobes of the 

 calyx and bracts lanceolate, nearly equalling the corolla (^' long). — High 

 plains, N. W. Wisconsin, Mr. Spears, T. J. Hale, &c., and westward. June. 

 The PoM.MK nL.vNCHE, or Pommii de Prairie, of the Voyageurs, 



8. DALE A, L. D.vlea. 



Calyx 5-cleft or toothed. Corolla imperfectly papilionaceous : petals all on 

 claws : the standard heart-shaped, inserted in the bottom of the calyx : the keel 

 and wings borne on the middle of the monadelphous sheath of fllaments, which 

 is cleft down one side. Stamens 10, rarely 9. Pod membranaceous, 1-sceded, 

 indehiscent, enclosed in the persistent calyx. — Mostly herbs, more or less glan- 

 dular-dotted with minute stipules; the small flowers in terminal spikes or heads. 

 (NauK'd fur Thninns Thde, an Fnglish botanist.) 



1. D. alopecuroides, Wllld. Erect annual (l°-2° hijih), glabrous, 

 except the dense and cylindrical silky-villous spike; leaves pinnate, of many 

 linear-oblong leaflets ; corolla whitish. — Alluvial soil, Illinois and southward. 

 July. (Numerous species occur farther southwest.) 



