354 



FABACEAE. 



Vol. II. 



I. Trifolium agrarium L. "S'cllow or Hop- 

 cldvcr. J*"ig. 2474. 



Trifolium agrarium L. Sp. PI. 772. 1753. 



?7". aureum Poll. Hist. PI. Palat. 2: 344. 1777. 



Glabrous or slightly pubescent, annual, ascending, 

 branched, 6'-i8' high. Leaves petiolcd ; stipules linear- 

 lanceolate, acuminate, 4"-7" long, adnate to the pe- 

 tiole for about one-half its length ; leaflets all from 

 the same point, sessile, obovate or oblong, finely den- 

 ticulate, narrowed at the base, rounded, truncate or 

 emarginate at the apex, 6"-g" long; peduncles axil- 

 lary, -2' long ; head oblong, or oval, 6"-g" long, 

 densely many-flowered ; flowers yellow, 2"-3" long, 

 at length reflexed ; pedicels shorter than the calyx ; 

 standard slightly emarginate, exceeding the pod, con- 

 spicuously striate, and brown, especially when dry. 



Alonp: roadsides and in waste places, Nova Scotia to 

 South Carolina, west to Ontario, western New York and 

 Iowa. Naturalized from Europe. May-Sept. 



2. Trifolium procumbens L. Low, or Smaller 

 Hop-clover or Hop-trefoil. Fig. 2475. 



Trifolium procumbens L. Sp. PI. 772. 1753. 



Similar to the preceding species, but lower, more spread- 

 ing and more pubescent. Leaflets obovate, cuneate at the 

 base, rounded, truncate or emarginate at the apex, finely 

 denticulate, 4"-/" long, the lateral ones nearly sessile, the 

 terminal distinctly stalked ; stipules ovate, adnate to the 

 lower part of the petiole, about 2" long; peduncles 3"-i2" 

 long; heads 20-40-flowered, globose or short-oval. 4"-6" 

 in greatest diameter; flowers yellow, at length reflexed, 

 about 2" long; standard dilated, not folded, exceeding the 

 pod, striate and brown when dry. 



In fields and along roadsides. Nova Scotia to Ontario. Wash- 

 ington. Georgia and Mississippi. Naturalized from Europe. 

 May-Sept. 



3. Trifolium dubium Sibth. Least Hop- 

 clover or Hop-trefoil. Fig. 2476. 



Trifolium dubium Sibth. Fl. Oxon. 231. 1794. 

 Trifolium minus Smith. Engl. Bot. pi. 1256. 1799. 

 Trifolium procumbens var. minus Koch, FI. Germ. & 

 Helv. Ed. 2, 195. 1843. 



Straggling or ascending, nearly glabrous, stems 

 2'-2o' long, branching. Leaflets obovate, truncate 

 or emarginate at the apex, or even obcordate, 

 denticulate, cuneate at the base, the lateral ones 

 nearly sessile, the terminal stalked; stipules ovate 

 or lanceolate, adnate to the low-er part of the pe- 

 tiole ; peduncles 3"-i2" long; heads nearly glo- 

 bose, 2"-3" in diameter, 3-2o-flo\vered ; flowers 

 about li" long, turning brown, at length reflexed; 

 standard exceeding and folded over the pod, 

 scarcely striate. 



In fields and waste places. Massachusetts to New 

 Jersey. Arkansas. Geor.e:ia and Mississippi. .^Iso in 

 Washington, Oregon and British Columbia. Jamaica. 

 Naturalized from Europe. Summer. Said to be the 

 true Shamrock. Called also yellow-suckling. Wild 

 or yellow-trefoil. 



