354 



FABACEAE. 



VOL. II. 



i. Trifolium agrarium L. Yellow or Hop- 

 clover. Fig. 2474. 



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



?T. aureum Poll. Hist. PI. Palat. 2: 344. 1777. 



Glabrous or slightly pubescent, annual, ascending, 

 branched, 6'-i8' high. Leaves petioled ; 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"-p" long; peduncles axil- 

 lary, \'--2.' long; head oblong, or oval, 6"-o/' long, 

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

 at length reflexed ; pedicels shorter than the calyx ; 

 standard slightly emarginate, exceeding the pod, con- 

 spicuously striate, and brown, especially when dr$ 



Along roadsides and in waste places, Nova Scotia to 

 South Carolina, west to Ontario, western New York and 

 Iowa. Naturalized from Europe. M'ay-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"-7" 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"-! 2" 

 long; heads 2O-4O-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, Fl. 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 lower part of the pe- 

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

 bose, 2"-3" in diameter, 3-2O-flowered ; 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, Georgia and Mississippi. Also 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. 



