DIADELPHIA.— DECANDRIA. 266 



447. TRIFOLIUM. Trefoil. Leguminosoz. 

 * Legumes 3 — ^-seeded. 



1. T. repens: heads umbellate ; legumes 4-seedecL 

 covered by the persistent corolla ; stem creep- 

 ing. 

 HAB. Meadows, &c. May— Oct. U. Stem 6— 

 12 in. long ; pet. very long ; fl. wh. 



Z. T. reflexum : decumbent, pubescent ; leaflets ob- 

 ovate ; stipules obliquely cordate ; heads many- 

 flowered ; flowers pedicellate, all at length re 

 flexed ; legumes mostly 4-seeded. 

 HAB. Rocky upland. "June. U. Very pubes. ; 

 fl. in large heads, red. 



** Legume \seeded. 



t Vexillum deciduous ; {Flowers not yellow.) 



3. T. pratense : heads dense, ovate ; lower tooth ot 

 the calyx shorter than the tube of the monopetal- 

 ous corolla ; leaflets oval, entire ; stem ascend- 

 ing. 



HAB. Meadows, &c. May— Oct. U. Stem 1— 2 

 ft. high ; fl. red, frag. §. 

 I. T. pennsyhanicum : ascending; stem much bran- 

 ched ; flexuous ; leaflets ovatp-elliptical, obtuse, 

 very entire ; stipules awned ; spikes ovate-cylindri- 

 cal, solitary, dense; lower tooth of the calyx shorter 

 than the monopetalous corolla. 



HAB. Woods and fields. June— Sept. U . Fl. red. 

 >. T. arvense : heads very hairy, oblong-cylindrical ; 

 teeth of the calyx setaceous, longer than the co 

 rolla; leaflets villous, nnrrow-obovate. 



HAB. Dry fields. June— Sept. 0. Stem 6— 12 

 in high ; fl. minute, wh. or pink. 



tt Vexillum persistent, scarious. {Flowers yellow. ) 



T. procumbens : heads oval, densely imbricate ; 

 vexillum sulcate, reflexcd ; stem procumbent 

 middle leaflet petiolate. 



