PAPILIONACEAE. 197 



8. TRTFOLIUM L. Clover. 

 Flowers yellow. 



Head 12-18 mm. long; stipules linear; leaflets all sessile. 



1. T. aureum. 

 Head 8-12 mm. long, nearly globose; stipules ovate; terminal leaflet 



stalked. 

 Head 20-40-flowered ; standard conspicuously striate. 



2. T. procumbens. 

 Head 3-20-flowered; standard scarcely striate. 3. T. dubium. 



Flowers red, purple, pink or white. 



Head or spike much longer than thick; calyx silky, its teeth plumose. 

 Corolla crimson, equalling or exceeding the calyx-teeth. 



4. T. incarnatum. 

 Corolla whitish, shorter than the calyx-teeth. 5. 7'. arvense. 

 Head globose, oval, or ovoid; calyx nearly glabrous. 



Flowers sessile, or very nearly so ; heads dense, ovoid, oval, or 



globose. 6. T. pratense. 



Flowers pedicelled; heads umbel-like, globose. 



Heads 2.5 cm. in diameter or more; peduncles 2-8 cm. long. 



7. T. reflexum. 

 Heads 12-18 mm. in diameter; lower peduncles 5-20 cm. long. 

 Ascending or procumbent ; flowers pink, pinkish or purple. 

 Ascending; calyx much shorter than the pink or 



nearly white corolla. 8. T. hybridum. 



Procumbent ; tufted ; calyx nearly equalling the purple 

 corolla. 9. T. Carolimanuin. 



Creeping; flowers white or pinkish. 10. T. repens. 



1. Trifolium aureum Poll. Yellow or Rop Clover. M. p. 539. Sandy 



fields and roadsides. Summer. 



2. Trifolium procumbens L. M. p. 540. Sandy fields and roadsides. 



Summer. 



3. Trifolium dubium Sibth. M. p. 540. Fields and waste places. Summer. 



Philadelphia— GhesinMt Hill (VP.). ^Mcfcs— Penn Valley (Cr.), TuUy- 

 town (Le.). Delaware— "Yinicwai (Fu.). 



Gloucester— MicMeioTX (He.), Timber Creek (Te.). Cape May—Peer- 

 mont (Br.), Tuckahoe (Ja.), WUdwood (Wn.). Atlantic— liammonton, 

 May's Landing (C). Ocean — Forked Eiver (Mac). Hunterdon— 'White 

 Hill (C). Mercer— Crosswick's Creek (Br.). 



New Castle— Frequent. 



4. Trifolium incarnatum L. Crimson or Italian Clover. M. p. 540. Cul- 



tivated and persisting. Summer. 



5. Trifolium arvense L. Eabbit-foot or St»ne Clover. M. p. 540. Old 



fields. Summer. 



6. Trifolium pratense L. Red Clover. M. p. 540. Fields and meadows. 



Summer. 



7. Trifolium refleum L. Buffalo Clover. M. p. 541. Meadows. Summer. 



Montgomery — Norristown (Me.). Chester — Phoenixville, /. 5wrA; (He.). 

 Mercer— Trenton (C). 



8. Trifolium hybridum L. Alsike Clover. M. p. 541. Meadows and 



waste places. Spring to fall. 



9. Trifolium Carolinianum Miehx. M. p. 541. Waste ground. Spring 



to fall. 

 Philadelphia— 'Navj Yard, Mart. (B. C). 



