398 FABACEAE 



Very rare as a fugitive weed near Brooklyn, N. Y., and perhaps 

 elsewhere. 



M. muricata All., M. minima L., and M. pubescens DC. have been collected as 

 waifs near the larger cities. 



7. Trifolium [Tourn.] L. 



Flowers yellow. 



Head 12-18 mm. long; stipules linear; leaflets all sessile. 1. T. agrarium. 



Head 8-12 mm. in diameter, nearly globose; terminal leaflet 

 stalked. 

 Heads 20-40-flowered. 2. T. procumbens. 



Heads 3-20-flowered. 3. T. dubium. 



Flowers red, purple, pink or white. 

 Inflorescence longer than thick. 



Corolla crimson, equalling or exceeding the calyx teeth. 4. T. incarnatnm. 

 Corolla whitish, shorter than the calyx teeth. 5. T, arvense. 



Inflorescence not longer than thick; globose, ovoid or oval. 



Flowers sessile or nearly so; heads dense. 6. T. pralense. 



Flowers pedicelled; heads umbel like, loose. 



Heads 2.5 cm. in diameter or more; pubescent. 7. T. reflexum. 



Heads 12-18 mm. in diameter. 



Ascending or procumbent; flowers pink, pink- 

 ish or purple. 

 Ascending; calyx shorter than the corolla. 8. T.hybridum. 

 Procumbent; calyx nearly equalling the 



corolla. 9 T. caroliniatium. 



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



1. T. agrarium L. (T. aureum Poll.). Along roadsides and in 



waste places: U. S. to Va., Ont. and Iowa. Naturalized from 

 Europe. 

 Common as a weed throughout our area. 



2. T. procumbens L. In fields and along roadsides: E. N. Am. 



Naturalized from Europe. 

 Throughout the range, not very common. 



3. T. dubium Sibth. In fields and waste places: N. Eng., N. J. 



and in the Southern States. Naturalized from Europe. 

 Rare as a weed. 



4. T. incarnatum L. In fields and waste places and on ballast: 



Me. to N. Y., N. J. and Pa. Naturalized from Europe. 

 Not common near the larger cities as a weed. 



5. T. arvense L. In fields and waste places: Throughout E. N. 



Am. Naturalized from Europe. 



Common everywhere, especially in fields. 



