LEGUMINOSAE TRIFOLIUM 



557 



denticulate; flowers in elongated, oblong or ovoid, heads, sessile; calyx hairy, 

 lobes plumose pointed, corolla crimson. 



Distribution. Used as a cover crop and a forage plant in the south 

 and east. Found on ballast from Maine to Pennsylvania. Native to Europe. 



Injurious properties. According to Prof. Coville it produces phytobezoars 

 and ocasionally causes death in animals. 



Trifolium re pens L. White Clover 



A smooth perennial with slender creeping and spreading stems ; leaflets 

 inversely heart-shaped or notched, obscurely toothed ; stipules narrow ; peduncles 

 very long, flowers in small loose heads reflexed when old; calyx shorter than 

 the white corolla ; pods 4-seeded. 



Distribution. In fields and waste places throughout eastern North America, 

 the Northwest and the Rocky Mountains. 



Poisonous properties. Said to cause tympanites in cattle and slobbering 

 in horses. 



Psoralea L. Psoralea 



Perennial herbs, usually sprinkled with glandular dots; leaves generally 

 3-5 foliolate; flowers spiked or racemed, white or mostly bluish-purple; calyx 

 5-cleft, persistent; stamens diadelphous or occasionally monadelphous ; pods 

 about as long as the calyx, 1-seeded. 



Fig. 307. White Clover (Trifolium 

 repens). Occasionally the cause of 

 tympanites in cattle. (L,amson-Scribner, 

 U. S. Dept. Agr.) 



