98 BOTANY OF LA SALLE COUNTY. 



ARCTIUM. B. Burdock. Heads covered with 



hooked bristles. 

 A. lap pa. Leaves large, ovate, woolly, clamnw ; 



1 to 4 ft. 



CNICUS. B. Thistle. Plants armed with sharp 

 prickles. 



C. altissimus. Downy, 3 to 10 ft., leaves toothed, 

 W., woolly. 



C. altissimus. var. discolor. Leaves lobed; 2 to 

 6ft. 



C. muticus. Tall, 3 to 8 ft; leaves W. -hairy be- 

 neath, lobed. 



C. pumilus. Short, stout, 1 to 2 ft., hairy, bear- 

 in"; 1 to 3 large heads; fragrant, a very pretty 

 thistle. 



C. arvensic. P. Canada Thistle. Slender, 1 to 



2 ft. leaves bright G. nearly smooth; smallish 

 with wavy, prickly margins; heads small, P. A 

 bad weed. 



KRIGIA. A. Dwarf Dandelion. Branched from 



base. 

 K. Virginica. Small, leaves mostly radical, scapes 



branching; flowers Or. /one-fifth in. broad; 1 to 



6 in. 

 K. amplexicaul is, M. Radical leaves winged- 



petiolate; of stem clasping, 1 to 3 smooth; heads 



Y. 1 in., broad, 1 to 2 'ft. J. Woods and fields. 

 HIERACIUM. R. Hawkweed. Hairy often clam- 

 my leaves. 

 H. Canaden se. Leaves sessile; lanceolate, acute, 



remotely and coarsely toothed; flowers Y. 1 to 3 



ft. Dry places. 

 H. longipilum. Hairy, leafy below, naked above. 



Peduncles glandular bristly. 2 to 3 ft. 

 PRENANTHES. P. Rattle Snake Root. Stems 



leafy, flowers G. W. or Y., P. tinged. Naba- 



lusof old Ed. 



