94 BOTANY OF LA SALLE COUNTY. 



A. trifida. Tall, rough, grooved; leaves 3 to 7 

 lobed. 3 to 15 ft. 



A. artemisiae folia. Hog- weed, Rag- weed. Leaves 

 thin, cut into narrow lobes; stain, flowers Y. 

 in. long 1 , slender spikes. 1 to 5 ft. 



A. psilostachya. Leaves acute, lobed, roug-h, 



hoary. 1 to 3 ft.. Ottawa. 



XANTHIUM. A. Cockle Bur. Clot Bur. Ohio 

 Burdock. 



X. strumarium. A great nuisance. 

 HELIOP SIS. P. Oxeye. Erect, smooth, branch- 

 ing 1 plants. 



H. levis. Leaves opposite, petiolate, ovate- 

 lanceolate, serrate, smooth; flow r ers solitary. Y. 



1 to 4 ft. Aug-. 



H. Scabra. roug-hish; rays oblong-. 

 ECHINACEAE. Cone Flowers. Tall, roug-h, "stem 



almost leafless. 



E. purpurea. Leaves long- and narrow; heads 

 large, solitary, with long-, purplish, drooping- 

 rays. 

 RUDIBECKIA. Heads with brown conical discs and 



land, Or. Y. rays. 

 R. triboda. B. Very branching-, hairy, slender, 



2 to 5 ft.; leaves lobed or toothed; heads small. 

 R. subtomeltsa. Downy; leaves lanceolate, serrate. 



3 to 4 ft. 



R. hirta. B. Very roug-h-hairy; leaves entire; 

 rays 1 in. long-. 



R. specisca. Roug-hish, hairy, with upright 



branches. 



LEPACHYS. P. Tall, slender; rays pale Y. droop- 

 ing-, disc gray; 3 to 6 ft. 



L. pinnata. Hoary-hairy; leaves of 3 to 7 lance- 

 olate, acute leaflets. 



