62 
521. A. artemisiSBfolia, L. Roman Wormwood. Hog-weed. Bitter- 
a (o weed. Rag-weed. 
In waste places ; abundant. July 25th — September. 
Variable. 
522. A. psilostachya, D C. Western Rag weed. 
Moist prairies ; infrequent. (B.) 
Brighton. Hawthorn. Austin. Near Waldheim. Desplaines, 
University of Chicago Herb. 
XANTHIUM, Tourn. 
523. X. spinosum, L. Spiny Clotbur. 
Chicago, Vasey, — in Plants of Illinois. (B.) 
524. X. strum aeium, L. Cocklebur. Clotbur. 
Barn -yards and cultivated grounds; infrequent. August. 
525. X. canadense, Mill. Cocklebur. 
X. strumarium, in part, in Manual, 5th Ed. 
Banks of streams and lakes, chiefly in alluveal soil; frequent. 
August — September 15th. 
A form without pubescence between the prickles is occasionally found. 
526. X. canadense, Mill., var. echinatum, Gray. 
X. strumarium , L., var. echinatum, Gray. 
Sandy soil near the lake shore, Evanston ; rare. August. 
Whiting, Indiana. 
ECLIPTA, L. 
527. E. alba, Hassk. 
E. procumbens , Michx. 
Banks of the Calumet river, near L. S. & M. S. R. R. bridge; rare. 
July. Observed during the seasons of 1882-’88-’85-’87. 
In 1887, a few specimens were found bearing yellowish anthers. 
The plants had disappeared from this locality in 1889. (B.) 
Seemingly indigenous, but possibly introduced from further east, as 
this' is the only locality in our district from which it has been 
reported. 
HELIOPSIS, Pers. Ox-eye. False Sunflower. 
^ 528. H. laevis, Pers. 
Dry banks, fields and copses; common. July — October, rt ? 
+ 529. H. scabra, Dunal. 
H. Icevis , Pers., var. scabra, T. & G. 
With the last; frequent. August — September. (B.) 
Achenia slightly pubescent on the angles, the whole plant more or 
less roughish or hispid. 
