BOTANY. 89 



Siwhium laciniatum L. Rosin-weed. Compass-Plaut. 



Given for Ohio in former catalogues. We have seen no specimens. 



Siuhium perforatum L. Cup-Plant 



Common throughout western half of the state. Painesville, H. C. Beardslee 

 (Cat.) 



Silphium terebinthinaceum L. Prairie Dock. 



Throughout the western half of the state, from Lake Erie to the Ohio River. 



SltPHIUM TEREBINTHINACEUM PINNATIPIDUM ( Ell. ) Gray. 



"Darby Plains, O.," J. L. Riddell (Synop. 1835); Fairfield Co., W. A. Kellerman ; 

 . Springfield, Mrs. E. Jane Spence ; London, Mrs. K. D. Sharpe. 



SlI,PHIUM TRIFOLIATUM L. 



Throughout the state. 



21. PARTHENIUM L. 



PARTHENIUM HYSTEROPHORUS L. 



Grounds of Sell's Bros. Circus, (near Columbus) ; W. J. Green. 



22. AMBROSIA Tourn. Ragweed. 



Ambrosia artemisiaefoua L. Roman Wormwood. Hog-weed. Bitter-weed. 

 Common everywhere in fields and waste-places and along roadsides. 



Ambrosia trifida L. Great Rag-weed. 



Common in low grounds and along streams all over the state. 



Ambrosia Trifida integrifolia (Muhl.) Torr. and Gray. 

 With the ordinary form. 



23. XANTHIUM Tourn. Cocklebur. Clotbur. 



Xanthium canadhnse Mill. 

 Everywhere over the state. 



Xanthium canadense echinaTum (Murr.) Gray. 



Lorain Co., A. A. Wright (Cat.) ; Columbus, Aug. D. Selby. 



Xanthium spinosum L. 



Dayton, H. A. Surface, Mrs. E. Jane Spence; Cincinnati, Jos. F. James ( Cat.) 



Xanthium strumarium L. 



Cincinnati, Jos. F. James (Cat) ; Franklin Co., Selby and Craig (Cat) 



24. HELIOPSIS Pers. Ox-eye. 



HeliopsiS hewanthoides (L.) B. S. P. (H. laevis Pers.) 

 Common all over the state. 



