so BULLETIN OF THE LABORATORIES 



179. SiLPHIUM L. 



379. S. trifoliatum L. 



River banks, rare; Toboso. July 15, 1891. 



380. S. perfoliatum L. Cup-plant. 



Creek banks, common. July 21, 1887; July 17, 1890. 



180. Ambrosia Tourn. 



381. A trifida. L. Great Ragweed. . 



Alluvial soil, common. September 2, 1887; August 13, 1890. 



382. A. trifida L. Var. integrifolia Torr and Gray. 

 Same as last. September 13, 1890. 



383. A. artemisiaefolia L. Ragweed. Hogweed. 



Common everywhere. August 15, 1887; August 13, 1890; Sep- 

 tember 10, 1891. 



181. Xanthium Tourn. 



384. X. Canadense Mill. Cocklebur. 



Common everywhere. August 27, 1887; August 21, 1890. 



182. Eclipta L. 



385. E. alba Hassk. 



Moist soil, rare; Licking Reservoir. August 7, 1891. 



183. Heliopsis Pers. 



386. H. laevis Pers. 



Alluvial soil, common. July 18, 1889; July 8, 1890. 



184. Rudbeckia L. 



387. R. laciniata L. 



Creek banks, waste places; common. September r5, 1888; Au- 

 gust 8, 1890. 



388. R. hirta L. 



Meadows, common. July 8, 1888; June 23, 1889; June 25, 1890. 



389. R. fulgida Ait. 



Dry soil, rare; Toboso. August 23, 1890. 



185. Helianthus L. 



390. H. annuus L. Common Sunflower. 

 Waste places, where it exists for a year or two. 



