54 BULLETIN OF THE LABORATORIES 



428. C. arvensis Hoffm. Canada Thistle. 



Fields, found only in a few places in the county. July 9, 1890. 



199. Centaurea L. 



429. C. Cyanus L. Bluebottle. 



Escaped into waste places, rare. May 29, 1884; July 6, 1890. 



200. Krigia Schreber. 



430. K. amplexicaulis Nutt. 



Rocky banks, rare; eastern part of county. May 31, 1890; June 

 4, 1891. 



201. Hieracium Tourn. 



431. H. paniculatum L. 



Rocky, wooded banks, common. August 23, 1890; September 

 27, 1891. 



432. H. venosum L. Rattlesnake-weed. 

 Rocky banks, common. June 25, 1889. 



433. , H. scabrum Michx. 



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



434. H. Gronovii L. Hairy Hawkweed. 



202. Prenanthes Vaill. 



435. P. altissima L. 



Herbariums of Mr. W. E. Castle and Dr. F. O. Jacobs; rare. 

 August 28, 1890. 



203. Taraxacum Haller. 



436. T. officinale Weber. Common Dandelion. 

 Common everywhere. June 5, 1890. 



204. Lactuca Tourn. 



437. L. Scartola L. Prickly Lettuce. 



Waste places everywhere. July 25, 1887; July 30, 1890. 



438. L. Canadensis L. Wild Lettuce. 

 Roadsides, common. June 25, 1890. 



439. L. integrifolia Bigel. 



River banks, rare; Toboso. August 23, 1890. 



