APRIL, 1919. XANTHIUM MILLSPAUGH AND SHERFF. 41 



SPECIMENS EXAMINED (partial list) : QUEBEC: Leamy's Lake, Sept. 

 n, 1891, /. Macoun (Hb. N. Y.). NEW HAMPSHIRE: Charlestown, dry 

 sandy open roadsides, Sept. 16, 1899, B. L. Robinson (Hb. Gray). 

 VERMONT: Springfield, open dry sandy roadside, Sept. 16, 1899, B. L. 

 Robinson (Hb. Gray). NEW YORK: Westport, shores of Lake Cham- 

 plain, Sept. 15, 1900, Dr. and Mrs. N. L. Britton (Hb. N. Y.; type of 

 X. commune Britton) ; Sandy Hill, along Champlain Canal, Stewart H. 

 Burnham 27 (Hb. Gray); Ogdensburg, Orra Parker Phelps 1212,1213 

 and 1214 (Hb. Gray); Hogansburg, banks of St. Regis River, eadem 

 1216 (Hb. Gray). CONNECTICUT: Plainfield, waste ground, Sept. 6, 

 1908, Bissell and Weatherby (Hb. Gray); Bridgeport, dry roadsides, 

 E. H. Eames I (Hb. Gray). PENNSYLVANIA: Lancaster, Oct. 7, 1901, 

 A, A. Heller (Hb. Field 430065; Hb. Gray; a form with burs sug- 

 gesting X. pennsylvanicum). Lancaster, Dillerville Swamp, Sept. 24, 

 1889, John K. Small (Hb. Field 168555). MARYLAND: shore of Chesa- 

 peake Bay, south of Havre de Grace, George H. Shull 391 (Hb. Gray; 

 Hb. Mo. 85504). DISTRICT OF COLUMBIA: shore of Potomac River, 

 Sept. 3, 1876, Lester F. Ward (Hb. U. S. 130953). VIRGINIA: along 

 Potomac River, opposite Washington, D. C., Oct. 2, 1904, E. S. Steele 

 (Hb. U. S. 504661). WEST VIRGINIA: Hendricks, dry places along Black- 

 water River, /. M. Greenman 537 (Hb. Field 345708; Hb. Gray; form 

 matching type of X. commune Britt. very closely). INDIANA: Bluffton, 

 Sept. 9, 1897, Charles C. Deam (Hb. Field 123387); vicin. Bluffton, idem 

 548, (Hb. Mo. 85437). Kentucky: locality not stated, Dr. C. W. Short, 

 in 1842 (Hb. Gray). ILLINOIS: East St. Louis, Stockyards, Sept. 10, 

 1886, H. Eggert (Hb. Mo. 759571); sandy shore of Lake Michigan, 

 Frank C. Gates 50 (Hb. Field 458182); Champaign County, Urbana 

 Township, roadside, idem 2112 (Hb. Field 246297; an atypic form with 

 prickles more remote) ; Winthrop Harbor, idem 3228 (Hb. Field 345082 

 and 459041); Urbana, Sept. 19, 1901, A. Gilkerson (Hb. Gray; atypic 

 form with subremote prickles, approaching X. pennsylvanicum Wallr.) ; 

 Metropolis, banks of Ohio River, Aug. 14, 1902, H. A. Gleason (Hb. 

 Gray); Champaign, field, A. S. Pease 13009 (Hb. Gray); Chicago, along 

 sidewalk, Earl E. Sherjj 3079 (Hb. Field 480735 and 480736); Chicago, 

 along sidewalk, idem 3081 (Hb. Field 480739). IOWA: Ames, M. 

 Clapper 10 (Hb. Gray; Hb. Mo. 85441). MISSOURI: Courtney, in bot- 

 toms, B. F. Bush 1813 (Hb. Mo. 85601); Courtney, in bottoms, idem 

 ipio (Hb. Mo. 85458); Sheffield, idem 2216 (Hb. Mo. 85459); Webb 

 City, in cultivated fields, E. J. Palmer 1039 (Hb. Mo. 756627); Webb 

 City, waste places, idem 1303 (Hb. Mo. 85509 and 756631); Noel, 

 Butler Creek, gravel bars, idem 4219 (Hb. Mo. 716540). SOUTH DAKOTA: 

 Watertown, John J. Thornber, Aug., 1892, (Hb. Gray). NEBRASKA: 



