32 FIELD MUSEUM OP NATURAL HISTORY BOTANY, VOL. IV. 



apicem glabris et saepius incurvatis, ad apicem hamosis, 4-6 mm. 

 longis; aculeis subremotis et subvalidis (aut rarius confertis et tenuibus), 

 versus basim glandulosis et saepe sparsim pubescentibus, aliter glabris, 

 ad apicem hamosis, interdum purpureo-tinctis, 3-7 mm. longis. 



DISTRIBUTION : Massachusetts, Ontario and Washington to Florida, 

 Texas and California; perhaps also in Mexico; frequent in the Hawaiian 

 Islands. \ 



SPECIMENS EXAMINED (partial list): 1 MASSACHUSETTS: Boston, Sept. 

 13, 1895, Emile F. Williams (Hb. Gray). RHODE ISLAND: Newport, 

 waste ground, Fernald and Long 10658 (Hb. Gray). PENNSYLVANIA: 

 without locality, invading the marshes ("in paludos"), Sept., 1824, 

 Poeppig (Hb. Mo. 85594; cotype of X. pennsylvanicum var. eglandulosum 

 Wallr.). MARYLAND: Plummer's Island, near Cabin John, T. H. 

 Kearney 221 (Hb. U. S. 640384); east shore of Maxwell's Point, above 

 tide, George H. Shull 332 (Hb. Gray) ; shore of Chesapeake Bay, south of 

 Havre de Grace, idem 390 (Hb. Gray; Hb. Mo. 85436). VIRGINIA: 

 Alexandria County, near Barcroft Station, Oct. 3, 1915, E. S. Steele 

 (Hb. U. S. 643281). FLORIDA: Hillsborough County, waste ground, 

 A. Fredholm 6426 (Hb. Gray). ONTARIO: near Sarnia, roadside ditches, 

 C. K. Dodge 49 (Hb. Gray). MICHIGAN: Port Huron, dryish ground in 

 streets, C. K. Dodge 47 (Hb. Gray). ILLINOIS: near French Village, 

 Sept. 6, 1892, H. Eggert (Hb. Mo. 85438); East St. Louis, Sept., 1847, 

 Dr. George Engelmann (Hb. Mo. 85452); Carthage, F. C. Gates 9996 

 (Hb. Field 472736); vicin. of Catlin, bank of creek, 0. E. Lansing, Jr., 

 3532 (Hb. Field 346590); Urbana, open wet soil, Sept. 19, 1901, M. S. 

 Sheldon (Hb. Gray) ; Chicago, along walk, Earl E. Sherjj 3080 (Hb. Field 

 480737 and 480738); Hinsdale, waste ground, Ernest C. Smith 529, 

 (Hb. Field 127018). KENTUCKY: locality not stated, in 1842, Dr. C. W. 

 Short (Hb. Gray). IOWA: Decatur County, in fields, Aug. 29, 1897, 

 Fitzpatrick and Fitzpatrick (Hb. Gray); Ames, without date, A. S. 

 Hitchcock (Hb. Mo. 85450). MISSOURI: Courtney, in bottoms, B. F. 

 Bush 870 (Hb. Mo. 85539); Courtney, in bottoms, idem 1789 (Hb. 

 Gray); Courtney, in bottoms, idem 1790 (Hb. Mo. 85538); Courtney, in 

 bottoms, idem 1792 (Hb. Mo. 85530); Courtney, in bottoms, idem 1793 

 (Hb. Mo. 85542); Courtney, in bottoms, idem 1794 (Hb. Mo. 85529); 

 Courtney, in bottoms, idem 1802 (Hb. Gray; Hb. Mo. 85602) ; Courtney, 

 in bottoms, idem 1809 (Hb. Mo. 85541); Courtney, in bottoms, idem 

 1911 and 1914 (Hb. Mo. 85540 and 85533 respectively; probably hybrid- 

 ized with X. chinense Miller) ; Courtney, in bottoms, idem 1915 (Hb. Mo. 

 85537); St. Louis, Aug. 25, 1874, H. Eggert (Hb. Gray); St. Louis 

 County, West Webster, Dr. J. M. Greenman 3799 (Hb. Mo. 807756); 



1 A large number of specimens omitted here from lack of space. 



