APRIL, 1919. XANTHIUM MILLSPAUGH AND SHERFF. 19 



TENNESSEE: vicin. Smyrna, Sept. 7, 1898, H. Eggert (Hb. Mo. 85404 

 and 85405). WEST VIRGINIA: Sweetsprings, Steele and Steele 271 

 (Hb. Gray; Hb. Mo. 85401). ALABAMA: Auburn, in cultivated fields, 

 F. S, Earle 2202 (2 sheets in Hb. N. Y.); Auburn, Sept. 18, 1897, Earle 

 and Baker (Hb. N. Y.). ILLINOIS: St. Clair County, Indian Lake, Sept. 

 25, 1903, H. Eggert (Hb. Mo. 85420) j 1 MISSOURI: Swan, B. F. Bush 589 

 (Hb. Mo. 85411); Courtney, in fields, idem 871 (Hb. Mo. 85407); 

 Courtney, in bottoms, idem 873 (Hb. Mo. 85410) ; Courtney, in bottoms, 

 idem 7809 (Hb. Mo. 809933) ; St. Louis, cultivated fields, especially in 

 rich land, Aug. 1845, Dr. George Engelmann (Hb. Mo. 85415 and 85416); 

 St. Louis, riverbanks, July, 1837, C ar l A. Geyer (Hb. Mo. 85414); 

 Neck City, low ground, E. J. Palmer 1304 (Hb. Mo. 85421 and 756630); 

 Noel, Butler Creek, gravel bars, idem 4220 (Hb. Mo. 716541). Kansas: 

 Atchison County, in fields, A. S. Hitchcock 727 (Hb. Gray; Hb. Mo. 

 85424); Riley County, low ground, /. B. Norton 261 (Hb. Gray). 

 NEBRASKA: Red Cloud, .Rev. J. M. Bates 5450 (Hb. Gray). OKLAHOMA: 

 Sapulpa, B. F. Bush 298 (Hb. Mo. 85426). ARKANSAS: Fulton, in fields, 

 B. F. Bush 965 (Hb. Mo. 85422). LOUISIANA: Natchitoches, wet 

 ground, E. J. Palmer 8727 (Hb. Mo. 794561). TEXAS: Columbia, in 

 fields, B. F. Bush 1348 (Hb. Mo. 85428); Dallas, in fields, J. Reverchon 

 2591 (Hb. Mo. 85431; Hb. N. Y.). CALIFORNIA: Fort Yuma, Colorado 

 River bottoms, 5. B. Parish 8360 (Hb. Gray; a puzzling specimen, 

 in some respects strongly suggesting X. strumarium L., which has been 

 collected west of here by Brandegee at Cameron Lake. See X. stru- 

 marium L.). MEXICO: La Laguna, near Vera Cruz, J. M. Greenman 47 

 (Hb. Field 189512; Hb. Gray). BERMUDA ISLS.: Devonshire, cultivated 

 ground, Brown and Britton 374 (Hb. Field 203890; Hb. Gray); waste 

 grounds near Tucker's Town, iidem 1724, (Hb. U. S. 758285). BAHAMA 

 ISLS. : Nassau, waste grounds, Britton and Brace 383 (Hb. Field 171815) ; 

 Nassau, Nov., 1890, A. S. Hitchcock (Hb. Field 174738). CUBA: Playa 

 de Cojimar, on coral limestone near the sea, Mar. 16-26, 1906, A. S. 

 Hitchcock (Hb. Field 235055); Prov. Havana, Santiago, plantations, 



1 In the same herbarium (No. 759001) is another good specimen, by Eggert, from 

 waste places, vicinity of East St. Louis, Illinois, Oct. 14, 1886; on the same sheet with 

 it is a specimen, closely similar in habit and foliage, but in fruits approaching X. 

 pennsylvanicum Wallr. with which species it seems to be a hybrid. This second 

 specimen is identical with two others of the same date, by Eggert (Hb. Mo. 721197; 

 Hb. Gray). A fifth specimen of the same date and locality, likewise by Eggert 

 (Hb. Mo. 85526) is even more clearly a hybrid: its burs are fusiform, dark reddish- 

 brown, sparsely and inconspicuously glandular-pubescent, very sparsely aculeate, 

 with only about 25-40 uncinate, subglabrous (unless sparsely hispid at the base) 

 prickles, the body of the mature burs about 1.6 cm. long and 5.5 mm. thick; prickles 

 and beaks 4-6 mm. long; the achenes mostly abortive. The burs of this last speci- 

 men present in their technical characters a slight resemblance to those of X. Wootoni 

 Cockll. but this resemblance is very superficial and disappears upon visual comparison 

 of the two sorts. 



