APRIL, 1919. XANTHIUM MILLSPAUGH AND SHERFF. 33 



Webb City, low ground, E. J. Palmer 767 (Hb. Mo. 756626) ; La Russell, 

 low ground, idem 1300 (Hb. Mo. 85456; fruit with bristly prickles and 

 approaching that of X. italicum Mor.). ARKANSAS: Fulton, along river, 

 B. F. Bush 1027 and 1028 (Hb. Mo. 85423 and 85543 respectively). 

 NORTH DAKOTA: Leeds, waste places, Aug. 21, 1902, Dr. J. Lunell 

 (Hb.Gray). NEBRASKA: Red Cloud, Rev. J.M. Bates 4745 (Hb. Gray). 

 KANSAS: Manhattan, Sept. 20, 1887, W. A. Kellerman (Hb. Mo. 85449); 

 Riley County, low ground, /. B. Norton 261 (Hb. Mo. 85448). OKLA- 

 HOMA: Sapulpa, B. F. Bush 299 (Hb. Mo. 85544); vicin. Ottawa, low 

 waste place, G. W. Stevens 2568 (Hb. Gray). TEXAS : Columbia, in sand, 

 B. F. Bush 1344 (Hb. Mo. 85467); Dallas, in wastes, /. Reverchon 2589 

 (Hb. Mo. 85480, 85481 and 85546). COLORADO: Naturita, moist ditch 

 bank, Ernest P. Walker 545 (Hb. Gray; Hb. U. S. 544637). NEVADA: 

 Washoe County, Truckee Pass, Sept. 15, 1909, A. A. Heller (Hb. Calif. 

 196027; a form with burs precisely like those on type of X. acutum 

 Greene at Hb. Greene, except slightly pubescent). IDAHO: New 

 Plymouth, waste ground, /. Francis Macbride 718 (Hb. Gray, having 

 burs almost exactly identical with those on type of X. acutum Greene, 

 in Hb. Greene; a rather immature specimen is also in Hb. Mo. 85515). 

 UTAH: Vermilion, Marcus E. Jones 5842 (Hb. Mo. 85490 and 85492); 

 Peterson, Peterson Canyon, Pammel and Blackwood 3888 (two sheets in 

 Hb. Gray); road between Monticello and Bluffs, Rydberg and Garrett 

 9872 (Hb. U. S. 765345). ARIZONA: Tucson,Valley of Santa Cruz River, 

 John J. Thornber 8 (Hb. Mo. 85496; Hb. Calif. 129897). WASHINGTON: 

 Waitsburg, bars of streams, Robt. M. Homer B 273 (Hb. Gray; this is not 

 X. varians Greene as erroneously stated by Piper, Contrib. U. S. Nat. 

 Hb. ii : 551. 1906) ; West Klickitat County, sandy banks of Columbia 

 River, W. N. Suksdorf 1584 (Hb. Field 89752 and 89753; Hb. Calif. 

 130204; Hb. Gray; Hb. Greene 19830; type and cotypes of X. affine 

 Greene). OREGON: Union County, Snake River, sand-bars, W. C. 

 Cusick 1000 (Hb. Gray); near Prineville, /. B. Leiberg 842 (Hb. Gray). 

 CALIFORNIA: Los Angeles County, near Soldiers' Home, Sept., 1905, 

 Dr. J. Q. Adams (Hb. Calif. 74043) ; San Diego County, vicin. Ramona, 

 Stockton Ranch, Oct., 1905, Katharine Brandegee (Hb. Calif. 168741; 

 burs identical with those on type and cotypes of X. affine Greene); 

 vicin. Ramona, Stockton Ranch, Oct., 1905, eadem (Hb. Calif. 168816; 

 a form with burs matching those on type of X. calif ornicum Greene in 

 Hb. Greene); vicin. Ramona, Stockton Ranch, Oct., eadem (Hb. Calif. 

 168813) ; vicin. Mendocino, H.E. Brown 938 (Hb. Mo. 85391 ; this is not 

 X. echinatum Murr., as erroneously stated by Thellung, Verhandl. Bot. 

 Verein Brandenb. 50: 144. 1908); roadside near Yreka, George D. 

 Butler 527 (Hb. Calif. 164145); Escondido, Harley P. Chandler 5399 



