1 8 FIELD MUSEUM OF NATURAL HISTORY BOTANY, VOL. IV. 



Caulis scaber, 0.3-1 (aut etiam-2) m. altus. Folia late triangulato- 

 orbiculata, acute 3-5-lobata, subacute dentata, ad basim cordata aut 

 reniformia, plerumque submembranacea, utrinque concoloria et pilis 

 setosis adpressis brevissimis vestita, petiolis adjectis 1-3 dm. longa, 

 inferiora interdum 2.5 dm. lata, petiolis laminis subaequantibus. 

 Fructus (PI. VII, f. 3; PI. VIII, ff. 9-15) ovoidei aut fusiformes, calves- 

 centes, aequaliter et conformiter aculeati, fusco-virides aut rubescentes; 

 corpore sparsissime brevi-pubescenti, glanduloso, 0.9-1.5 cm. longo 

 (rarius longiore); rostris rectis aut arcuatis, infra pubescentibus, ad 

 apicem inflexis aut infirme hamosis, 3-6 mm. longis; aculeis glabratis 

 aut ad basim sparsim glanduloso-pubescentibus, rectis, ad apicem hamo- 

 sis, rostris aequantibus. 



DISTRIBUTION: Massachusetts, Ontario and Nebraska, to Florida, 

 Texas and California (where very rare) ; eastern Mexico and throughout 

 the West Indies. 



SPECIMENS EXAMINED: 1 MASSACHUSETTS : Wayland, Sept. 10, 1909, 

 M. L. Fernald (Hb. Gray). CONNECTICUT: Goshen County, wet ground, 

 Sept. 18, 1905, C. H. Bissell (Hb. Gray) ; West Hartford, border of pond, 

 Oct. 14, 1906, idem (Hb. Gray). NEW YORK: Long Island, Lakeville, 

 waste place, Sept. 25, 1899, /. R. Churchill (Hb. Gray) Canton, banks 

 of Grass River, Mrs. Orra Parker Phelps 980 (Hb. Gray) ; Ogdensburg, 

 along banks of St. Lawrence River, eadem 1215 (Hb. Gray; an unique 

 form with abnormally large fruits having bodies 1.9-2.4 cm. long and 

 7.5-9.5 mm. thick). PENNSYLVANIA: near Philadelphia, John H. Red- 

 field 3475 (Hb. Mo. 85397). MARYLAND: Plummer's Island, in Potomac 

 River, near Cabin John, Thomas H. Kearney 193 (Hb. U. S. 640356); 

 shore of Chesapeake Bay, south of Havre de Grace, George H. Shull 392 

 (Hb. Gray; Hb. Mo. 85399). DISTRICT or COLUMBIA: Washington, 

 Charles L. Pollard 718 (Hb. U. S. 234642). VIRGINIA: Bedford County, 

 Oct. 10, 1871, A. H. Curtiss (Hb. Gray); Altavista, waste land, Juliet 

 Fauntleroy 677 (Hb. U. S. 754995). NORTH CAROLINA: Buncombe 

 County, roadside near Black Mountain, Standley and Bollman 10301 

 (Hb. U. S. 689122). FLORIDA: Lake City, anonymus (Hb. Fla. Agricult. 

 Coll. no. 1279 in Hb. Field 234909); Key West, sandy places near the 

 beach, J. K. Small 3720 (Hb. N. Y.; important as matching precisely 

 Greenman's no. 47, topotype of X. chinense from vicinity of Vera Cruz). 

 ONTARIO: Russell, near Nation River, July 28, 1911, John Macoun 

 (Hb. Mo. 719899). MICHIGAN: near Port Huron, roadside ditches, 

 C. K. Dodge 43 (Hb. Gray) ; near Port Huron, roadside ditches, idem 45 

 (Hb. Gray); near Port Huron, marshes, idem 48 (Hb. Gray). KEN- 

 TUCKY: Bowling Green, Aug., 1899, Sadie F. Price (Hb. Mo. 46001). 



1 For lack of space many specimens examined must be omitted here. Our citations 

 are complete, however, as to the material examined from Mexico and the West 

 Indies. 



