L9 



Of the 88 weeds rep'resented in this list, i»; are European, and 

 30 of American origin, one-third ol which come from tin* com 

 positae, the most t roublesome of our weeds and almost one*fourth 

 of the entire list arc members of tin- eompositae. 



The following arc some of the important papers and works on 



the SUbjeCl which have been consulted: 

 A.BTHUK, PBOF. J. C. 



tth and 5th Annual report of the X. Y. Agricultural Ex- 

 periment Station, pages 262 and 298. 



Beal. Pkof. W. J. 



Grasses of North America ( 1 ) Vol. 1. p. 2t&;(2) p. 235;i 3) p. 

 222 figures the seeds and fruits and has appended 

 some remarks concerning the common weeds affecting the 

 meadow, pp. 100, 224, 273. 

 Claypole, E. W. 



On the migration of plants from Europe to America with 

 an attempt to explain certain phenomena connected there- 

 with. 

 (3) Report of the Montreal Hort. Soc, 1877, p. 70. 

 Darlington, Wm. 



American Weeds and Useful Plants. Revised by George 

 Thurber, (1) p. 199, (2) p. 241. 



DlMITRIEYICZ, XlCOL. 



Wie lange bewahren die Samen unserer Culturpflanzen ihre 

 Keimfiihigkeit. In Haberlandt's Wissenschaftliche Un- 

 tersuchungen, etc. 

 Englemann, Dr. George. 



In Plant® Lindheimerianae, p. 154. 

 Gray, Dr. Asa. 

 Darwiniana. 



(1) Am. Naturalist, Burs in the Boarage family. Vol. X, 

 1876, p. 1. 

 Am. Jour, of Sc. Vol. XXV, p. 253, and Vol. XXVI, 

 p. 138. 

 Hakerlandt, Dr. G. 



(1) Wissenschaftlich-pracktische Untersuchingen auf dem 



Gebiete des Pflanzenbaues. 

 2 Wiener Laudw. Zeitung, 1873, p. 126. 

 Lene, Dr. Egon. 



Studien zur Pflanzengeographie; Verbreitung you Xanthium 

 strumarium und Geschichte der Einwanderung von Xan- 

 thium spinosum. 

 Kabsch. Dr. Wilhelm. 



Das Pflanzenleben der Erde. 



