THE PLANT WORLD. 



171 



of the plant of which it is a part seems to dominantly occupy in its 

 apical cell, and the manifestation of that nature reaches its culmination 

 in the ovarj. It is within the ovary that the varietal nature is im- 

 parted to the seeds of certain plants, but not of all and only in the 

 covering of the ovary of our ordinary fruit plants that the varietal 

 fruit characters are developed. 



Smithsonian Institute, November, 1!)00. 



AMERICAN AND ENGLISH WEEDS COMPARED. 

 By Byron D. Halstp:d. 



DR. W. G. Smith, Lecturer on Agricultural Botany in the York- 

 shire College, Leeds, England, has recently published a list of 

 "One Hundred Yorkshire Weeds". A comparison of this 

 list has been made with the "First Century of American Weeds" pre- 

 pared and widely distributed by the writer in 1890. 



Below we give this list with a numeral added after those species 

 which are in the English centur}'. No attempt has been made to revise 

 the nomenclature, and it is therefore fully ten years old. ' 



Mollugo verticillula L. 

 Daucus Carota L. (10) 

 Pastinaca sativa L. 

 Diodia teres Walt. 

 Dipsaciis sylvaticus Hud. 

 Achillea Millefolium L. (11) 

 Ambrosia artemisiaefolia L. 

 Ambrosia Iritida L. 

 Anthemis arvensis L. 

 Anthemis Cotiila L. 

 Arctium Lappa L.| 

 Bidens bipinnata L. 

 Bidens frondosa L. 

 Chrysanthenuim Lcnu'anthemum 



L. (12) 

 Cichorivim Intybus L. 

 Cnicus arvensis Ij. (1:5) 

 Erechtites hieracifolia L. 

 Erigeron Canadensis L. 

 Erigeron ramosus Walt. 

 Helenium tenuifoliiim Null. 

 Hieracium aurantiacum E. 

 Eaclnca Scariola L. 



