216 Proceedings of Indiana Academy of Science 



Since then it has developed into a noxious grainfield weed throughout the 

 grain-producing areas of the northwest. 



A number of specimens of this plant were received on June 8, 

 1923, from L. M. Busche, of Decatur, Adams County, Indiana, where 

 the species is apparently established as a grainfield weed. 



Miscellaneous. — Among new species found in Indiana that are not 

 known to be noxious in other parts of the United States may be men- 

 tioned yellow alfalfa, Medicago hyhrida (Pourr.) Traut., common along 

 fence rows on the Purdue Farm in West Lafayette, and Nuvarretia 

 pubescens, Hook, and Arn., a number of flowering specimens of which 

 were found in a clover field in Randolph County on August 29, 1923. 

 Radiculu pabistris (L) Moench, of common occurrence on moist land 

 throughout Indiana but not ordinarily considered as a noxious weed, 

 was found to be exceedingly troublesome near Veedersburg. 



The Division of Botany of the Purdue University Agricultural Ex- 

 periment Station will appreciate data regarding the occurrence of new 

 plants in Indiana that are apt to prove troublesome as weeds. Infor- 

 mation of this character is particularly valuable when the infested area 

 is small, since an attempt is being made to eradicate potentially trouble- 

 some plants before they have had an opportunity to become widespread. 



A WEED SURVEY OF INDIANA.^ 

 Albert A. Hansen, Purdue University. 



A regional flora, such as Coulter's "Flora of Indiana", records the 

 occurrence of plants but gives little information regarding the degree to 

 which weedy species are troublesome. 



In order to secure data of this type a weed survey of Indiana is 

 being undertaken by the Extension Division of the Botanical Department 

 of the Purdue University Agricultural Experiment Station. Three 

 sources of information are being used, (1) the county agent, (2) field 

 observations and (3) the experience of individual farmers, secured from 

 correspondence and by the questionnaire method. 



The first step in securing this information was taken during the 

 winter of 1922 when a questionnaire was sent to the county agents in 

 84 counties of the state. Each agent was asked to give the names of 

 the five worst weeds in his county, and 71 replies were secured. Since 

 the county agent, by the very nature of his occupation, is usually best 

 qualified to give information concerning agricultural matters in his 

 county, it is felt that reliable information was secured by this method. 

 The results are not only of general interest, but have a practical value. 

 They may also be of ecologic interest in present and future studies of 

 the weed problem in Indiana. 



The reports from the different counties are shown graphically in 

 figure 1. The county numbers on the map each represent a species 



1 Contribution from the Botanical Department (Extension Division) of the Pur- 

 due University Agricultural Experiment Station. 



