294 Proceedings of Indiana Academy of Science 



control it is almost certain to spread itself over most of the cultivated 

 areas of the state. During the past season this station has received 

 numerous urgent appeals for some definite advice concerning methods 

 for controlling this pest." 



Mexican clover. {Richardia scabra L.) A new weed that is ap- 

 pearing in abundance in fields in the northeastern part of Henry County. 

 It is a very common weed in the southern states, particularly in the 

 gulf states, although it rarely becomes very troublesome. The com- 

 mon name is misleading since the plant is not a clover but is a member 

 of the Rubiaceae. 



Lawn pennywort. {Hydrocotyle rotundifolia Roxb.) Recently re- 

 ported as a new lawn weed in America in Department of Agriculture, 

 Circular 165. Its distribution was reported as the District of Columbia, 

 locally in Pennsylvania, and near Louisville, Kentucky. The species was 

 discovered as a serious lawn pest in Evansville, Indiana, where it 

 presents a difficult lawn problem. It is a native of southern Asia. 



Welted thistle. (Carduiis crispu.s L.) Occurs locally in the eastern 

 states. The species was found established in Union County, Indiana. 

 It is a perennial and a native of Europe and Asia. 



Western brome grass. {Bromus carinattis Hook and Arn.) A 

 native western perennial that is common on the Pacific Coast, was found 

 on the farm of Smith Brothers, Middlebury, Indiana. Since immediate 

 measures were taken for the destruction of the several patches found 

 it is not likely that the species will persist. 



Phacelia. {Phacclia jmrsJiii Buckl.) A native annual that is 

 causing much damage to oats, clover and wheat in Rush and Wayne 

 Counties. In one part of Rush County about 500 acres of clover and 

 wheat were seriously infested during the spring of 1922. The plant 

 seems to choke out the crop, causing an uneven stand. No record can 

 be found of this species causing damage as a field weed in other sections 

 of the United States. 



Bermuda grass. (Capriolu dactylon (L.) Kuntze.) Bermuda grass, 

 ordinarily considered to be a weed in the southern states only, is locally 

 troublesome throughout Indiana, where it is frequently mistaken for 

 quack grass. Although one of the worst weeds in the south, the species 

 is at the same time a valuable lawn and pasture plant in the .southeastern 

 states. Shallow fall plowing followed by a good shade crop should 

 kill Bermuda grass. 



Johnson grass. (Holcus halepensis L.) The statement is frequently 

 heard that Johnson grass cannot persist north of the Ohio River. The 

 plant has been established in Indiana for a number of years and is 

 known to be troublesome as far north as Vigo County, particularly in 

 the vicinity of Terre Haute where it covers about five hundred acres 

 of land. The farmers contend that it is one of the worst weeds in 

 the county. It is said to have been introduced into Vigo County by 

 means of western hay. Johnson grass is also troublesome in Scott 

 County. 



Gum Plant. {Gmidelia rohusta Nutt.) A native western species 

 that occurs principally along the California coast, has been reported 



