10 



This weed is also very troublesome in Europe. (Thaer, 1.) 



The following two ought to be included, but neither of them 

 is troublesome : Cerastium viscosum, L. Mouse Ear Chickweed. 

 SteUaria media. Smith. Common Chickweed. Troublesome 

 in Europe. (Thaer, 2.) 



Sajwnaria vaccaria, L. Cow Herb. 



Becoming abundant in grain fields in Houston County. Minn. 

 The larger seeds are often found in seed wheat after cleaning. 

 The smaller enter into " screenings." 



POETULACEAE. 



Portulaca oleracea, L. Common Purslane. 



This common garden weed with succulent stems and leaves is 

 well known by almost everyone who has had any experience in 

 gardening. This plant ought not to be left in the field or garden 

 when pulled up, as the severed parts readily develop into new 

 plants by the formation of roots. It is also a well-known weed in 

 Europe. Fendler found it wild in Texas and Xuttall on the Mis- 

 souri. (Dr. Gray, 2.) Something very near to the common 

 purslane was found by Lindheimer (Euglemann). It has the 

 appearance, however, of being naturalized. 



MALVACEAE. 



Malva rotund {folia, L. Common Mallow. 



Common around old dwellings, along roadsides, etc. Found 

 in similar places in Europe. 



Abut Hon avicennae. Gaertn. Indian Mallow. 



It has spread quite rapidly. A few years ago, 18S2-83, some 

 straggling specimens were found along roadsides; now it is 

 abundant in gardens and fields, especially where the soil is loose 

 and of a loamy nature, or in loamy drifts. Last summer I found 

 a field in the northern part of La Crosse Co., Wis., where it had 

 completely taken possession. The plant is a native of Asia, and 

 has probably moved northward along the Mississippi Eiver. 

 Baron von Mueller reports it as occurring in Australia. 



* 



GERANIACEAE. 



Oxalis stricta, L. Yellow Wood Sorrel. 



Common in grain fields, not particularly troublesome. 



