XXI. AN ADDITION TO THE KNOWLEDGE 



OF THE FLORA OF SOUTHEASTERN 



MINNESOTA. 



C. O. RoSENDAHL. 



Further work of the Minnesota Botanical Survey carried on 

 in the southeastern part of the state during the month of June, 

 1902, resulted in the collection of about 100 species additional 

 to those previously reported from the region by Mr. W. A. 

 Wheeler * and also extended several plant ranges. 



The territory covered is limited to the southwestern part of 

 Houston county and the eastern part of Fillmore county as far 

 north as the Root river. 



Most of the collecting was done however in Spring Grove 

 and Blackhammer townships, and a single excursion only was 

 made into the part of Fillmore county above mentioned. 



The topography of this part of Houston county differs con- 

 siderably from the remaining region north and east, the largest 

 part of which is much the same as that described in Mr. 

 Wheeler's report. 



Spring Grove, the corner township, is the highest part of 

 the county, its elevation ranging from 1,050 feet in the north- 

 west corner to over 1,300 feet on section 16, situated near the 

 center. 



There are numerous valleys throughout the southern and 

 southeastern part of the township and a few in the northwestern 

 part. None of these is deep and nearly all of them have gradu- 

 ally sloping sides to within 30-60 feet from the top of the ridges 

 where the incline is more abrupt. 



These valleys, and slopes also, are generally cultivated and 

 the valleys possess the richest soil of the region. 



They nearly all trend north and northwest and south and 

 southeast from both sides of a high central ridge running from 

 the southwestern to the northeastern part of the township. 



*A contribution to the knowledge of the flora of southeastern Minnesota. 

 Minn. Bot. Studies, 2 : 353. 1900. 



257 -t 



