XXII. A CONTRIBUTION TO THE KNOWLEDGE 

 OF THE FLORA OF SOUTHEASTERN 

 \ MINNESOTA. 



W. A. Wheeler. 



The work of the Minnesota Botanical Survey in southeastern 

 Minnesota during the summer of 1899 was carried on with two 

 main purposes in view : first, to collect and preserve plants in 

 formalin for museum and class use, and second, to collect 

 herbarium specimens of the higher seed plants. The work of 

 collection was begun June ist, and closed August 31st. The 

 catalogue of species is, therefore, very incomplete in its enu- 

 meration of the early spring and autumn plants. 



District of collection. — The territory in which the collections 

 were made is in the extreme southeastern part of Minnesota, 

 comprising the valleys of Winnebago and Crooked creeks, and 

 the adjoining region near the Mississippi river. Nearly all of 

 this territory is included in an area about twelve miles square, 

 formed by the townships of Mayville and Crooked Creek, on 

 the north, and Winnebago and Jefferson on the south. 



Physiography. — The topography of this part of Houston 

 county is not essentially different from that of most of the re- 

 gion south from Red Wing along the Mississippi river to the 

 southern boundary of Minnesota and into Iowa. There is no 

 part of it level or nearly so. It is almost entirely broken by 

 the valleys of the two creeks and their smaller tributaries. The 

 height above the sea level varies from 620 feet at the level of 

 the Mississippi river in the southeastern corner of Jefferson, to 

 1200 feet in the northwestern corner of Mayville. Crooked 

 creek, from the source of the north fork to its discharge into 

 Bluff slough, is about eleven miles in length. It drains about 

 65 square miles of territory. The south fork, a branch about 

 three miles long, lies entirely in Mayville. Winnebago creek 

 from the Big spring near its source, to its discharge into Min- 



353 



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