be 
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 tst, 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- 
393 
