43 



The only other significant note is Kdwin I). Hull's report* 

 in 1913 of the presence of P. crispus in the lagoons of Jackson 

 Park, Chicago, and in Wolf Lake, Indiana. In these waters, 

 which are in direct connection with Lake Michigan and close 

 to the lakeshore, this pondweed had been well known to Mr. 

 Hull since 1909; and in the lagoons it had become so abundant 

 as to be a nuisance. But in Chicago's Washington Park, about 

 a mile westward from the lakeshore, lagoons not connected 

 with the lake yielded Mr. Hull no specimens. 



Lake Nippersink, in which our chance collection was made, 

 lies near the northwest corner of Lake County, 20 miles west of 

 Lake Michigan and about 45 miles northwest of Jackson Park. 

 It is one of a number of glacial lakes in Illinois and Wisconsin 

 that are drained by the F"ox River, a tributary of the Illinois 

 River and one of the headwaters of the Mississippi System. 



Our collection and Mr. Hull's note record, within a distance 

 of 50 miles, the presence of this pondweed in two great river 

 systems. There is, of course, direct water connection between 

 the two, by way of the reversed flow of the Chicago River and 

 the Drainage Canal; and if these were the only records at hand 

 this might serve as a plausible though unlikely explanation of 

 the two occurrences. 



As a result, however, of the courteous response given my 

 inquiries by the botanists in several important herbaria, I have 

 at hand a large list of specimens of P. crispus, in which I find 

 three citations of particular interest. From the Brooklyn 

 Botanical Garden, Norman Taylor cites two specimens, the 

 first taken by D. Griffiths in July, 1896 in Edmonds County, 

 South Dakota, the second taken by D. Griffiths and E. L. 

 Morris August 19, 1901 near Silvies in east-central Oregon. 

 And from the University of Wisconsin Herbarium J.J. Davis 

 has very obligingly sent for my inspection a specimen taken by 

 N. C. Fassett and L. R. W^ilson (No. 4348) August 26, 1927 from 

 the Minnesota side of the Mississippi near Kellogg. 



These records give to P. crispus an almost cross-continental 

 range; but our Illinois specimen, in company with three Michi- 

 gan specimens cited to me by Professor Darlington as having 

 been collected in Van Buren County (L. H. Pennington, 1910) 

 and in Black Lake and Pigeon Lake two years ago, as well as 



*Rhodora 15: 171-172. 



