Sheldon: extensions of plant ranges. 15 



This plant is no doubt near to Polygonum emersum (Mx.) Britt. 

 but it differs in its larger size, aquatic habitat, the geniculate, 

 branching, tumid stems and the obcuneate, almost glabrous, 

 obliquely attached leaves. The proposed species prefers shal- 

 low, sandy lake bottoms in clear water, which is in contrast to 

 the muddy edges of sloughs and swamps, the ordinary habitat 

 of Polygonum emersum. 



Lake Mora, Kanabec county, Minn. {E. P. S., July, 1892); 

 Lakeville lake, Dakota county, Minn, [E. P. S., August, 1893); 

 Big Stone lake. Grant county. South Dakota (E. P. S., Sept., 

 1893); small lakes near Willmar, Kandiyohi county, Minn. ( W. 

 D. Frost, July, 1892); near Nicollet, Nicollet county, Minn, (C 

 A. Ballard, July, 1892). 



Claytonia latifolia (Solander). 



Claytonia virginica Linn. var. latifolia Solander in Ait. Hort. 



Kew. 1 : 284. 1789. 

 Claytonia caroliniana Michx. F1. 1 : 160, 1803. 



Hitherto the only Minnesota collections of this species have 

 been made along the southeastern border of the state. It is 

 abundant in copses at Highland Park, near Duluth, Tower and 

 Encampment, Minn. {E. P. S., June, 1893). 



Lychnis drummondii (Rupr.) Wats. King's Rep. 5:37. 

 1871. 



Not previously reported from Minnesota, although occurring 

 in Winnipeg and south in the Rocky mountains. It was found 

 on sandy, sterile ground near Princeton, Mille Lacs county, 

 Minn. {E. P. S., July, 1892). 



Ranunculus circinatus Sibth. PL Oxon. 1794. 

 Hitherto Minnesota collections of this species have been 

 made only at Vermilion lake (L. H. Bailey, July, 1886). It was 

 found in abundance at Silver lake. Otter Tail county, Minn. [E. 

 P. S., August, 1892). The plant has the habit of recurving the 

 flower-peduncles after flowering, thus withdrawing the fruit 

 under water to ripen; (carpotrojjische Bewegung). 



Nasturtium anipliibium (Linn.) R. Br. in Ait. f. Hort. 

 Kew. 4 : 110. 1814. 



Not previously reported from the United States, although 

 collected by Dr. John Macoun, at Fort William, Lake Superior. 

 It was found in ditches and borders of small lakes near Milaca, 

 Mille Lacs county ,'Minn. {E. P. S., July, 1892). 



