226 MINNESOTA liOTANICAL STUDIES. 



Caltha nataus Pall. Reise Russ. 8 : 284. 1776. 



Collected near Tower, Minn. {E. J. Hill, 1889), also col- 

 lected in the same locality {J. H. Sandberg, July, 1891). 

 Reported by E. J. Hill in Bot. Gaz. 1 5 : 307. 1890. 



Erysimum syrtieolum Sheldon Bull. Torr. Bot. Club. 20: 



285. 1893. 



The locality of the type is on the high, sandy banks of 

 Lake Benton, Lincoln county, Minn., where I collected it in 

 August, 1891. During August, 1892, I found it sparingly on 

 the gravelly shores of Pelican lake Otter Tail county, Minn. 

 This species resembles E. inconspicuum (S. Wats) MacM., 

 but the glaucous, strict aspect and short pods characterize it. 



Reported by Edmund P. Sheldon in Bull. Torr. Bot. Club. 

 20:285. 1893. 



Nasturtium obtusura Nutt. in T. and G. Fl. 1 : 74. 1838. 



Frequent in low marshy ground near Fergus Falls, Otter 

 Tail county, Minn., {E. P. S., Aug., 1892). 



Reported by Edmund P. Sheldon in Bull. Torr. Bot. Club. 20: 



285. 1893. 



Crataegus punctata Jacq. Hort. Vindob. 1: 10. 1770. 



A number of scattered bushes were found growing on open 

 hillsides near Center City, Chisago county, Minn., {B. C 

 Taylor, June, 1892). 



Reported by Edmund P. Sheldon in Bull. Torr. Bot. Club. 



20:285. 1893. 



Elatine americana (Pursh) Arn. Edin. Journ. Nat. and 

 Geogr. 1 : 430. 1830. 



This was found in abundance, growing in 2-6 inches of water 



at Linn lake. Chisago county, Minn., {B. C. Taylor, Aug., 1892). 



Reported by Edmund P. Sheldon in Bull. Torr. Bot. Club. 



20:285. 1893. 



Myriopliylliim humile (Raf.) Morong Bull. Torr. Club. 

 18 :242. 1891. 



31. ambiguum Nutt. var. Hmosum^MTT. Gen. 2 : 212. 1818. 



It was found rooting in the mud about Irving Chase lake, Cass 

 county, and near the water line of other neighboring forest 

 lakes. {Conivay MacMillan and Edmund P. Sheldon, Aug., 1892.) 



Reported by Conway MacMillan in Bot. Gaz. 15 : 332. 1890. 



