466 MINNESOTA BOTANICAL STUDIES ^ 



Isoctes lacustris L. 



Reported in Upliam's Catalogue and Lyon's list of Pteridophyta of 

 Minnesota; should be referred to /. macrospora Dur. 



Gymnospermae 



Picca rubra (Du Roi) Dietr. 



Reported in Gray's Manual as occurring in Minnesota; no specimens; 

 it is extremely doubtful if it occurs in the state. 



Juniperus communis L. 



The arborescent form does not occur in the state ; the common form 

 throughout is var. dcprcssa Pursh. ; var. montana Ait. grows on Isle 

 Royale, and it is likely that it occurs on the north shore of Lake 

 Superior. 



Angiospermae 



MONOCOTYLEDONES 



> Typha angustifolia L. 



Does not occur in the state ; a single specimen in the University 

 Herbarium, collected by J. H. Sandberg in Carleton County, is so 

 labelled but is merely a small specimen of T. latifolia L. 



Sparganium americanum Nutt. 



Implied in Britton's Manual to occur; the only Minnesota speci- 

 mens in the University collection are of the var. androcladum 

 (Engelm.) Fernald and Eames. 



Sparganium simplex Huds. 



No specimens ; the report of this species appears to be based on 

 specimens of S. divcrsifolium Graebner and S. divcrsifolium var. 

 acaule (Beeby) Fernald and Eames. 



Potamogeton illinoensis Morong. 



Reported by Sheldon, but confused with P. angustif alius Berchtold 

 & Presl., and P. amcricanus C. & S. in the University collections, 

 and it is doubtful whether it occurs. 



Potamogeton foliosus Raf. 



Reported in Upham's Catalogue ; no specimens. 



Potamogeton hybridus Michx. 



No specimens ; apparently does not occur, although range given in 

 Gray's Manual implies that it does. 



Ruppia occidentalis Wats. 



Does not occur ; an apparently undescribed var. or subspecies of R. 

 maritima L. from Big Stone Lake in the University collection is 

 erroneously determined as R. occidentalis. 



Najas guadalupcnsis (Spreng.) Morong. 



Reported by Wheeler in Contributions to the Flora of S. E. Minne- 

 sota ; report based on an incorrect determination. 



