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Polypodium vulgare L. Polypody. Among rocks, rare in 

 Montana. Collected by the writer near Flathead Lake and at 

 McDonald. Collected also at Columbia Falls by R. S. Williams. 



MARSILIACEAE. 



Marsilia vestita Hook, and Grev. Shallow water, reported as 

 rare. This species has been collected by Geyer on the upper 

 Missouri, by Williams on the Lower Sand Coulee, and by Watson 

 on the Big Blackfoot. 



EQUISETACEAE. 



Equisetum variegatum Schleich. Collected by the writer along 

 the sandy shore of the upper end of Swan Lake, infrequent. 

 Collected along the Flathead river by R. S. Williams. 



Equisetum scirpoides Michx. Collected at Columbia Falls by 

 R. S. Williams. 



Equisetum laevigatum Schleich. Common in meadows in the 

 western half of Montana. 



Equisetum robustum A. Br. Collected at West Gallatin by 

 W. T. Shaw. 



Equisetum fluviatile L. Collected at Columbia Falls by R. S. 

 Williams. 



Equisetum arvense L. Damp soil, infrequent. Collected in 

 Lewis and Clark counties by Mrs. Muth ; at Upper Sand Coulee 

 by R. S. Williams, and at Grizzly Creek by Mr. Tweedy. 



Equisetum arvense campestre Milde. This variety has been 

 collected at Cedar Mountain by Rydberg and Bessey. 



SELAGINELLACEAE. 

 Selaginella densa Rydberg. On gravel and exposed rocks, 

 forming patches of considerable area. Common in the moun- 

 tainous regions of Montana. The writer found this species 

 ranging from the water's edge of Flathead Lake to the summit 

 of the highest peaks. 



LYCOPODIACEAE. 



Lycopodium annotinum L. The writer collected this species 

 in fruit near Belton along the road leading to Lake McDonald, 

 August 15, 1902. It was associated with Lycopodium complana- 

 tum L. In this locality the species was common. Collected also 

 at Lake Terry [McDonald] by R, 3, Williams, 



