186 



ADDITIONS TO THE FLORA OF THE BLACK 

 HILLS OF SOUTH DAKOTA 



By Stephen Sargent Visker 



During the first half of August, 1908, a collection of about 

 three hundred species of the ferns and flowering plants of the 

 northern Black Hills was made for the State Museum. Upon 

 reference to Saunders' Ferns and Flowering Plants of South 

 Dakota^ and to Rydberg's Flora of the Black Hills ^, it is be- 

 lieved that some eight species are new to the state ; some eight 

 additional new to the Hills, though known from the eastern 

 part of the state ; five are recorded from the northern part of 

 the Hills for the first time, though they were collected near 

 Custer in the southern part ; and five more rare species are men- 

 tioned from new localities in the hills. In the list the species 

 believed to be new to the state are indicated by an asterisk, those 

 known from other parts of the state are followed by (eastern) if 

 from the eastern part, or by (Custer), (Lead), etc., if from other 

 localities in the Hills. 



The collection was identified with the kind assistance of Dr. 

 J. M. Greenman at the Field Museum of Natural History, 

 Chicago. 

 Woodsia scopidina D. C. Eaton. Rocky Mountain Woodsia. 



This fern was found to be quite abundant in protected niches 

 in rocks near Roubaix. (Rare in Black Hills.) 

 Ptevis aquilina L. Bracken fern. 



Locally abundant in woods on Custer's Peak. (Custer.) 

 Eleocharis intermedia (Muhl.) Schultes. Matted spike-rush. 



Common on moist ground near Rapid City. (Eastern.) 



* Scirpus Torreyi Olney. Torrey's bullrush. 



Common in marsh near Roubiax. 



* Juncus balticus Willd. Baltic rush. 



Rare, Rapid City. 

 '^Juncus acwnijiatus Michx. Rush. 

 Rare, in marsh. Rapid City. 



1 D. A. Saunders, Bulletin 64, U. S. Experiment Station, South Dakota. 



2 P. A. Rydberg, Contrib. U. S. Nat. Herb. 3: 463-536. pi. iy-20. 1896. 



