32 THE BIOLOGY OP HARDING COUNTY 



III. LIST OF PLANTS OF HARDING COUNTY, NORTH- 

 WESTERN SOUTH DAKOTA.* 



Collected by S. S. Visher, determined by Aven Nelson, 

 i. OPHIOGLO'SSACEAE (Adder's-tongue Family) 



i. Boirychinm virginianum (L) Sw. 

 Rare in the forested buttes. 



2. POLYPODIACEAE (Fern Family) 



2.. Dryopteris FilLi'-mas (L) Schott. Shield Fern. 

 Rare in deep narrow gorge, Cave Hills. 



3. FilLv fragilis (L) Underw. Brittle Fern. 



Fairly abundant in deep shady ravines. 



4. Pellaea atropnrpurca (L) Link.? Cliff Brake. 



Rare in crevices in rocks, Lodge Pole Butte. 



5. Woodsia scopulina (DC) Eat. 



Abundant, growing in tuffs on exposed rocks about the 

 buttes. 



3. MARSILEACEAE 

 *6. Marsilia mucronata R. Br. "Four-leaved-clover." 



Very abundant in waterholes, especially conspicuous after 



these holes go dry. 

 7. Marsilia vestita. Hook & Grev. 



Abundant on muddy bottoms if intermittent creeks. 



*The plants were collected, chiefly during July, August and the first 

 week of September, 1910 and 1912. During June, 1911, most of the 

 country was visited and some 90 numbers obtained. W. H. Over, formerly 

 of Date, collected 16 additional species June 1-15, and a small collection 

 by B. B. Rowley of the 1909 survey party adds 18 species. In addition 

 29 species are inserted, bracketted, in the list. F. D. Fromme collected 

 about 200 species during" the summer of 1910 and identified them, chiefly 

 by manuals, the following winter. Of these 200 some 29 are additions to 

 my list of plants as identified by Nelson. Over one hundred and fifty of 

 the following 467 species are not seemingly mentioned in any way in 

 Saunder's Catalog; and about one hundred and twenty, marked with an 

 asterisk, are added to the total known flora of South Dakota by these 

 collections. 



A bibliography of the Flora of South Dakota flora. 



(1) Rydberg P. H. Flora of the Black Hills, Contrib. U. S. Nat. Herb. 

 3:463-536. 



(2) Flora of South Dakota, Bull 64, U. S. Experiment Station, Brookings, 

 S. D. 1899. 



(3)S. S. Visher additions to the Flora of the Black Hills, 



I. Torreya IX, pp. 186-188 1909, 9 additions. 



II. Muhlenbergia VIII 12, pp. 135-7 1912, 13 additions. 



III. Muhlenbergia IX 1, pp. 33-39 1913, 31 additions. 



(4) S. S. Visher Plants of the Pine Ridge Reservation Bull 5 S. D. Geol. 

 and Biol. Survey, pp 84-108, 1912, 96 Additions. 



(5) S. S. Visher "Additions to the Flora of S. D." I. Muhlenbergia p. 

 45-52, 1913. A revised list of the additions to the state based on 

 the Pine Ridge collections. Also includes two species of Carex, not 

 in Bull. 5. 



