JOHNSON: A REVISION OF THE SECTION BORAPHILA 33 



Dermasea pilosa Haw. Saxifr. Enum., 9. 1821. (Unverified.) 



Dermasea elongata Haw., I.e. (Unverified.) 



A polymorphic species. Several rather distinct forms have been found 

 which differ considerably in carpel and seed characters, but the exact status 

 of which can not be determined at this time. Examination of Michaux's type 

 specimens is necessary. The range of this species is peculiar and there 

 appears to be some marked differences between the northern and the south- 

 em forms. The Minnesota specimens are without flowers and fruit so that 

 their nature can not be learned and must await further collecting. The 

 specimens from Missouri show certain characters which may prove suffi- 

 ciently distinct to warrant setting them apart as distinct species (Plate IX). 



Dr. Fernald (8) has described several forms of this species from 

 Massachusetts and New York. He notes that several aberrant forms of 

 S. virginiensis occur. In attempting to distinguish between S. nivalis and 

 S. virginiensis, however, Dr. Fernald dwells on unimportant vegetative 

 and floral characters, whereas the outstanding differences between these two 

 species which are to be found in the carpels, gland, and receptacle, receive 

 no notice. 



Distribution. — New Brunswick and Quebec to northern Minnesota; in the South, 

 westward to Missouri. 



Specimens examined: 



Minnesota: exposed rocks. Two Harbors, May, 1891, /. H. Sandherg (UMH) ; 

 rocky slopes of Pelican Lake, August 30, 1909, C. O. Rosendahl (UMH) ; Flag 

 Island, Lake of the Woods, August 10, 1894, MacMillan and Sheldon,. No. 2836. 



Ontario: Kingston, May 7, 1881, /. Fowler (MBG 84353) ; Kingston, Jones Falls, 

 May 21, 1881, /. Fowler (MBG 84354) ; Kingston, May 30, 1901, /. Fowler (MBG 

 84568) ; Sparta, May 14, 1899, G. E. Fisher, J. Macoim (MBG 84347). 



Michigan: Isle Royal at Tobin's Harbor, August, 190O, W. A. Wheeler ("716 

 and 722"). 



Ohio: rocks, Hinckley, June 1, 1894, /. R. Watson (UMH). 



New York: Ithaca, April 30, 1891, Herman Schrenk (MBG 84371); Sullivan 

 County, 1873, Eggett (MBG 84263) ; East Greenwich, 1861, Dr. Asa Fitch, No. 

 2419 (UMH). 



Pennsylvania: Rawlinsville, 1884, Eggert (MBG 84366); along Conestoga 

 Creek, Lancaster County, April 12, 1889, /. K, Small (UMH) ; Allegheny County, 

 April 28, 1892, Adolph Koenig (UMH) ; Rawlinsville, ex herbarium, James Galen 

 (UMH) ; Safe Harbor, Lancaster County, April, 1893, Heller and Halbach, No. 804 

 (UMH) ; Glen Rock, York County, May 30, 1895, N. N. Glotfelter, M.D. (MBG 

 84352) ; rocks, Robinson's Knoll, near Philadelphia, April 25, 1872, Redfield, No. 2021 

 (MBG 84357) ; Conestoga, May, 1887 (no collector cited), (MBG 84596) ; Swarth- 

 more, 1891, /. M. Greenman, No. 62L (MBG 737966) ; Westmoreland County, April 

 16, 1878, B. E. Pierron, No. 73 (MBG 777399) ; Mt. Alto, 1900, Jos. Illick (MBG 

 84070) ; on the Conestoga, Lancaster County, April 24, 1893, Heller and Halbach, No. 

 804 (MBG 84378) ; rocky places, Milford, May 15, 1905, C. A. Mill (MBG 84374) ; 

 banks of Conestoga Creek, May, 1894, A. F. Eby (MBG 84066) ; near Philadelphia, 

 1889, /. M. Greenman, No. 628 (MBG 738696) ; ex Bernhardi Herbarium, Philadelphia 



