10 MINNESOTA STUDIES IN PLANT SCIENCE 



the continuity of its range with that of S. arguta, and also of S. Nelsoniana, 

 but only as far south as the Selkirks. In general it may be said to occupy 

 the same relative position among the Cuneifoliatad as does S. arguta among 

 the Rotundifoliatae. 



Saxifraga aestivalis F. & M., Ind, Sem. Hort. Petrop, 1 :37. 1835. 

 Micranthes aestivalis (F. & M.) Small, N. Am. Fl. 22:2:147. 1905. 

 A low delicate plant with a thyrsoid inflorescence of delicate branches 

 (Plate IV). 



Distribution. — From the region of Yakutat Bay, Alaska, including the islands 

 along the coast, to the Bitter Root Mountains of Idaho and western Montana, and to 

 the region of Mt. Jefferson in Oregon. 



Specimens examined : 



Alaska: at base of Mt. Tabenkoff, June 22, 1892, F. Fumton No. 40 (MBC 

 84013 ; USNH 423509) ; summit of high mountains, Yes Bay, August 30, 1895, Thos. 

 Howell No. 1622; Kodiak, July 1, 1899, Wm. Trelease No. 4062. 



British Columbia: Asulkan Valley, Glacier, July 26, 1910, F. K. Butters and 

 / E. W. D. Holway No. 584 (UMH) ; swampy places, Cowichan-Alberni Trail, Van- 

 couver Island, June 26, 1906, C. O. Rosendahl No. 1602; stream side, Cameron River 

 Valley, Vancouver Island, June 27, 1907, C. O. Rosendahl No. 1999 (UMH). 

 y Aleerta: Lake Louise, Rocky Mountains, July 19, 1904, Edith M. Farr (MBG 



84418) ; head of Lake Louise, July 30, 1904, John Macoun No. 65312 (UvSNH 529169). 



V/ashington : Olympic Mountains, Clallam County, August, 1900. A. D. E. Elmer 

 No. 2640 (USNH 401936, UMH) ; north fork of Bridge Creek, Okanogan County, 

 September, 1897, A. D. E. Elmer No. 716 (MBG 83922) ; Mt. Rainier, alt. 5,000 ft., 

 September 1, 1913, F, K. Butters (UMH) ; borders of brooks. Goat Mountains, August 

 6, 1895, O. D. Allen No. 198 (UMH, MBG 84518, USNH 314093) ; Baldy Peak, Che- 

 halis County, July 24, 1897, F. H. Lamb No. 1342 (MBG 84516) ; Mt. Rainier, 1906, 

 Mrs. Carpenter No. 37 (MBG 84508) : Paradise Park, Mt. Rainier, alt. 1,500-1,800 m., 

 July 22-30, 1905, M. W. Lyon No. 116 (USNH 529458), as S. aestivalis by Engler and 

 Irmscher; Mt. Rainier, August 15, 1888, C. V. Piper No. 2622 (UMH); Mt. Rainier, 

 alt. 6,000 ft., August, 189, F. C. Smith (MBG 84510) ; Stevens Pass, alt. 4,000-6,000 

 ft., Sandberg and Leiberg (MBG 84124) ; Mt. Paddo, alt. about 2,000 m., July-October, 

 1896-1905, W. N. Suksdorf No. 2504 (MBG 84129, UMH). 



Oregon: at base of Mt. Jefferson, alt. about 6,000 ft., August 25, 1898, F. V. 

 Coville and /. Applegate No. 1176 (USNH 361993), as S. aestivalis by Engler and 

 Irmscher. 



Saxifraga arguta D. Don, Trans. Linn. Soc. 13 :356. 1822. 

 Saxifraga denudata Nutt., mss. (Unverified.) 



Saxifraga punctata acutidentata Engler, Verb. Zool.-Bot. Ver., Wien. 

 19:548. 1869. 



Micranthes arguta (Don) Small, N. Am. Fl. 22:2:146. 1905 (Plate IV). 



• The abbreviation MBG refers to the herbarium of the Missouri Botanical Garden and USNH 

 refers to specimen sheets in the United States National Herbarium. In like manner UMH refers 

 to the herbarium of the University of Minnesota. 



