32 MINNESOTA STUDIES IN PLANT SCIENCE 



The following specimens from the Selkirks and the Canadian Rockies 

 are similar to the Montana plants. 



Alberta : Laggan, Rocky Mountains, alt. 7,000 ft., F. K. Butters (UMH) ; 

 Canadian Rockies, F. K. Butters, No. 262 (UMH) ; Canadian Rockies, F. K. Butters, 

 No. 281 (UMH). 



British Columbia: Cougar Valley, alt. 6,500 ft., on limestone ledges, F. K. But- 

 ters, No. 340 (UMH) ; Cougar Valley, 5,500 ft., F. K. Butters, No. 363 (UMH) ; 

 Avalanche Crest, Selkirks, alt. 7,200 ft., F. K. Butters, No. 401 (UMH) ; Mt. Cheops, 

 alt. 8.000 ft., July 18, 1908, Butters and Holway, No. 347 (UMH). 



Nelson's type specimens of this species are much more slender and 

 delicate plants than the others enumerated above, probably due to the 

 peculiar conditions under which they were found growing, but the coinci- 

 dence of geographical distribution and the close similarity in floral and 

 vegetative characteristics leave little doubt that they are all S. saximontana 

 E. Nelson. The isolated outposts in the Black Hills and in the Wallowa 

 Mountains of Oregon seem rather remotely connected, but it is exceedingly 

 difficult to detect any differences in the plants except in the minutest details. 

 The cotype material of S. saximontana shows more orbicular petals, broader 

 and ciliolate sepals, lanceolate rather than linear bracts, and more multi- 

 cellular glands on the hairs in some cases, but the same variations are to be 

 found in other specimens. 



The specimens referred to Saxifraga Allenii (Small), Engl, and Irmsch. 

 by Engler and Irmscher are erroneously determined inasmuch as the 

 leaves of this particular species are distinctly crenately toothed and the 

 inflorescence thyrsoid. When placed side by side the plants aire obviously 

 different. 



Saxifraga tennesseensis Small, Bull. Torr. Bot. Club 23 :364. 1896. 



Micranthes tennesseensis Small, Fl. S.E.U.S., 501. 1903. 



A plant of characteristically stout habit (Plate VII). 



Distribution. — Along the Tennessee River in the vicinity of Knoxville, Tennessee. 



Specimens examined : 



Tennessee: Knoxville, May, 1898, Albert Ruth (MBG 84397, 84120); April to 

 May, 1897, MBG 84398; April, 1896, MBG 84396; April, 1895, 34120; April, 1895, MBG 

 84128; April, 1894, MBG 84290, UMH; Knoxville, May 5, 1895, /. G. Smith (MBG 

 34348, 84576). 



North Carolina: moist rocks, slopes of Craggy Mountain, Buncombe County, 

 May 18, 1898, Biltmore Herbarium, No. 5651a (MBG 84333). 



Saxifraga virginiensis Michx., Fl. Bor. Am. 1 :269. 1803. 

 Saxifraga vernalis Willd., Hort. Berol. 43. 1805. (Unverified.) 

 Saxifraga virginica Nutt., Gen. 1 :285. 1818. 



Saxifraga pilosa Banks; D. Don. Trans. Linn. Soc. 13:386. 1822, as syn. 

 (Unverified.) 



