

' 



1920] S II ERF F— TARAXACUM 



335 



Alberta: Below and at Ottertail Pass (Rocky Mt. Nat. Park), alt. 6900 ft., 



August 10, 1904, John Macoun (Hb. C 

 Nest Pass, mountain slopes, alt. 7000 



Crow 

 Can. 



Mt., Jasper Park, alpine summits 



1917, /• M. Macoun (Hb. Can. 98682, 98683 and 98684; Hb. Field 483384); 

 Shovel Pass, Jasper Park, high slopes and summits, alt. 7000 ft., August 10, 1918, 



Jasper 



6000 



Hb. Field 483382); Goat Mt., Jasper Park, above tree limit, alt. 7000 ft., 

 July 18, 1918, idem (Hb. Can. 98681; Hb. Field 483383); Mt. Edith Cavell, 

 Jasper Park, damp flat, alt. 6000 ft., idem (Hb. Can. 98690; Hb. Field 483389). 

 Montana: Old Hollowtop, near Pony, July 9, 1897, alt. 9000 ft., Rydberg 

 and Bessey 5294 (Hb. U.S. 361402); above Stanton Lake, alt. 7000-7500 ft., 

 August 1-7, 1804, R. S. Williams 1073 (Hb. Greene 484 u; Hb. U.S. 288^41). 



Wyoming 



July 



mous (Hb. Greene 48456); without locality, F. Tweedy 745 pro parte (Hb. 

 U.S. 41953). 



Colorado: Mt. Hesperus, alt. 11000 ft., July 2, 1898, Baker, Earle } and 

 Tracy 293 (Hb. Field 76097; Hb. Chi. 356356; Hb. U.S. 337212); Saguache 

 (Sawatch) Range, alt. 12000 ft., August 1880, T. S. Brandegee (Hb. Field 

 204736); Uncompahgre River, mountain slopes, alt. 12000-13000 ft., 

 August 1893, C. A. Purpus 719 (Hb. Chi. 357798). * , 



Mts., alt. 3000-3300 m., J 



Can 



Uintah Mts., above Bear River, 



2000 ft., August i860. Sereno Watson 



Nevada: Rocky Mountains, July 20, 1896, Edward L. Greene (Hb. Greene 



48455). 



August 



U.S. 41949). 



Ledebour founded his species upon Asiatic material with 

 immature fruit, collected in stony places upon an alpine summit 

 along the Tschuja River opposite the mouth of the Tschegan 

 River. Several of the specimens from Alaska (for example, 

 Coville and Kearney 1097, Ratter 197) match his description and 

 plate, also specimens of the type collection (legit Bunge, Hb. 

 Boiss.) very closely. Many other Alaskan specimens fail to have 

 the lateral laciniae of the leaves ovate, as described by Ledebour, 

 but acute instead. Here must be placed T. alaskanum Rydb., of 

 which I have examined the type sheet, also the cotype in the 

 Herbarium of the Canadian Geological Survey. Proceeding south 

 from Alaska, forms may be found coming from the high alpine 



