^ 



I 



1920] SI1ERFF— TARAXACUM 



337 



ging from southern Colorado northwestward through British 

 Columbia, Alaska, and barely touching Asia. 3 For T. phymato- 

 carpum he gives a more northern range, extending from Greenland 

 westward through Alaska and slightly into Asia. My own study, 

 however, leaves me entirely unable to maintain such a separation. 

 To do so would necessitate in many instances actually taking 

 materials on the same sheet, collected at the same time and place, 

 and known to be even racially the same, and dividing them arbi- 

 trarily between the two " species," a manifestly absurd and inde- 

 fensible procedure. In this connection it is interesting to note 



Watson 



phy 



carpum Vahl. He stated expressly on the label that his determina- 

 tion was "fide speciminis in Groen. a Rink lecti." Thus Watson 

 likewise was convinced of the identity of the Utah material with 

 that of Greenland. 4 



T. fasciculatum Nels. was described from flowering specimens 

 collected by Alfred A. Griffin (no. in) from Wagon Wheel Gap, 

 Blue Park, Colorado, alt. 11000 ft., July 21, 1912. Nelson has 

 been unable to locate the type specimen for me, but the descrip- 

 tion (" few-several oblanceolate or oblong obtusish merely dentate 

 or denticulate subsessile or short-petioled glabrous leaves 4-7 cm. 

 long"), together with the high altitude recorded, indicates clearly 

 that the plant was 7\ lyratum of the form that, from Greenland, 

 has heretofore been termed T. phymatocarpum. 



Occasionally a form of T. lyratum is found closely simulating 

 the form of T. ceratophorum which Greene described as T. mutilum, 

 and differing clearly from "T. mutilum" only in having black 

 achenes (for example, Walpole 1791 and 1987, Alaska, Hb. U.S. 

 378905 and 379107 respectively; Dr. Murdoch, Alaska, Hb. U.S. 

 424062 and 424064). Its foliage is long linear or linear-lanceolate, 



* 



remotely and very sharply toothed. This form matches very 

 closely the type illustrations of T. hyperboreum Dahlst., from Gjoa 



3 The type of T. lyratum, however, was collected in the interior of Asia! 



4 Elsewhere (U.S. Geo). Explor. Fortieth Parallel 207. 1871) Watson said: 

 "The present specimen, a single one only, is rather larger than those from Greenland, 

 but is plainly the same plant." 



