r 



1920] SHERFF—TARAXACUM 339 



atratis et apicem dilatatum saepe superantibus fere semper 

 instructa, exteriora adpressa vel patentia, late ovata vel lanceo- 



lata, interiorum longitudinis |-f (vel raro to turn) aequantia. 



plerumque 5-15111111. longa, margine decolorato interdum nullo 

 sed saepius praesente et bene distincto. Flores numerosi, magni, 

 foliolis 5-10 mm. longiores, flavi vel sulphurei. Achaenia 4-5 mm. 

 longa, straminea vel brunnea vel griseo-brunnea, supra tuberculis 

 angustis mediocris longitudinis dense obsita et saepe tota rugulosa, 

 in cuspidem crassam vel angustam, brevem vel tertiae parti 

 totius fructus aequantem cuneate attenuata. Rostrum tenue, 

 achaenio paulo vel multo longius. Pappus albus, 5-8 mm. longus. 



Distribution, — Labrador and Alaska southward at higher altitudes to 

 New Hampshire, Massachusetts, Montana, New Mexico, and California; in 

 the entire Arctic region, the mountains of Central Asia, and even "in the 

 Caucasus and in the Alps of Switzerland (a single locality).' ' 



Specimens examined. 6 — Labrador (Peninsula): Northern Labrador 

 along the Ungava River, August 20, 1896, Spreadborough (Hb. Can. 14395); 

 Ungava, Lucien M. Turner 613 (Hb. U.S. 222756). 



Quebec: Banks of the Grand River, Gaspe County, June 30-July 3, 

 1904, M. L. Fernald (Hb. Field 465065; Hb. U.S. 605794); Rimouski County, 

 July 4, 1907, Fernald and Collins 12 10 (Hb. Can. 86493). 



Keewatin: West Coast of Hudson Bay, lat. 56 N., sandy grounds, 

 August, 1886, James M. Macoun (Hb. Can. 15112); Churchill, Hudson Bay, 

 lat. 58 50' N., July 26, 1910, idem (Hb. Cornell Univ.; Hb. Can. 79 286 5 

 Hb. Field 295238; important as matching exactly the form described by 

 Greene for his T. mutilum). 



Manitoba: Birtle, vicinity of, along G.T. Pacif. R.R., June 26, 1906, Macoun 

 and H err tot (Hb. Can. 77046); Forest, six miles east of, along G.T. Pacif. R.R., 

 June 19, 1906, iidem (Hb. Can. 77047); Oak River, along G.T. Pacif. R.R., 

 June 2i, 1906, iidem (Hb. Can. 77048). 



Mackenzie: Cape Barrow (south coast of Coronation Gulf), August 9, 

 1915, Cox and O'Nett 451 (Hb. Can. 98712; Hb. Field 483375); Fort Reso- 

 lution, July 14, 1903, Edward A. Preble 210 (Hb. U.S. 421694). 



6 Many specimens are omitted for lack of space. As representing the extreme 

 form with bracts ecorniculate (7\ lap panic urn), there may be added the following 

 examples: Alberta: Near Old Man's River, damp grassy places, August 4, 1883, 

 Dawson (Hb. Can. 15124). Wyoming: Northwestern part of state, August 9, 1893, 

 /. N. Rose 679 (Hb. U.S. 41951). Utah: Tate Mine, near Marysvale, alt. 9000 ft., 

 Vugust 22, 1894, Marcus E. Jones 5853 (Hb. U.S. 233114); Gold Basin, U Sal Moun- 

 tains, alt. 3000-3300 m., July 11, 1911, Rydberg and G<irrdt 8836 (Hb. U.S. 765101). 

 California: Bear Valley, San Bernardino Mountains, in meadows, August, 1882, 

 S.B. and \\\ F. Parish 1461 (Hb. Field 208755; Hb. 1 S. 783095); Bear Valley, 

 San Bernardino Mts., alt. 6500 ft., June 18, 1894, S. B. Parish 3131 (Hb. U.S. 214378). 



