34 8 BOTANICAL GAZETTE [November 



Alaska: Vicinity of Port Clarence, gravel flats near beach, Teller Rein- 

 deer Station, September 3, 1901, F. A. Walpole 1980 (Hb. U.S. 379098). 



British Columbia: Kicking Horse Lake, Rocky Mountains, springy 

 places, July 20, 1885, John Macoun (Hb. Can. 15128; Hb. Field 227895). 



Montana: Sheridan, in 1892, Mrs. L. A. Fitch (Hb. Mont. Agric. Exper. 

 Sta.; type); Anaconda, mountain swales, alt. 6000 ft., May 20, 1906, /. W. 

 Blankinship 723 (Hb. Can. 73794; Hb. Field 225568; Hb. U.S. 541188). 



Wyoming: Dale Creek, July 1, 1896, Edward L. Greene (Hb. Greene 

 48449, 48450, and 48451; the three type sheets of T. angustifolium Greene); 

 Pole Creek, June 2, 1894, Aven Nelson 109 (Hb. U.S.. 284425); Horse Creek, 

 June 9, 1894, idem 205 (Hb. Field 432099; Hb. U.S. 284424); Sand Creek, 

 Albany Co., May 31-June 1, 1900, idem 6987 (Hb. Greene 48427, type of 

 T. ammophilum Nelson ex Greene; Hb. U.S. 433375); Sand Creek, Albany 

 Co., June 1, 1900, idem 6988 ex parte (Hb. U.S. 433376), 



The specimens originally distributed by Nelson (no. 6987) as 

 r. ammophilum are rather small, averaging mostly under 1 dm. in 

 height, and are of a pallid, somewhat glaucous appearance. Their 

 achenes, when mature, are distinctly reddish, as in T. laevigatum. 

 The involucral bracts are almost entirely without dilations at the 

 apex. Except for the achenes, the plants match perfectly some 

 plants considered by Handel-Mazzetti as T. lapponicum Kihlm., 

 but regarded by myself as a form or variety of T. ceratophorum. 

 They are in no way referable to the European T. laevigatum, as 

 suspected by Handel-Mazzetti (loc. cit. no), who appears never 

 to have seen Nelson's specimens. 



Some of the material examined is darker green, but otherwise 

 identical. Blankinship 723 from Montana, consisting mostly 

 of immature specimens, is an example of this. The Blankinship 

 plants are particularly instructive, further, in showing the aspect 

 of immature and dwarfed plants. Some of these (for example, 

 Hb. Field 225568) match exactly Rydberg's three tiny immature 

 type specimens of T. eriophorum (in Hb. Mont. Agric. Exper. 

 Sta.). 20 Rydberg did not describe the achenes, since there were 

 no mature ones present. 21 The immature achenes of the Blankin- 

 ship collection are brown, as in Rydberg's type material, but the 



20 Blan kinship's plants were collected at Anaconda, a distance of only 55 miles 

 (90 km.) from Sheridan, whence the type of T. eriophorum came. 



21 The name eriophorum alluded to the brown hairs found on the small type 

 plants, but this character is entirely inconstant in this species and has no real taxonomic 

 value. 



