2l6 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Horkelia Gordonii Hook. Journ. Bot. & Kew Misc. 5 : 341 [Rydb. 



Men. 151] ; Ivesia GordoniiToxx. & Gray, Pac. R. R. Rep. 6: 



72 [Man. R. U. 86: Bot. Cal. i: 183]. 



Horkelia and Ivesia have been distinguished by two characters, 

 viz., dilated filaments and numerous pistils in Horkelia and filiform 

 filaments and few pistils in Ivesia. These distinctions do not hold, 

 however, as there are species in both genera which have dilated 

 stamens and few pistils ; it is, therefore, best to regard them as one 

 genus. Horkelia Gordonii \s a subalpine plant, growing at an alti- 

 tude of 2000-3000 m. 



Montana: Bridger Mountains, June 14-15, 1897, Rydberg & 

 Bessey, 434-g and 4351; Northern Montana, 1883, F. IV. Ander- 

 son; Gallatin Co., Mrs. Alderson ; Boulder Creek, 1883, Scribner, 



45^- 



Yellowstone Park: 1884, Tzueedy, pj ; Stinking Water, 



1873, C. C. Parry, p6. 



Idaho: Mt. Chauvet, July 29, 1897, Rydberg c£- Bessey, 4330. 



Argentina Anserina (L.) Rydberg, Mem, Dept. Bot. Columbia 

 Univ. 2: 159; Potentilla Anserina L. Sp. PI. 495? Torr. & 

 Gray, Fl. N. Am. i : 444 [Man. R. M. 86; 111. Fl. 2 : 216; Bot. 

 Cal. i: 180]. 



Argentina differs from Potentilla in the lateral style, the amphi- 

 tropous, ascending ovules and the general habit. The genus was 

 first separated by Lamarck in 1778, and was accepted by a subgenus 

 by Torrey and Gray in 1840. A. Anserina grows in w^et places, up 

 to an altitude of perhaps 2500 m. 



Montana: Lewis & Clarke Co., Mrs. Math; Great Falls, 

 1892, R. S. Williams, 660. 



Yellowstone Park : 1884, Tzveedy, gg (a very slender, small- 

 leaved and small-fiowered form, with narrowly obovate petals, grow- 

 ing in brackish soil) ; 1885, 466. 



* Argentina Anserina grandis (Torr. & Gray) Rydb. Mem. Dept. 



Bot. Columbia Univ. 2 : 161 ; Potentilla Anserina grandis Torr. 



& Gray, Fl. N. Am. i : 444. 



Leaves 3-4 dm. long, erect, the leaflets and flowers larger than in 

 the species. 



Montana: East Gallatin Swamps, 1896, Plod/nan, 380; 1854, 

 Hay den ^ 130. 



