MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 209 



Coulter describes it as " erect or weak and ascending." It is 

 never as far as I know perfectly erect, but generally rather diffusely 

 branched. The erect specimens that Dr. Coulter had in view must 

 belong to the next species, which has been confused with it. P. 

 Ieiicoca?-pa grows in light rather damp soil, on prairies and river- 

 bottoms. It is a rather rare plant in the region. 



Montana: Helena, 1892, J^. D. Kelsey. 

 *Potentilla biennis Greene, Fl. Fran, i: 65 [Rydb. Mon. 44]; 



Potent ilia later ijlora Rydberg, Bull. Torr. Bot. Club, 23: 261. 



In habit it most resembles the following species, but is a much more 

 slender plant, with a small falsely racemose inflorescence. It differs 

 from P. leucocarpa in the erect subsimple stems, the broader leaf- 

 lets, the inflorescence and the more glandular-puberulent stem. 



In rich soil, at an altitude of 1000-2000 m. 



Montana: Cliff Lake, July 27, 1897, Rydberg & Bessey, 4.372; 

 Pony Mts., July 7,7^7/; Melrose, 1895, Rydberg^ 2686; Bozeman, 

 1887, Tzceedy, 16; Helena, 1882, Canby. 

 Potentilla Monspeliensis L. Sp. PI. 499 [111. Fl. i: 212; Rydb. 



Mon. 45] ; Potentilla JVof'vegica Bigelow, Fl. Bost. 125 [Man. R. 



M. 83] ; not L. 



It is rather common in rich or sandy moist soil, reaching an alti-. 

 tude of about 2500 m. 



Montana: Pony, July 6, 1897, Rydberg cf- Bessey, 4367; Cliff 

 Lake, July 27, 436S ; Jack Creek, July 15, 436^; Silver Bow Co., 

 Mrs. Moore; Helena, 1892, Kelsey. 



Yellowstone Park: Shoshone Lake, Aug. 10, 1897, Rydberg 

 & Bessey, 4370; Yellowstone Lake, 1884, Tweedy, 100. 

 Potentilla concinna Richards. Frankl. ist Journ. 739 [Rydb. Mon. 



52] : Potentilla hiiniifiisa Nutt. Gen. i : 310 [Torr. & Gray, Fl. 



N. Am. i: 443; Man. R. M. 85]. 



A species belonging to the plains region, reaching an altitude of 

 perhaps 2000 m. 



Montana: Bozeman, 1892, W. T. Shaw. 



Potentilla concinna divisa Rydberg, Bull. Torr. Bot. Club, 23: 431 

 [Rydb. Mon. 53] ; Potentilla nivea dissecta Wats. Proc. Am. 

 Acad. 8: 559, in part [Man. R. M. 85, in part]. 

 The Montana and Black Hills specimens, referred by Watson to his 



variety of P. nivea, belong to a form of P. concinna, which can 



easily be seen from the broad sepals and bractlets. 



