MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 169 



and flaccid, but not as long as in the preceding. In streams, at an 

 altitude of 2500 m. 



Yellowstone Park : Fire Hole River, near Lone Star Geyser, 

 Aug. 7, 1897, Rydbcrg & Bcssey, 4134; 1883, Miss Mary Compton. 



*Batrachium caespitosum (DC.) F. Schultz, Arch. Fl. Fr. & All. 



I : 71 ; Ranunculus aqiiatilis cacsfitosus DC. Prod. I : 26 [Syn. 



Fl. i^: 21]. 



Dwarf; leaves small, orbicular in outline, the segments somewhat 

 fleshy, short and rather broad. 



Montana: Northern Montana, 1883, Canby, 8. 



Oxygraphis Cymbalaria (Pursh) Prantl ; Engl. & Prantl, Nat. Pfl. 



Fam.3-: 63 [111. Fl. 2: 86] ; Ranunculus Cymbalaria Pursh, Fl. 



Am. Sept. 392 [Syn. Fl. i' : 23 ; Man. R. M. 6 : Bot. Cal. 1:7]. 



In wet, more or less alkaline soil, up to an altitude of about 

 2000 m. 



Montana : Jack Creek Canon, July 15, 1897, Rydberg & Besscy, 

 4132; BridgerMts., June 10, 4i32y2\ Fridley, 1887, Tweedy, ig8 ; 

 Great Falls, 1891, R. S. Williams, 326; Sheridan, 1892, Edith 

 Virden; Gallatin Co., Mrs. Alderson; Bozeman, 1892, W. T. Shazv ; 

 Custer Co., 1892, 3frs. Light; West Gallatin, 1883, Scribner, 4d. 



Yellowstone Park : Mammoth Hot Springs, 1889, F. W. 

 Dezuart. 



*Thalictrum venulosum Trelease, Proc. Bost. Soc. Nat. Hist. 23: 



302 [Syn. Fl. i': 16: 111. Fl. 2: 88]. 



Resembles somewhat T. Fcndleri in habit, but is distinguished 

 by the strong reticulation of the leaves, and by the achenes which are 

 only slightly flattened and have comparatively firm walls. It is a 

 plant of lower altitudes, scarcely reaching 2000 m. 



Montana: East Gallatin Swamps, iS^6, Flodman, 483; Boze- 

 man, 1895, Rydberg, 263 j. 



Thalictrum occidentale Gray, Proc. x\m. Acad. 8 : 372 [Syn. Fl. 



i^: 16; Man. R. M. 5 ; Bot. Cal. i: 4 and 2 : 425]. 



Common in valleys and open woods, up to an altitude of 2500 m. 



Montana: Electric Peak, Aug. 20, 1897, Rydbcrg & Bessey, 

 413Q; Spanish Basin, iS^6, Flodman, 482; Little Belt Ui^., 483 ; 

 Bridger Mts., 484; Bozeman, 1895, Rydberg, 2636; Gallatin Peak, 

 1886, F. Tzveedy, 1061; Nobleville, 1892, J/;;5. Noble; Bozeman 

 Creek, 1892, W. T. Shazv; Lewis and Clarke Co., vJ/r^. i^/?^///; 



