270 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



2346,493; Mabton, Cotton 321 ; Rockland, 5w)t«for/* 1959; Rock Creek, Piper 2790; Coulee 

 City, Piper 3875; Rock Lake, Sandberg d^ Leiherg 112; Spokane, Piper 2283; Hangman 

 Creek, Sandberg cfc Leiherg 3; Waverly, Suksdorf, 2342; Pullman, Elmer 184; Piper 1459. 

 Zonal distribution: Arid Transition. 



2. Myosxirus minimus L. Sp. PI. 1: 284. 1753. 

 TirE locality: European. 



Range: Washington and California to Illinois and Florida. Europe. 

 Specimens examined: West Klickitat County, Switsdor/" 2344. 



3. Myosurus major Greene, Pittonia, 3: 257. 1898. 

 Typk i.<hai.ity: Siskyou County, California. 



Specimen.s e.xamined: Coupeville, Gardner 11; Clallam County, Elmer 2674; Stuart 

 Island, Laurence 77. 

 Zonal disthibution : Humid Transition. 



BATRACHIUM. 



1. Batrachium aquatdle (L.) Winiiii. Kl. Scliles. 8. 1841. Water cRownxrv. 



KanunciUuti aqualUis L. Sp. PI. 1: 556. 1753. 



Type ixk:ality: Europe. 



Range: Alaska to California. Europe. Asia. 



Specimens examined: Oylnit, L^im/> 1261; Tacoma, Lockenby, May, 1898; Flett, May 9, 

 1895; White Salmon, Suksdorf; Rock Creek, Sandberg <& Leiberg 90; Walla Walla region, 

 Brandegee 606; Pullman, Elmer 841; Hua 409; Falcon Valley, Suksdorf \m). 



Zonal distribution: Transition to Canadian. 



la. Batrachium aquatile pantothrix (Brot.). 



Ranunculus jHtntot/trix Brot. Fl. Lusit. 2: 375. 1804. 



Ranunculus aquatilis trichophyllus A. Gray, Man ed. 5, 40. 1867. 



Ranunculus trichophyllus Chaix.; Vill. Fl. Dauph. 1: 335. 1786, nom. nud. 



Type locality: "Circa Conimbricam" in Lusitania. 



Range: Alaska to Nova Scotia, south to California and Tennessee. Europe. Asia. 



Specimens examined: San Juan Island, Lyall in 1858; Ca.scade Mountains, latitude 

 49°, Lyall in 1859; Parker, Dunn, August 8, 1901 ; Cascade Mountains to Colville, Lyall in 

 1860; Crab and Wilson creeks, Sandberg cfc Leiberg 265; Harrington, Sandberg cfe Leiberg 

 220; Marshall Junction, Piper; Box Canyon, Kreager 395; Chewelah, ifrcagrer 528; Pend 

 Oreille River, Lyall in 1861 ; Pullman, HxM 410. 



The form in flowing streams usually has longer and more flaccid leaf-segments. It is 

 Ranunculus flacddus Pers. or Batrachium flaccidum (Pers.) Rupr. and is probably worthy 

 of recognition as a subspecies. 



lb. Batrachium aquatile caespitosum. (DC.) 

 Ranunculus aquatilis caespitosus DC. Prod. 1 : 26. 1824. 

 Type locality: None given. 

 Range: Same as of B. aquatile. 

 Specimens examined: Spokane, Piper 2633, 2943; Waitsbui^, JfforTicr 41. 



RANUNCULUS. Buttercup. 



Plants aquatic or subaquatic ; leaves finely dissected when 

 submersed, less so when aerial. 



Akenes corky margined; flowers 15 to 25 mm. broad. 1. R. delphinif alius. 

 Akenes marginless; flowers 7 to 15 mm. broad 2. R. purshii. 



