270 CONTKIBUTIONS FROM THE NATIONAL HERBAEIUM. 



2346,493; Mabton, Cohort 321; Rockland, SwA-sf/or/ 1959; Rock Creek, Piper 2790; Coulee 

 City, Piper 3875; Rock Lake, Sandberg cfc Leiberg 112; Spokane, Piper 2283; Plangman 

 Creek, Sandberg cfe Leiberg 3; Waverly, Suksdorf, 2342; Pullman, Elmer 184; Piper 1459. 

 Zonal distribution: Arid Transition. 



2. Myosurus minimus L. Sp. PI. 1: 284. 17.53. 

 Type locality: Eluropean. 



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

 Specimens examined: West Klickitat County, Sul'sdorf23H. 



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

 Type locality: Siskyou County, California. 



Specimens examined: Coupeville, Gardner 11; Clallam County, Elmer 2674; Stuart 

 Island, Lawrence 77. 



Zonal ulstribution : Humid Transition. 



BATRACHIUM. 



1. Batrachium aquatile (L.) Wimm. Fl. Schles. 8. 1841. Water crowfoot. 



Ranunculus aquatilis L. Sp. PI. 1: 5.56. 1753. 



Type locality: Europe. 



Range: Alaska to California. Europe. Asia. 



Specimens examined: Oyhni, Lamb 1261; Tacoma, LocJcenby, May, 1898; Fleii, May 9, 

 1895; White Salmon, SuJcsdorf; Rock Creek, Sandberg dc Leiberg 90: Walia Walla region, 

 Brandegee 606; Pullman, Elmer 841; Hull 409; Falcon Valley, Sulcsdorf 1960. 



Zonal distribution: Transition to Canadian. 



la. Batrachium aquatile pantothrix (Brot.). 



Ranunculus pantothru: Brot. Fl. Lusit. 3: 375. 1804. 



Ranunculus aquaiilis tnchophyllus A. Gray, Man ed. 5, 40. 1867. 



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



Type locality: "Circa Conimbricam" in Lusitania. 



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



Specimens examined: San Juan Island, Lyall in 1858; Cascade Mountains, latitude 

 49°, Lyall in 1859; Parker, 'Dunn, August 8, 1901; Cascade ^fountains to CoWxWe , Lyall in 

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

 220; Marshall Junction, Piper; Box Canyon, Kreager 395; Chewelah, .S'reaf/er 528; Pend 

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



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

 Ranunculus faccidus Pers. or Batrachium faccidum (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; Waitsburg, Horner 41. 



RANUNCULUS. Buttercup. 



Plants aquatic or subaquatic; leaves hiiely dissected when 

 submersed, less so when aerial. 



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

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



