754 EEPORT OF STATE GEOLOGIST. 



K. obtusiusculus Raf. Water Plantain Spearmint. 



(R. ambigens Wats.) 

 In marshes and at borders of ponds in various parts of the 

 State. Not abundant in any of its stations. 

 Flowers from June until in August. 



Vigo (Blatchley); Jay, Delaware, Randolph, and Wayne (Phin- 

 ney); Jefferson (J. M. Coulter); Noble (Van Gorder); Decatur and 

 Shelby (Ballard). 



R. abortivus L. Kidney-leaved Crowfoot. 



Found abundanty throughout the State in moist grounds in 

 shaded places. It frequently invades well watered lawns becom- 

 ing an annoying weed. Its best development is found in rich 

 soils although it is not uncommon in dry, sterile situations. The 

 form is extremely variable. 



Flower from the middle of March until September or later. 



Jefferson (Barnes); Tippecanoe (Hussey); Vigo and Monroe 

 (Blatchley); Fayette (Hessler); Putnam (MacDougal); Gibson 

 and Posey (Schneck); Kosciusko (Coulter); Daviess (Clements); 

 Clark (Baird and Taylor); Dearborn (Collins); Franklin 

 (Meyncke); Noble (Van Gorder); Jay, Delaware, Randolph, and 

 Wayne (Phinney); Knox (Spillman); Decatur and Shelby (Bal- 

 lard); St. Joseph (Rothert); Hamilton and Marion (Wilson). 



R. micranthus Nutt. Rock Crowfoot. 



($. abortivus micranthus Gray.) 

 In pastures and on hillsides in coarse or sandy soil, or upon 

 rocks. Confined chiefly to southern counties. 

 Flowers from April through August. 



Jay, Delaware, Randolph, and Wayne (Phinney) ; Vigo (Blatch- 

 ley); Franklin (Meyncke); Gibson and Posey (Schneck); Knox 

 (Spillman); Jefferson (J. M. Coulter). 



R. sceleratus L. Ditch Crowfoot. Cursed Crowfoot. 



In swamps and brooks, also along the shores of ditches. Found 

 ' in a few counties, and not abundant in any of its stations. 

 Flowers from April through July. 



Noble (Van Gorder); Cass (Hessler); Vigo (Blatchley); Tippe- 

 canoe; Steuben (Bradner). 



