72 FLORA OF GRAND RAPIDS. 



574. R. ACRis L. Tall Crowfoot or Uuttorcup. 

 In waste places. June. 



{Scattered along the railroads soutli of the City: C. & W. M. and 

 L. S. & M. S. (K. E. :Mattt'S(>n); D. G. K. & W. Ry. at First 

 Ave. (O.Ii); North Park Street Railway, near Sweet St., City. 

 Recently introduced. 



575. R. circinatus Sibth. Stiff Water-Crowfoot. 

 JBatrachiuin divuricaturn (Schrank) Wimm. 



Frequent in shallow water. June-Oct. 



57(i. R. fascicularis Muhl. Early Crowfoot. 

 In dry sandy soil. Mid-April-May. 

 Common east and soutli of the City. 



577. R. multifidus Pursh. Yellow Water-Crowfoot. 

 It. ihlpliinifolius Torr. 



In ponds and slow streams; becoming infrequent. Mid-April-May. 

 Perennial by rooting from the nodes of floating stems after 

 flowering. 



578. R. multifidus terrestris Gray. 

 Muddy banks of pools; rare. 



In May, 1891, plants were collected a little south of Plaster 

 Creek, just west of Madison Ave. (Edward Raiguel). 

 No herbarium specimen. 



579. R. Pennsylvanicus L. f. Bristly Crowfoot. 



Marshes and wet places along streams; frequent. July-Aug. 



580. R. recurvatus Poir. Hooked Crow^foot. 

 Rich woods and ravines; frequent. May-June, 



581. R. sceleratus L. Cursed Crowfoot. 



Swamps, ditches, and low ground; common and variable. Last 

 of May- June. 



582. R. septentrionalis Poir. 



Moist soil; frequent and variable. May-June. 



