Hitchcock and Cronquist (1973) list heart-leaved buttencup as occurrirg 

 in rrountain rreada.'.'S frcm British Columbia to Alberta and Sasl<atchev.cn, 

 sporadically south to northeast VJashington, and in I'tycming, Utah, l^.-i 

 hfexico and Arizona. The eastern limit of the species in the U.S. is 

 apparently the Dakotas, \vhere it is found infrequently in v.et rreada/.'s 

 and along streams in the Black Hills of South Dakota (Van Bruggen 1976; 

 Dom 1977) and in MxcKenzie County, North Dakota (Great Plains Flora 

 Association 1986). The ta>:on is apparently poorly understood (Welsh et 

 al. 1987) and is similar to R^ inamoenus Greene and R^ pedatifidus 

 Smith. It is considered by Scoggan (1978) to be a variety of R. 

 pedatifidus . Heart- leaved buttercup has been reported for both the 

 Saskatcha-ran and Alberta portions of the Cypress Hills, approximately 

 112 km northeast of the Svjeet Grass Hills (Breitung 1954; de Vries and 

 Bird 1968). To the rorthv?est, Kuijt (1982) lists the species as 

 occurring on rather dry grassy meadot^ra at lcf,-7 elevations in Watertcn 

 Lakes National Park. 



Moss (1959) lists heart-leaved buttercup as ccnmon in moist prairie and 

 mountain rreadows of Alberta, ^vtdle Locman and Best (1979) report the 

 species as unocrrmDn in v.^stem parklands of the Canadian prairie 

 provinces. In the Cypress Hills, it is ccrrmon in grasslands of the 

 plateau (Breitung 1954). 



Habitat affinity for heart-leaved buttercup changes frcm north to 

 south. In the north it is characterized as occurring primarily in 

 mountain iTeadCTv's at lav to mid-elevations (Hitchcock and Cronquist 



