Ranunculus longirostris

This record represents Ranunculus longirostris in the narrow sense, not including R. subrigidus following Wiegleb et al. (2017) which is accepted in Weakley et al. (2025). In contrast, Kartesz (1994) included R. subrigidus within R. longirostris. Wiegleb et al. (2017) state the following regarding the distribution. "Ranunculus longirostris is widely distributed in North America, in USA from the Rocky Mountains (from Texas to Idaho), the Mississippi valley to the Great Lakes region, and in adjacent areas of Canada. The species shows continental temperate distribution pattern. It is found both in lakes and streams and seems to prefer soft water conditions. Even though there is some overlap in the geographic distribution with the hard water species R. subrigidus, both species are rarely found together in the same site" (Wiegleb et al. 2017).