"Trollius laxus" is a rare, herbaceous perennial only found in a small range of fens or wetland habitats fed by groundwater in northeastern United States. In these calcium rich fens, the "T. laxus" can be locally abundant. They can also be found in Oregon, Washington, British Colombia and the Rocky Mountains of Colorado. During spring, "T. laxus" is one of the first flowers to bloom in the Rocky Mountain. Its distribution is limited by light intensity and hydrology. 