Known only from small portions of two drainage systems in southeastern Minnesota where there are fourteen known sites harboring fewer than 400 genetic individuals. Because the species only reproduces vegetatively, dispersal beyond the immediate vicinity of established plants is limited to occasional uprooting by floodwaters. This geographically restricted trout lily is one of only two plant species endemic to Minnesota. Most sites are inside state scientific and natural areas, public parks, and private preserves, or are being protected voluntarily by private landowners.
Successional changes in habitat threaten this shade intolerant herb. Other threats include:
Agricultural activities and development
Trampling due to human foot traffic
At the time of listing, 14 sites of 1 to 3 acres each were known. (USFWS 1986a)
Thomas Morley has investigated apparent hybrids between Erythronium albidum and E. propullans. (Morley 1993)
Two sites are owned by The Nature Conservancy, both of which are being managed for the specie's benefit. (USFWS 1985b)
A boardwalk was constructed at one State Park where this species is found to allow visitors to observe the rare lily without disturbing it. (Sather 1990)
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