Epilobium lactiflorum Hausskn.
Habitat: Margins of rills and alpine areas.
Range: Circumboreal, south to Maine, northern New Hampshire, northern New York, and the Rocky Mountains.
Aids to Identification: Epilobium lactiflorum is similar to E. hornemanni, but has shorter flower petals that are white versus pale purple.
Phenology: Flowers July to August.
Synonyms: Epilobium alpinum var. lactiflorum (Hausskn.) C.L. Hitchc.; Epilobium hornemanii Reichenb. var. lactiflorum D. Löve
Known Distribution in Maine: There are no documented occurrences of Epilobium lactiflorum in Maine, though M.L. Fernald notes it from Mt. Katahdin (as Epilobium alpinum L.).