[wikipedia] Description, Distribution, Habitat: Epilobium ciliatum, known by the common names fringed willowherb,[1] American willowherb,[2] slender willow herb, and northern willow herb is a species of flowering plant in the willowherb family Onagraceae. This species is native to much of North America, southern South America, and East Asia. It is an introduced species in much of Eurasia and Australia.[3] Subspecies Three subspecies are currently recognized: Epilobium ciliatum ssp. ciliatum [6][7] Epilobium ciliatum ssp. glandulosum (Lehm.) Hoch & P.H.Raven [8][9] Epilobium ciliatum ssp. watsonii (Barbey) Hoch & P.H.Raven[10][11] The three currently recognized subspecies may each constitute a distinct species. If so, E. ciliatum ssp. watsonii would perhaps use the name E. adenocaulon and include those populations, while E. ciliatum ssp. glandulosum would perhaps use the name E. bergianum and include those populations. The others named E. ciliatum ssp. ciliatum populations would remain. (link added by Mary Ann Machi)