Upright perennial, branching near top, or single stemmed. Leaves lanceolate, opposite, toothed, glabrous, sessile, measured to 6.5 cm long to 3 cm wide. Flowers are pink to white in colour, 7 mm in diameter, with four cleft petals, and found at stem tips. Blooming begins in July.
Common. Habitat is sloughs, stream sides, and other wet places across the prairies, parkland, and boreal forest.
How to distinguish it from other species of Epilobium: flowers less than 12 mm diameter, plants are perennial, leaves toothed and lanceolate in shape.
Height listed in Budd's Flora to 100 cm, height of plant in above photo to 60 cm.
Photo taken July 11th, swamp with beaver dams, Cypress Hills, 450 km south west of our home in Regina, SK.
Naming (2007): Plants of the Western Boreal Forest and Aspen Parkland lists this plant as E. glandulosum. The Integrated Taxonomic Information System, and Checklist of the Vascular Plants of Saskatchewan both list Epilobium ciliatum as the accepted name, with subspecies E. ciliatum ssp. glandulosum.