Epilobium hornemannii Rchb.

Much like no. 11 [Epilobium alpinum L.], but coarser and more nearly erect, to 4(5) dm, the stem usually not sigmoid, the lvs 1.5–4.5 cm, entire or often toothed, the erect frs 3.5–5.5(–7.5) cm, slender, often only ca 1 mm thick, or to 1.5 mm; 2n=36. Streambanks and other wet places, with us at upper elev. in the mts.; circumboreal, s. to Me., n. N.H., n. N.Y., and the Rocky Mts. June–Aug. Two ecogeographically coextensive vars. Var. hornemannii has anthocyanic pet 5–8 mm; var. lactiflorum (Hausskn.) D. Löve, has white to ochroleucous pet 2.5–5 mm. (E. lactiflorum)