Epilobium parviflorum is a perennial herb to 80 cm, erect, densely hairy, branched.
Leaves opposite, alternate above, 2-8 cm long, hairy on both sides, narrow, sessile but not clasping stem, margin toothed.
Flowers red-purple ca. 1 cm wide, pet 4, deeply notched, 0.4-0.9 cm long.
Fruit dry, a linear capsule 5-8 cm long.
Wetland status: NL
Frequency in NYC: Very infrequent.
Habitat: Found in both wet, open soil and in dry soil.