The genus name derives from the Greek words "epi" meaning “upon” and "lobos" meaning “lobe”, with reference to position of the petals above the ovary. The specific Latin name of "parviflorum" means “small flowers”.
The biological form of Epilobium parviflorum is hemicryptophyte scapose, as its overwintering buds are situated just below the soil surface and the floral axis is more or less erect with a few leaves.
Epilobium parviflorum reaches on average 30–80 centimetres (12–31 in) in height. The stem is erect and densely covered with hairs, especially in the lower part. The leaves are opposite, unstalked but not amplexicaul, lanceolate and toothed, rounded at the base, 4–10 centimetres (1.6–3.9 in) long. The tiny flowers are pale pink or pale purple, 6–7 millimetres (0.24–0.28 in) in diameter, with four petals, eight stamens and a 4-lobed stigma. Flowering occurs from June to August. The hermaphroditic flowers are either self-fertilized (autogamy) or pollinated by insects (entomogamy). Fruit is a three-to seven-centimeter long capsule containing very small black seeeds (about 1 mm long), with white fibres that allow the dispersal by wind. This species is quite similar to Epilobium hirsutum, but the flowers are much smaller.
It prefers marshes and swamps, moist mountain meadows and slopes, at an average altitude of 0–1,400 metres (0–4,593 ft) above sea level, with a maximum of 2,500 metres (8,200 ft).
Extracts of this plant have been used by traditional medicine in disorders of the prostate gland, bladder and kidney, having an antioxidant and antiinflammatory effect . Epilobium parviflorum herb has been prescribed internally as tea in the traditional Austrian medicine for treatment of disorders of the prostate, kidneys, and urinary tract. Extracts of Epilobium have been shown to inhibit proliferation of human prostate cells in-vitro by affecting progression of the cell cycle.
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- V. Steenkamp, M. C. Gouws, M. Gulumian, E. E. Elgorashi, J. van Staden (Januar 2006), [PMID 16122891 "Studies on antibacterial, anti-inflammatory and antioxidant activity of herbal remedies used in the treatment of benign prostatic hyperplasia and prostatitis"] (in German), Journal of Ethnopharmacology 103 (1): pp. 71–75, PMID 16122891
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