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Epilobium parviflorum Schreb. - Onagraceae - hoary willowherb, small-flower willowherb, Kleinblütiges Weidenröschen
Perennial herb, up to 1m tall, native to Europe and Asia, naturalized in Northern America; stems well-branched above, densely gray villous on lower part, mixed above with short glandular hairs; leaves lanceolate-elliptic to narrowly lanceolate or oblong-lanceolate, both surfaces villous; flowers bright pink to dark purple; capsules 3-7cm long, pubescent or rarely glabrescent; seeds dark brown, 0.8-1.1mm, coarsely papillose. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200015087
The aboveground parts of the flowering and fruiting plant (Epilobii herba) are used traditionally in case of urinary problems, specifically complaints resulting from benign prostate hypertrophy. There are phytosterols (up to 0.55%) present like beta-sitosterol and derivatives, which „… may be responsible for the benefits in prostatitis as they can inhibit aromatase, 5-alpha-reductase and the binding of dihydrotestosterone within the prostate… No scientific support is yet available for the traditional use, but the herb (especially myricetin-3-O-beta-D-glucuronide) is known to inhibit prostaglandin formation that would expalin its antiphlogistic activity.“
[Medicinal Plants of the World. Ben-Erik Van Wyk and Michael Wink, Pretoria 2004, 135]
„The ethanolic extract of Epilobium parviflorum showed inhibitory effects on both the COX-1 and COX-2 catalysed prostaglandin biosynthesis, inhibited growth of Escherichia coli and exerted antioxidant activity. Although these results support the traditional use of Epilobium parviflorum for treatment of prostatitis and BPH, further investigation is required…“
[Studies on antibacterial, anti-inflammatory and antioxidant activity of herbal remedies used in the treatment of benign prostatic hyperplasia and prostatitis., Steenkamp, V., Gouws, M.C., Gulumian, M., Elgorashi, E.E., Van Staden, J., Journal of ethnopharmacology, 103(1), 2006, 71-75]
Dietrich, A.G., Flora regni borussici, vol.8, t.572 (1840)
http://plantgenera.org/species.php?id_species=389110