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Piper longum L. - Piperaceae - (Indian) long pepper, Langer Pfeffer, Stangenpfeffer

Dioecious climber, several meter long, native to India, Nepal, naturalized and cultivated in Southeast Asia; leaves ovate-oblong to cordtae, acute to acuminate, very finely powdery pubescent; spikes leaf-opposed, male ones 4-5cm × 3mm, female spikes 1.5-2.5cm × 2.5-4mm, 2-3cm in fruit.
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200005574

„Infructescences (reminiscent of catkins) are harvested in various stages of maturity, dried, and traded as long pepper. It is used mainly as spice, but also as remedy in India. Long pepper is about the same as hot as black pepper and owns a slightly sweet and sour taste.“
http://de.wikipedia.org/wiki/Langer_Pfeffer

„Mosquito larvicidal activity of Piper longum fruit-derived materials against the fourth-instar larvae of Aedes aegypti was examined. A crude methanol extract of P. longum fruits was found to be active against the larvae, and the hexane fraction of the methanol extract showed a strong larvicidal activity of 100% mortality. The biologically active component of P. longum fruits was characterized as pipernonaline by spectroscopic analyses. The LC50 value of pipernonaline was 0.25 mg/L. The toxicity of pipernonaline is comparable to that of pirimiphos-methyl as a mosquito larvicide. In tests with available components derived from P. longum, no activity was observed with piperettine, piperine, or piperlongumine.“
[A piperidine amide extracted from Piper longum L. fruit shows activity against Aedes aegypti mosquito larvae., Yang, Y.C., Lee, S.G., Lee, H.K., Kim, M.K., Lee, S.H., Lee, H.S., Journal of agricultural and food chemistry, Vol.50(13), 2002, 3765-3767]