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urtica dioica
From The Collaborative International Dictionary of English v.0.48:
Nettle \Net"tle\, n. [AS. netele; akin to D. netel, G. nessel, OHG. nezz["i]la, nazza, Dan. nelde, n[aum]lde, Sw. n[aum]ssla; cf, Lith. notere.] (Bot.) A plant of the genus Urtica, covered with minute sharp hairs containing a poison that produces a stinging sensation. Urtica gracilis is common in the Northern, and {Urtica chamaedryoides} in the Southern, United States. The common European species, Urtica urens and Urtica dioica, are also found in the Eastern united States. Urtica pilulifera is the Roman nettle of England. [1913 Webster] Note: The term nettle has been given to many plants related to, or to some way resembling, the true nettle; as: Australian nettle, a stinging tree or shrub of the genus Laportea (as Laportea gigas and Laportea moroides); -- also called nettle tree. Bee nettle, Hemp nettle, a species of Galeopsis. See under Hemp. Blind nettle, Dead nettle, a harmless species of Lamium. False nettle (Baehmeria cylindrica), a plant common in the United States, and related to the true nettles. Hedge nettle, a species of Stachys. See under Hedge. Horse nettle (Solanum Carolinense). See under Horse. nettle tree. (a) Same as Hackberry. (b) See Australian nettle (above). Spurge nettle, a stinging American herb of the Spurge family (Jatropha urens). Wood nettle, a plant (Laportea Canadensis) which stings severely, and is related to the true nettles. [1913 Webster] Nettle cloth, a kind of thick cotton stuff, japanned, and used as a substitute for leather for various purposes. Nettle rash (Med.), an eruptive disease resembling the effects of whipping with nettles. Sea nettle (Zool.), a medusa. [1913 Webster]

