Felweed
This object can be found in Hellfire Peninsula (113), Nagrand (80), Terokkar Forest (70), Blade's Edge Mountains (67), Shadowmoon Valley (40), Zangarmarsh (28), Netherstorm (10), Coilfang: The Underbog (3), Coilfang: The Steamvault (2) and Coilfang: The Slave Pens (2).