Felweed
This object can be found in Hellfire Peninsula (226), Nagrand (160), Terokkar Forest (140), Blade's Edge Mountains (134), Shadowmoon Valley (80), Zangarmarsh (56), Netherstorm (20), Tempest Keep: The Botanica (6), Coilfang: The Underbog (3), Coilfang: The Steamvault (2) and Coilfang: The Slave Pens (2).