The Collaborative International Dictionary of English v.0.48:
Sowbane \Sow"bane`\, n. (Bot.) The red goosefoot (Chenopodium rubrum), -- said to be fatal to swine. [1913 Webster]WordNet (r) 3.0 (2006):
sowbane n 1: herb considered fatal to swine [syn: sowbane, red goosefoot, Chenopodium hybridum]