conium

‖n. [ NL., fr. Gr. &unr_; hemlock. ] 1. (Bot.) A genus of biennial, poisonous, white-flowered, umbelliferous plants, bearing ribbed fruit (“seeds”) and decompound leaves. [ 1913 Webster ]

2. (Med.) The common hemlock (Conium maculatum, poison hemlock, spotted hemlock, poison parsley), a roadside weed of Europe, Asia, and America, cultivated in the United States for medicinal purpose. It is an active poison. The leaves and fruit are used in medicine. [ 1913 Webster ]