Any of several poisonous herbaceous plants of the parsley family, especially Conium maculatum, believed to be the plant that killed Socrates. It is now common in the U.S. as well as in Europe. A tall biennial, this plant has green stems spotted with red or purple, large compound leaves, and white flowers. Though the poison is concentrated in the seeds, the entire plant is dangerous to livestock when fresh. Despite their common name, poison hemlocks are not conifers (see hemlock). Water hemlocks (Cicuta species) are similar and also dangerous.
Learn more about poison hemlock with a free trial on Britannica.com.
Any of 10 species of coniferous evergreen trees that make up the genus Tsuga, in the pine family, native to North America and central and eastern Asia. Some are important timber trees, and many are popular ornamentals. Other plants commonly called hemlock include ground hemlock (see yew) and poison hemlock and water hemlock (parsley family). A true hemlock is a tall, pyramidal tree with purplish or reddish-brown bark, slender horizontal or drooping branches, and short, blunt leaves that grow from woody cushionlike structures on the twigs.
Learn more about hemlock with a free trial on Britannica.com.
The word hemlock may refer to:
Hemlock Semiconductor Joint Ventures to Invest up to $3.0 Billion to Expand Polysilicon Production for the Solar and Electronics Industries.
Dec 31, 2008; The hemlock Semiconductor group, which includes two Dow Corning Corporation joint ventures, hemlock Semiconductor...