poison hemlock

American  

noun

1. hemlock.

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poison hemlock British  

noun

1. the US name for hemlock

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Etymology

Origin of poison hemlock

An Americanism dating back to 1810–20

Example Sentences

Beware of the poison hemlock, an invasive weed so toxic it can be lethal, King County officials say.

From Seattle Times

They are targeting Johnson grass, giant foxtail, Canada thistle, nodding thistle, common teasel, multiflora rose, Amur honeysuckle, poison hemlock, marestail, Japanese knotweed and kudzu.

From Washington Times

The clusters are poison hemlock, a noxious weed that, as its name suggests, is toxic to people and animals.

From Seattle Times

The treatments will target Johnson grass, giant foxtail, Canada thistle, poison hemlock, Japanese knotweed, kudzu and others.

From Washington Times

It is hard to grasp that the carrot family would include some of the most malevolent plants on earth, including poison hemlock.

From Washington Post