hemlock
poison hemlock
poison parsley
California fern
Nebraska fern
winter fern
Conium maculatum

Examples of highly toxic herbs include poison hemlock and nightshade.

Opium was used with poison hemlock to put people quickly and painlessly to death, but it was also used in medicine.

Osha leaves have an intense fragrance when bruised and are typically larger than those of poison hemlock.

Considering the high toxicity of poison hemlock, if the plant cannot be identified it must be discarded.

The most dangerous plant which might be confused with fennel is probably hemlock (poison hemlock).

Most Lomatium species have yellow flowers, like fennel, but some are white flowered and closely resemble poison hemlock.

The spotted knapweed and poison hemlock are both under consideration for addition to a high priority watch list maintained by the park system.

"Queen Anne's lace looks very much like poison hemlock," he said.

The one found in naturally infected poison hemlock was only 91% identical to the sequences from Australia.

In use it should not be confused with species of poison hemlock, water hemlock, or baneberry.