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Part of stem, leaf and umbel of Poison-Hemlock.

Poison Hemlock

Part of stem, leaf and umbel of Poison-Hemlock.

Umbel of Poison-Hemlock.

Poison Hemlock

Umbel of Poison-Hemlock.

Magnified flower of Poison-Hemlock.

Poison Hemlock

Magnified flower of Poison-Hemlock.

Magnified fruit of Poison-Hemlock.

Poison Hemlock

Magnified fruit of Poison-Hemlock.

Magnified fruit of Poison-Hemlock, cut in half.

Poison Hemlock

Magnified fruit of Poison-Hemlock, cut in half.

Hemlock is a genus of poisonous plants. It has a tall, hollow stem and white flowers.

Poisonous Hemlock

Hemlock is a genus of poisonous plants. It has a tall, hollow stem and white flowers.

Poison-ivy, a climbing or trailing shrub with variable three-foliate leaves, aerial rootlets and greenish flowers.

Poison Ivy

Poison-ivy, a climbing or trailing shrub with variable three-foliate leaves, aerial rootlets and greenish…

Poison oak plant differs from poison ivy mainly in the character of its leaflets, which are somewhat thicker and smaller and less lobed.

Poison Oak

Poison oak plant differs from poison ivy mainly in the character of its leaflets, which are somewhat…