Toxicodendron

• poison ash

  Smooth American swamp shrub with pinnate leaves and greenish flowers followed by greenish...

• poison ivy

  Climbing plant common in eastern and central United States with ternate leaves and greenish...

• western poison oak

  Poisonous shrub of the Pacific coast of North America that causes a rash on ...

• eastern poison oak

  Poisonous shrub of southeastern United States causing a rash on contact.

• Japanese varnish tree

  Small Asiatic tree yielding a toxic exudate from which lacquer is obtaine...

Cicuta

• water hemlock

  Tall erect highly poisonous Eurasiatic perennial herb locally abundant in marshy ...

• spotted cowbane

  Tall biennial water hemlock of northeastern North America having purple-spotted...

Oenanthe

• water dropwort

  European poisonous herb having tuberous roots, yellow juice that stains the skin,...

• water fennel

  European poisonous herb with fibrous roots.

Also contains

• hellebore

  Any plant of the Eurasian genus Helleborus.

• dogbane

  Any of several poisonous perennial plants of the genus Apocynum having acrid milky juice...

• baneberry

  A plant of the genus Actaea having acrid poisonous berries.

• aconite

  Any of various usually poisonous plants of the genus Aconitum having tuberous roots and...

• fool's parsley

  European weed naturalized in America that resembles parsley but causes nausea and...

• gloriosa

  Any plant of the genus Gloriosa of tropical Africa and Asia; a perennial herb climbing...

• hemlock

  Large branching biennial herb native to Eurasia and Africa and adventive in North America...

• waxberry

  Deciduous shrub of western North America having spikes of pink flowers followed by round...

• oleander

  An ornamental but poisonous flowering shrub having narrow evergreen leaves and clusters...

• American holly

  An evergreen tree.

• lantana

  A flowering shrub.