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Henbane, Black Henbane (Hyoscyamus niger)
Highly toxic. The whole plant contains toxic alkaloids, such as atropine and scopolamine, which cause anticholinergic symptoms. Typical symptoms include dryness of the mouth, dilated pupils, tachycardia, hallucinations, altered level of consciousness, and convulsions. If the plant has been ingested, the patient should seek medical attention.
Herbicide
Keywords: glyphosate
The content varies. Contact the Poison Information Centre to confirm toxicity.
Hesperis (Hesperis)
The plant is non-toxic.
Hibiscuses (Hibiscus)
The plant is non-toxic.
Hops (Humulus)
The plant is non-toxic.
Horse chestnut (Aesculus)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Horsetail (Equisetum)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hortensia (Hydrangea)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hound's-tongue (Cynoglossum officinale)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hyacinth (Hyacinthus orientalis)
The plant is toxic, but ingesting a small amount rarely causes symptoms.