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Cast-iron-plant (Aspidistra elatior)
The plant is non-toxic.
Castor bean (Ricinus communis)
Highly toxic. The whole plant and especially the seeds contain the toxic substance ricin. Typical symptoms include vomiting and diarrhea. Kidney and liver damage has been reported. Whole seeds ingested: no risk of poisoning. If the plant or crushed seeds have been ingested, the patient should seek medical attention.
Catnip [K] (Nepeta)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
[K] = Can be used for human consumption in moderation.
Cattail, Bulrush (Typha)
The plant is non-toxic.
Caucasian rockcress (Arabis caucasica)
The plant is non-toxic.
Cestrum (Cestrum)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Cetirizine
Keywords: Alzyr®, Cetimax®, Cetirizin®, Heinix®, Histec®, Zyrtec®
Ingesting a few tablets or taking a few gulps of cetirizine mixture is not toxic and does not require specific treatment. If the ingested amount is greater, contact the Poison Information Centre to confirm toxicity.
Chalk
Keywords: Crayons, board chalk, wax pastel
A single dose is considered harmless. Does not require treatment.
Chamomile, Mayweed (Matricaria)
The plant causes local irritation. The plant fluid, or sap, can cause local irritation symptoms, such as stinging and burning at the exposure site. Does not absorb into the body. Rinse the exposed area with water.
Cherry (Prunus avium ja Prunus cerasus)
Whole stones ingested: no risk of poisoning. Crushed stones ingested: toxic, but ingesting a small amount rarely causes symptoms.
Other parts of the plant (such as flowers or leaves) are non-toxic.