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Citric acid
Citric acid itself is not corrosive. If a small gulp has been ingested, rinse the mouth.
Clarkia (Clarkia)
The plant is non-toxic.
Clematis (Clematis)
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.
Clitocybe -species (Clitocybe)
Many Clitocybe –species contain muscarine, which cause symptoms in the nervous system. The symptoms usually begin within 30 min-2 hours. Sweating, increased salivation, lacrimation, nausea, vomiting and diarrhea are the typical symptoms.
Ingestion of a small amount (less than 2-3 cubes of sugar) does not require any treatment. If ingested in greater amounts administer activated charcoal and seek medical assistance. Contact the Poison Information Center if someone has ingested Clitocybe -species. Save the mushroom for possible identification afterwards.
Clivia, Bush lily (Clivia)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Clovers (Trifolium)
The plant has been found to cause symptoms associated with poisoning only in animals; in humans the plant can be considered non-toxic.
Club Palm (Cordyline)
The plant is non-toxic.
Clubmoss (Lycopodium)
The plant is non-toxic.
Coconut (Cocos nucifera)
The plant is non-toxic.
Coffee plant (Coffea)
The plant is toxic, but ingesting a small amount rarely causes symptoms.