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Rosary pea, Paternoster pea (Abrus precatorius)
Highly toxic. The whole plant and especially the seeds contain the toxic substance abrin. Typical symptoms include vomiting and diarrhea, followed by drowsiness, confusion, hallucinations, changes in the level of consciousness, and convulsions. Kidney and liver damage has been reported. If the plant has been ingested, the patient should seek medical attention.
Rose (Rosa)
The plant is non-toxic.
Rosemary (Rosmarinus officinalis)
The plant is non-toxic.
Rowan, Mountain-ash (Sorbus)
The plant causes local irritation.
Raw berries: Monitoring at home is sufficient. If more symptoms develop, including severe vomiting, seek medical attention.
Cooked berries are non-toxic and edible.
Rubber fig, Rubber plant (Ficus elastica)
The plant is non-toxic.
Ryegrass (Lolium)
The plant is toxic, but ingesting a small amount rarely causes symptoms.