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Ragged Robin (Lychnis)
The plant is non-toxic.
Rain Lily (Habranthus robustus)
The plant is non-toxic.
Rat poison
In small children, ingesting even a small amount of rat poison is sufficient to cause symptoms. Contact the Poison Information Centre to confirm toxicity.
Red Hot Cat's Tail (Acalypha)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Red campion (Silene dioica)
The plant is non-toxic.
Red hemp-nettle (Galeopsis ladanum)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Red sandspurry (Spergularia rubra)
The plant is non-toxic.
Remo-Wax® ear drops
In small doses, ear drops accidentally administered orally are harmless and do not require special treatment. In the eye: Rinse with plenty of water for about 15 minutes. If symptoms (such as severe pain, swelling, sensitivity to light or tearing) develop during the next hours, take the patient to the doctor.
Rhododendron (Rhododendron)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Rhubarb [K] (Rheum rhaponticum)
The whole plant, and especially the leaves, contain toxic oxalates. Symptoms of poisoning reported include nausea, vomiting, abdominal pain, diarrhea, fatigue, and weakness. Kidney damage is possible.
Stalk: Rhubarb stalks can be used for human consumption in moderation. If large amounts of raw stalks have been ingested and severe abdominal symptoms develop, seek medical attention.
Leaves: If rhubarb leaves have been ingested, contact the Poison Information Center for a risk assessment.