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Mountain Mahogany
Cercocarpus spp.
Mountain Mahogany (Cercocarpus spp.) is a shrub or small tree in the rose family that is toxic to cats due to cyanogenic glycosides — primarily prunasin — found in its leaves. When the leaves are chewed or wilted, prunasin is enzymatically converted to hydrogen cyanide (HCN), which blocks cellular respiration. Wilted or dried leaves are particularly dangerous as the enzymatic conversion proceeds more readily.
Important Notes
Toxic compounds: prunasin (cyanogenic glycoside); wilted leaves most dangerous
Mechanism: prunasin releases HCN via beta-glucosidase, inhibiting cytochrome c oxidase and halting cellular respiration
Symptoms: rapid breathing, weakness, dilated pupils, drooling; severe cases cause seizures, coma, and respiratory failure
Wilted or fallen leaves pose a higher risk than fresh leaves due to accelerated cyanogenic conversion
Seek veterinary care immediately if ingestion is suspected — cyanide toxicity can progress within minutes
Potentially Toxic Parts
Leaf
Seed
Possible Symptoms Reported in Cats
Shock, seizures (convulsions), loss of consciousness, and coma
Neurological · Within minutes to hours
Respiratory distress (panting, gasping for breath, or labored breathing)
Respiratory · Within minutes to hours
Unusually red or pink gums (bright red mucous membranes)
Hematological · Within minutes to hours
Dilated pupils
Neurological · Within minutes to hours
Excessive drooling (hypersalivation)
Gastrointestinal · Within minutes to hours
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.