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Homalomena Selby / Homalomena rubescens
Homalomena Selby
Homalomena ‘Selby’ is a tropical ornamental houseplant in the Araceae family, making it toxic to cats for the same reason as Dieffenbachia, Philodendron, and Pothos: insoluble calcium oxalate crystals (raphides) throughout the leaves and stems. When chewed, these needle-like crystals are forcefully ejected into the oral mucosa, causing intense immediate irritation.
Important Notes
Toxic compounds: insoluble calcium oxalate raphides; the plant’s cell sap also contains proteolytic enzymes
Mechanism: crystal penetration of the mouth and throat lining causes mechanical burning and inflammation
Symptoms: sudden oral pain, intense drooling, pawing at mouth, swollen lips or tongue, difficulty swallowing, vomiting
All parts of the plant are hazardous; the reaction is immediate and self-limiting
Rinse the mouth with water; seek veterinary care if swallowing is impaired or symptoms do not resolve
Potentially Toxic Parts
Root
Stem
Leaf
Entire Plant
Possible Symptoms Reported in Cats
Mouth Irritation (Pain/Burning)
Gastrointestinal · Immediate (Upon chewing the plant material).
Drooling (Hypersalivation)
Gastrointestinal · Immediate.
Vomiting
Gastrointestinal · Acute.
Reluctance to Eat / Difficulty Swallowing
Gastrointestinal · Acute.
Diarrhea
Gastrointestinal · Delayed (Following ingestion of larger quantities).
Lethargy
Neurological · Acute/Delayed.
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.