This article is from the Basic Health Care FAQ, posted to rec.pets.cats newsgroup. Maintained by Cindy Tittle Moore with numerous contributions by others.
* Gives a rash after contact: chrysanthemum; creeping fig; weeping fig; pot mum; spider mum.
* Irritating; the mouth gets swollen; tongue pain; sore lips -- potentially fatal, these plants have large calcium oxalate crystals and when chewed, esophageal swelling may result, resulting in death unless an immediate tracheotomy is done: Arrowhead vine; Boston ivy; caladium; dumbcane (highly fatal); Emerald Duke; heart leaf (philodendrum); Marble Queen; majesty; neththyis; parlor ivy; pathos; red princess; saddle leaf (philodendron); split leaf (philodendron).
* Generally toxic; wide variety of poisons; usually cause vomiting, abdominal pain, cramps; some cause tremors, heart and respiratory and/or kidney problems (difficult for you to interpret): Amaryllis; azalea; bird of paradise; crown of thorns; elephant ears; glocal ivy; heart ivy; ivy; Jerusalem cherry; needlepoint ivy; pot mum; ripple ivy; spider mum; umbrella plant.
 
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