Oxalate plants contain sharp, tiny crystals in their juices, leaves and stems, called calcium oxalate crystals. Oxalate crystals can cause intense pain and swelling if they come in contact with the skin or mouth.

When any part of these plants is chewed and swallowed, the crystals stab the sensitive tissues of the tongue, gums and throat, creating the sensation of biting into ground glass. Pain, difficulty swallowing, swelling and temporary hoarseness may occur.

Poisoning from swallowing an oxalate-containing plant is rare because the intense mouth pain usually prevents children from eating a significant quantity of the plant.

If a child eats any part of an oxalate-containing plant, wipe out the residue of the plant from the mouth and offer a cool drink or snack such as a popsicle, applesauce or yogurt. If there is swelling that prevents the child taking anything by mouth or causes difficulty breathing, go to the nearest emergency department immediately.

When the juices of the plant come in contact with the skin, burning, pain and swelling may occur. Lather the exposed area repeatedly with soap and rinse with warm running water to ease the irritation. If the pain continues, contact your child's physician.

Examples of plants that contain oxalates include:

Caladium

Calla Lily

Devil's Ivy

Dieffenbachia (Dumb Cane)

Elephant's Ear