*Marsh Marigold (Caltha palustris)
*In early spring, the young greens of this bright yellow perennial are edible when cooked.
*However, steer clear of them the rest of the year. When ingested, the toxin found in the rounded, heart-shaped leaves causes burning of the throat, bloody diarrhea, fainting, and convulsions.
* Marsh marigold grows in mountainous areas of the West Coast, the Mid-Atlantic, and in New England.