Dictamnus albus commonly called Gas Plant. While in bloom, it emits a citrusy, flammable oil that briefly ignites when exposed to flame. It's completely harmless to the plant, but incredibly fun. I have Everything about Cement Production Golden Euonymus Bold Variegated Shrub for Year Round Color Garden Delight Center houseplants What are the brown spots on the leaves of this plant, is it dangerous and how can I treat it? Gardening & Landscaping Stack Exchange