Narcissus: Also Known as a daffodil. It means new beginnings and will ensure happiness. It is used during ten year anniversaries. The narcissus became popular in Europe after the 16th century. It has been used for medical purposes but if ingested it could be poisonous.
The Narcissus plant is known for the most frequent causes of accidental poisoning, however the symptoms are not severe. The whole plant is poisonous, but the bulb especialy, and poisoning often occurs due to people mistaking the bulb for an onion.
narcissus - Google Search - "December's birth flower is the narcissus which embodies the idea that you want your beloved to stay just the way they are." http://www.almanac.com/content/birth-month-flowers-and-their-meanings