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.
Not all Narcissus flowers are yellow, although perhaps yellow is the classic color for "daffodils." The picture shows a white type called Narcissus 'Ice Follies.' Learn all about daffodils here: http://landscaping.about.com/od/floweringbulbs/p/daffodils.htm
It can be difficult to determine which plants will pair well together. Thankfully, we have helpful hints to solve that problem. Try mixing herbs or shrubs with your flowers, or even vegetables with your florals! Roses and hydrangeas each pair well with many flowers. Consider the shape and color of blooms and foliage. Lastly, when in doubt, stay simple and classic in your pairings.