I like to plant in my aunts garden but I do not know anything about Narcissus... think you can help?
Yes, Narcissus is a spring plant you would most recognize as a daffodil
Oh! And what colours do they come in?
Typically yellow, white but can also come in orange or pink in garden varieties
I would love one in pink! What else do you know about these beautiful creatures?
The Narcissus was known in ancient times as a medicinal plant. 
Ohhhh and to which cause?
Taxonomy of Narcissus
The taxonomy of "Narcissus" is complex, and still not fully resolved. Known to the ancients, the genus name appears in Graeco-Roman literature, although their interest was as much medicinal as botanical. It is unclear which species the ancients were familiar with. Although frequently mentioned in Mediaeval and Renaissance texts it was not formally described till the work of Linnaeus in 1753. By 1789 it had been grouped into a family (Narcissi) but shortly thereafter this was renamed Amaryllideae, from which comes the
Narcissus (plant)
Narcissus is a genus of predominantly spring perennial plants of the amaryllis family, Amaryllidaceae. Various common names including daffodil, daffadowndilly, narcissus and jonquil are used to describe all or some members of the genus. "Narcissus" has conspicuous flowers with six petal-like tepals surmounted by a cup- or trumpet-shaped corona. The flowers are generally white or yellow (also orange or pink in garden varieties), with either uniform or contrasting coloured tepals and corona.
"Narcissus" were well known