Nymphs; Echo & Narcissus
Review Packet 3 Mythology
By Dr. Melissa Schons Bishop, Boston Latin School
Find lots of information under the Homework Help section of Mythman.com
Nymphs and Echo & Narcissus on www.pantheon.org.  Excellent overviews of myth and its purpose in antiquity. 
For a more in-depth approach to the mythology, try Parada's web page, Bulfinch's or Characters of Greek Mythology - all accessible at the Lenape Latin Mythology page.
Bulfinch's Version - Scroll down to "Echo & Narcissus"
Flowers in Mythology
Flowers in Greek Mythology
Flowers & Gods - short, but interesting, and nice graphics
Legends of the Flowers - Detailed, excellent graphics, covers only about 6-7 flowers